Frequently Asked Questions
Drapery Cleaning - The Basics
How should I clean my curtains?
The right answer depends on fabric type, lining, age, and whether the drapes have been flame-retardant treated. Many manufacturers label drapes "dry clean only" because washing can cause shrinkage, but conventional dry cleaning still uses liquid solvents that can distort delicate fabrics and remove flame-retardant treatment. On-Site uses a dry powder process designed specifically for commercial draperies - no water or liquid solvent at any stage.
Which drapes can be washed safely?
Curtains made of synthetic fibers can be washed in cold water and air-dried, but that is not a safe general rule for commercial drapery. Natural fibers, lined drapes, blackout drapes, stage velours, and flame-treated fabrics should not be washed. Drapery will shrink 5-10% when washed - for a 20-foot-tall stage drape, that means it comes back one foot shorter. If flame retardant has been applied, a single wash removes the treatment and leaves the drapes out of compliance.
What about natural fiber drapes - cotton, wool, linen?
Unlike clothing, most drapery fabric is not designed to be washed. Washing natural fiber draperies causes fabric damage, shrinkage, and significantly shortens their lifespan. Only the On-Site non-immersion process can guarantee no shrinkage and no fabric damage on these materials.
How do I clean silk drapes?
Do not get silk drapes wet. Gentle vacuuming can remove surface dust, consult with your local dry cleaner if stained.
How about blinds - verticals, horizontals, roller shades, silhouettes?
Some blinds can be wiped down regularly to remove dust. Other fabric-style blinds cannot be wiped down as it simply grinds the soil deeper into the material. For fabric blinds, contact a blind specialist who uses ultrasonic cleaning technology. Contact us if you need a referral.
How often should commercial drapes be cleaned?
That depends on your facility type. The cleaning schedule followed by the majority of our clients:
Once a year: Hotels, Hospitals, Restaurants, Banquet Halls, Nursing Homes
Once every three years: Golf Courses, Universities, Funeral Homes, Retirement Homes, Resorts
Once every three to five years (with flameproofing renewal): Theaters and SchoolsNote: any facility where flame retardant has been applied should plan cleaning on a three-year cycle to stay current with fire code compliance requirements.
Why should I clean my drapes?
All drapes, curtains, and blinds act as passive air filters, continuously absorbing airborne pollutants, dust, and allergens due to constant airflow through a building. This creates a fertile environment for dust mites and other organisms linked to infectious disease transmission. Embedded dirt and moisture combine with sunlight to produce dry rot. Fumes from furnaces, fireplaces, and food odors contain airborne chemicals that oxidize and form mild acids inside the fabric, attacking fibers from within. Even drapes that appear clean require regular professional cleaning to preserve fabric integrity and prolong their service life.
Why should drapes be professionally cleaned if they don’t look dirty?
Drapes act like passive air filters, continuously trapping combustible dust deep in their fiber structure long before they look visibly dirty. Multiple degradation processes work invisibly: fabrics continuously absorb and release moisture, leaching flame-retardant chemicals over time; dust accumulation coats FR compounds, reducing their effectiveness; stage lighting and UV exposure degrade fiber chemistry; and oils from skin and food become food sources for mold and bacteria that consume both fabric fibers and FR compounds. A drape can look pristine while its flame retardant has been reduced to a fraction of its original effectiveness. Visual inspection alone cannot confirm compliance.
What happens if I don’t clean my drapes regularly?
Fabric degradation accelerates significantly without regular cleaning. Drapes that could last 15-20 years with proper maintenance may need replacement in five. Dust mites and other organisms colonize heavily soiled drapery. In flame-treated drapes, soiled fabric also loses the ability to properly accept re-treatment, undermining fire code compliance. Regular cleaning is cost-effective drapery asset management.
How do I remove allergens from my drapes? How do clean drapes improve indoor air quality?
All drapes, curtains, and blinds act as filters, absorbing airborne pollutants, dust, and allergens due to constant airflow. Professional drapery cleaning removes embedded dust and allergens and can have an immediate positive impact on indoor air quality. This is particularly important in schools, healthcare facilities, and long-term care environments.
Can you remove odors from drapes?
Yes. Drapes absorb airborne odors from cooking, smoke, furnaces, and HVAC systems. These compounds oxidize over time and create persistent smells that routine airing cannot eliminate. Our non-immersion cleaning process extracts embedded odor compounds along with dirt and dust. Clients consistently report a clean, fresh result after service.
How much does commercial drapery cleaning cost?
Cost depends on the number of panels, fabric type, overall size, and whether flameproofing re-treatment is required. On-Site provides free on-site estimates. Because our process takes down, cleans, and re-hangs drapes in a single day - and can include flameproofing in the same visit - clients avoid the cost and disruption of managing multiple vendors.
The On-Site Cleaning Process
What is On-Site’s cleaning process?
It is a non-immersion cleaning process - no water, no solvents, no liquids of any kind. Drapes are removed from their hardware and placed in our custom-built extra-large cleaning drum. The drum rotates 10 seconds in one direction, stops, then 10 seconds in the opposite direction - this bi-directional action gently agitates the cleaning powder through the fabric without tangling or binding the drapes, preserving the pleat structure. A powerful blower motor then creates 3,000 cubic feet per minute of suction - 30 times the suction of a standard vacuum - extracting the powder along with all bound dust, dirt, and contaminants. No water or liquid solvent is used at any stage.
Why is a dry process important?
Most drapery problems begin with liquids: shrinkage, lining separation, watermarking, dye bleed, puckering, and flame-retardant loss. Non-immersion cleaning machines for drapes were originally developed in the 1940s specifically to provide a safe cleaning solution for delicate textiles that cannot sustain liquid exposure. A dry process avoids all of those risks. That is why On-Site is the only drapery cleaning company that can guarantee - in writing - no shrinkage and no fabric damage.
How is the On-Site process different from competitors?
Most competitors use wet methods - spray chemicals, steam, or conventional dry cleaning solvents - that damage delicate fabrics, cause shrinkage, and strip flame retardant. Some take drapes away for days. Our non-immersion process cleans without liquids, preserves existing flame retardant, and completes everything - take-down, cleaning, flameproofing, and re-hang - in a single day at your facility. Our drum is also the largest in the business, which means drapes are never crammed in: traditional cleaners use much smaller drums, producing excessive wrinkling and patchy cleaning results.
Do you clean drapes while they are still hanging?
No. Drapes cannot be thoroughly cleaned while hanging. The heaviest dust buildup is at the top, in the pleats, and in folds not accessible from the front. Without removing drapes, thorough cleaning is simply not possible. On-Site removes the panels, cleans them in our mobile unit, and re-hangs them the same day.
Should we take the drapes down before On-Site arrives?
No. It is better for On-Site to handle take-down and re-hang. Our technicians document the curtain layout, replace missing hooks at no charge, and ensure everything goes back in the correct order and configuration.
How long does the cleaning take?
The cleaning cycle involves a 20-minute agitation cycle followed by 40 minutes of forced-air extraction. Most commercial jobs are scheduled so drapes are taken down, cleaned, and re-hung the same day. Large schools, theatres, hotels, or multi-building projects may be phased by area.
Does the process leave a chemical smell or residue?
No. Independent laboratory testing confirmed our process leaves no traces of toxic residue in the fabric and no toxins in the air of treated rooms. The process leaves drapes clean, dry, and ready for immediate use.
Is On-Site’s cleaning process environmentally friendly?
Yes - and compared to conventional dry cleaners still using perchloroethylene (PERC), the difference is significant. Our process uses no water and no toxic dry cleaning fluids, so there is nothing harmful to dispose of. The environmental savings are quantifiable: On-Site’s process saves approximately 120,000 gallons of hot water annually and prevents 40,000 gallons of perchloroethylene toxic dry cleaning fluid from being disposed of each year. Our waste residue is completely non-toxic and leaves no trace of toxins on treated drapes.
Can cleaning and flameproofing be completed in the same visit?
Yes - this is the standard On-Site service model. FR-treated drapes must be re-treated after every cleaning, because any liquid-based cleaning removes topical flame retardant. Only our non-immersion process cleans without stripping existing treatment. Cleaning must happen first because dirty fabric does not accept flame-retardant treatment evenly. Once drapes are re-hung, flame retardant is applied as an even spray. Drapes then need to remain undisturbed for 24 hours to allow the treatment to fully cure. We re-test treated samples to verify effectiveness.
Can I ship my drapes to On-Site instead of having technicians come to me?
Yes. In addition to our standard on-site service where our mobile units come to your facility, we offer a self-service option for customers who prefer to send their drapes to us. We will clean, re-certify, and return them promptly. For most theaters and schools, the on-site same-day option is more practical since curtains cannot be out of service for extended periods.
What if my drapes need repairs during the same visit?
On-Site technicians bring an industrial-grade sewing machine and grommet machine on the truck. Minor repairs - torn hems, missing grommets, loose seams, hook replacements, small tears - can be completed on-site during the cleaning visit. A stitch in time saves nine: addressing small damage during a scheduled service call prevents costly replacement later.
How do you protect drapes from shrinkage, fading, and colour bleeding?
All three risks come from the same source: liquid exposure. Drapery fabrics are not pre-washed like clothing, so when fibers are exposed to water or dry cleaning fluid, they shrink considerably. Dyes bleed when immersed - colours that look crisp will run and fade. Our non-immersion process uses no liquids of any kind, which is why On-Site is the only drapery cleaning company that can guarantee - in writing - no shrinkage, no colour fade, no dye bleed, and no distortion of pleats and seams.
How do you safely clean blackout-style drapes?
Improperly cleaned blackout drapes develop tiny holes that let light through, and you will notice pulls at the seams where the face fabric and blackout liner shrink at different rates. Our process was originally developed specifically to clean blackout drapes for major hotel chains and remains the only safe method for cleaning blackout drapes without damaging the blackout liner. We guarantee it.
What can I expect when I contact On-Site for the first time?
Send your contact details and a few photos of your facility using our website contact form. An account manager will send you a quote form within 24 hours - fill it in with dimensions and panel counts and send it back, and you will receive a detailed quotation within 24 hours. Once approved, we coordinate a mutually convenient service date. On service day, our licensed technicians arrive with the mobile cleaning truck, take down your drapes, clean them, re-hang them, and apply flame retardant. Drapes must remain undisturbed for 24 hours while the treatment cures. We then take fabric samples to re-test and verify the treatment passed. Once the invoice is settled, we issue your Certificate of Flame Retardant Application and Testing.
Flameproofing and Fire Code Compliance
What does it mean to flameproof drapes or curtains?
Flameproofing - also called flame retardant treatment or fire retardant treatment - means applying a chemical compound to fabric that causes it to self-extinguish rather than continue burning when exposed to an ignition source. Treated fabric chars at the point of contact but does not propagate flame, buying critical time for occupants to evacuate and for fire suppression to activate. Flame retardants work by creating a thermal barrier between the combustible fabric and the flame source.
Is flameproofing drapes required by law?
Yes, in most commercial and public assembly settings. Building and fire codes - including NFPA 101 (Life Safety Code) and local fire marshal requirements - mandate that drapes and curtains in public assembly spaces, lobbies, exits, corridors, and healthcare facilities must be flame resistant. The typical threshold is any room with an occupant load exceeding 100 persons, but requirements vary by jurisdiction. Contact your local fire marshal or Authority Having Jurisdiction (AHJ) to confirm the specific requirements for your building.
What does AHJ mean?
AHJ stands for Authority Having Jurisdiction - usually the fire marshal, building department, or local inspector who has authority over fire-code enforcement at your facility. The AHJ always has final authority. There is no single national fire code in the United States; requirements are a patchwork administered at the state level, or in the case of New York City and Boston, by municipality. Most reference NFPA standards, but California adds TB-119 and Title 19. Some states use older NFPA code editions; some school districts or individual venues have set their own standards.
Which materials need to be flame resistant?
The requirement is broader than most facility managers realize. Common items include: curtains and drapes in assembly occupancies; stage curtains and theater backdrops; wall coverings and decorative fabric displays; upholstered furniture in public spaces; artificial plants and foliage; tablecloths and linens in hospitality settings; costumes and uniforms in performance venues; netting and soundproofing fabric; tent and awning fabric used at events; and trade show booth fabric and displays. If you are unsure whether a specific material in your facility requires treatment, contact On-Site or your local fire marshal.
What facilities are required to have flameproofed drapes?
Any commercial facility with public assembly areas should assume flame-resistant drapery is required. This includes: schools, colleges, and universities (particularly auditoriums, gymnasiums, and stage areas); theaters and performing arts centers; hotels, resorts, and banquet halls; hospitals and long-term care homes; restaurants with dining rooms over 100 occupants; places of worship; government and military facilities; museums and convention centers; and golf and country clubs with event spaces.
Do FR-treated drapes and IFR drapes have different maintenance requirements?
Yes, and this distinction is important. FR drapes (topically treated) must be re-certified every 3 years and must be re-treated after every cleaning - any liquid-based cleaning removes the treatment. Only non-immersion cleaning can clean FR drapes without stripping their protection. IFR drapes (inherently flame retardant) do not lose their FR properties through normal cleaning - the resistance is built into the fiber. However, accumulated dust is flammable, and even IFR drapes can fail a field test when heavily dust-laden. IFR drapes should be professionally cleaned every 3 years to remove that combustible dust layer. Annual NFPA 705 field testing is recommended for both types. The key practical difference: FR drapes require cleaning plus re-treatment; IFR drapes require cleaning only. Older IFR drapes may still require re-treatment after cleaning if they fail NFPA 705 after cleaning.
How long does flame retardant treatment last?
Typically three to five years under normal conditions, provided the drapes are not cleaned with water or liquid solvents in the interim. New York and California require annual testing with re-treatment every three years; most other jurisdictions require testing every three to five years. If laundered or conventionally dry cleaned even once, the flame retardant is completely removed and must be re-applied before the drapes are returned to service.
Does washing drapes remove the flame retardant?
Yes. Flame retardant chemicals are water-soluble - they behave chemically like salt. Cleaning drapes in a laundry or with conventional dry cleaning solvents will remove the treatment, sometimes in a single cycle. If drapes are washed, dry-cleaned, or even exposed to sustained moisture, the flame retardant can be entirely removed and will no longer provide protection.
Our drapes have a certificate, but it is over three years old. Are we still compliant?
Probably not. A certificate more than 3 years old should be treated as expired and trigger re-testing via an NFPA 705 field flame test. Flame retardant degrades continuously - through dust accumulation, humidity, UV exposure, and normal use - so a certificate only reflects the condition of the fabric on the date of testing. Additionally, any rips, tears, or unfinished edges that have developed since the last treatment increase flammability regardless of FR status: loose threads burn easily and a drape with rips or unsewn hems is more likely to fail a field test. Repair damage before re-treatment.
How do I know if my drapes have been flameproofed?
The best evidence is a Certificate of Flame Retardant Application and Testing from the company that performed the treatment, showing the date of service. Without a certificate, compliance cannot be verified. A fire inspector may perform or require a field flame test. On-Site issues certificates after every flameproofing service and can perform field testing for facilities that need to verify the current status of their drapes.
What is a Certificate of Flame Retardant Application?
A written record issued after flame retardant has been applied to fabric, confirming the date of treatment, the facility and drapes treated, and the standard against which the treatment was tested. A complete certificate should clearly identify the fabric type (FR or IFR) and the test standard used - confirm the standard matches your jurisdiction, since NFPA 701, CA Title 19, NYC Administrative Code, BFD IX-1, and CAN/ULC S-109 are not interchangeable. Fire marshals and insurance inspectors commonly require these certificates as proof of compliance.
Do drapes need a physical label or tag attached, or is a certificate on file enough?
In many jurisdictions, a certificate on file is sufficient - but not everywhere. California and New York City require a physical certification label affixed directly to each treated drape. Missing labels are one of the most common inspection failure points even when all other documentation is complete. On-Site affixes compliance labels to drapes as part of our certification service.
How can a facility manager quickly assess compliance before an inspection?
Work through these questions. Documentation: Is the FR certificate less than 3 years old? Does it identify the fabric type (FR or IFR)? Does it identify the test standard, and does that match your jurisdiction? Has an NFPA 705 field test been conducted in the past 12 months? Are cleaning and re-treatment records on file, documenting who performed the work and which product was used? Physical condition for FR-treated drapes: Any visible dust, water damage, food or biological staining, rips, tears, or unsewn hems? Have drapes been washed, dry-cleaned, or steam-cleaned since last FR treatment? For IFR drapes: Professionally cleaned in the past 3 years? Any physical damage or fiber degradation? Compliance labels physically attached to each drape? If any answer raises a concern, contact On-Site for NFPA 705 field testing before your next inspection.
What is NFPA 701, and what are the two test methods?
NFPA 701 is the Standard Methods of Fire Tests for Flame Propagation of Textiles and Films - the primary laboratory certification standard for new drapery fabric. Test Method 1 applies to standard textiles such as drapery: 10 samples of approximately 4.9 by 47 inches (including 4 folded samples), with 120 seconds of flame exposure. Test Method 2 applies to plastic or vinyl-lined materials: 10 samples of approximately 5.9 by 15.8 inches, with 45 seconds of flame exposure. To pass either method: flames must self-extinguish in less than 2 seconds and mass loss cannot exceed 40%. Because it requires approximately one yard of fabric, NFPA 701 cannot be performed on installed curtains without being destructive. When buying new drapes, always insist that NFPA 701 certificates be provided by the manufacturer.
What is NFPA 705, and how is it conducted?
NFPA 705 is the Recommended Practice for the Field Flame Test for Textiles and Films - the standard field screening test for installed drapery. A fabric sample of minimum 1/2 inch by 4 inches is cut from an inconspicuous spot on the drape. Hold the sample vertically and apply flame to the bottom edge for exactly 12 seconds. A pass means the flame self-extinguishes within 2 seconds, with no flash, no flaming drips, and the fabric chars but does not propagate. A fail means the fabric flashes, burns 2 or more seconds after removing the flame, or produces flaming drips that continue burning. On-Site regularly conducts NFPA 705 field tests and issues certificates on behalf of clients.
What is NFPA 260, and when does it apply?
NFPA 260 is the Standard Methods of Tests and Classification System for Cigarette Ignition Resistance of Components of Upholstered Furniture. It applies to upholstered items - chairs, sofas, ottomans, banquettes - used in public assembly spaces. On-Site offers testing to NFPA 260, NFPA 701, NFPA 705, NFPA 265, California TB-117, and CAN/ULC S-109.
What is NFPA 265, and when does it apply?
NFPA 265 is the Standard Methods of Fire Tests for Evaluating Room Fire Growth Contribution of Textile or Expanded Vinyl Wall Coverings on Full Height Panels and Walls. It applies to fabric wall coverings in assembly occupancies - decorative fabric panels, acoustic wall treatments, and padded wall surfaces. The test uses a 12-inch by 12-inch gas burner at 40 kW for 5 minutes, then 150 kW for 10 minutes. The material fails if any two of these occur: heat release exceeds 1 megawatt, heat flux at the floor exceeds 20 kW per square meter, average upper-layer temperature exceeds 600°C, flames exit the doorway, or a paper target on the floor auto-ignites.
What is California TB-117, and is it relevant outside California?
California Technical Bulletin TB-117 was originally adopted in 1975 and became the de-facto national standard for flame retardants in upholstered furniture. A revised version, TB-117-2013, took effect January 2015. The revision focused on the flammability of the final assembled item and allows manufacturers to produce without flame retardants - so products made after January 1, 2015 must include a label disclosing what flame retardants, if any, were used. For commercial facilities in California, TB-117 and Title 19 Division 1, Chapter 8 apply in addition to NFPA 701.
The fire marshal said I need a Match Flame Test - what is that?
A Match Flame Test (NFPA 705 procedure): a small corner of fabric is held to a lit match for 12 seconds; if it continues burning after the flame is removed, it fails; if it self-extinguishes, it passes. When a fire marshal issues a notice requiring a match flame test, it means the compliance status of your drapes has been flagged. Contact On-Site immediately - we can perform the test, re-treat if needed, and issue the certificate required to clear the notice.
How do I get my drapes flameproofed?
Contact On-Site for a free estimate. We regularly re-test and re-apply flame retardant for clients on a scheduled maintenance basis. We handle the full process - cleaning, treatment, and certification - in a single visit to your facility.
What chemicals are used in flame retardant treatment?
Flame retardants for fabric are generally mineral-based compounds including salts, phosphates, sulfates, and other mineral-based coatings. They contain no Volatile Organic Compounds (VOCs), PCBs, or PBDEs, and are not considered hazardous. The Health, Flammability, and Reactivity ratings are all 0. The only precautions listed relate to prolonged direct skin or eye contact, which can cause minor irritation. On-Site uses only VOC-free, non-toxic mineral-based flame retardants - safe for occupants, staff, and the environment.
Can flame retardant be applied over dirty drapes?
No. Applying flame retardant to dirty drapes causes two specific problems: first, the retardant congeals on the dust and falls off rather than bonding to the fabric fibers, rapidly diminishing effectiveness. Second, applying treatment over dirty fabric causes permanent blotchy stains. Manufacturer specifications require that fabrics be professionally cleaned prior to flame retardant application. This is a condition of the treatment’s validity - applying to dirty drapes will void the warranty.
Can new drapes purchased from a supplier be flameproofed?
Yes. On-Site treats new fabric installations as well as existing drapes requiring re-treatment. If your facility is installing drapery fabric that is not inherently flame resistant, we can apply treatment and issue the required certificate.
Fabric Terminology - FR, IFR, DFR, PFR, NFR, CBFR, CNFR
What does FR mean?
FR stands for Flame Retardant. The fabric has been topically treated after weaving with a water-soluble chemical compound that reduces flammability. Because the treatment is water-soluble, it will be removed by washing, steam, or prolonged exposure to humidity above approximately 65%. FR-treated fabric must be re-tested and re-treated periodically - typically on a three-year cycle.
What does IFR mean?
IFR stands for Inherently Flame Retardant. The flame-resistant properties are built into the molecular structure of the fiber itself - most commonly in Trevira™ or Avora™ branded polyesters. The flame resistance will not wash out through laundering or dry cleaning and is expected to last the life of the fabric. Annual field testing is still recommended because dust accumulation, humidity, and contamination can affect real-world performance.
What do DFR and PFR mean?
DFR (Durably Flame Retardant) and PFR (Permanently Flame Retardant) are often used interchangeably with IFR. They describe polyester fabrics treated during fiber manufacturing with a non-water-soluble compound - the resistance is expected to last the life of the fabric and withstand normal cleaning.
What does NFR mean?
NFR stands for Non-Flame Retardant. The fabric has not been treated and does not meet flame-resistance standards. NFR fabric should not be used in regulated public spaces without first being treated by a licensed applicator. Some NFR fabrics can be treated (CBFR); others cannot (CNFR).
What do CBFR and CNFR mean?
CBFR (Can Be Flame Retarded) means the fabric is currently NFR but can accept a topical flame-retardant treatment - most cotton and many blended fabrics fall into this category. CNFR (Cannot be Flame Retarded) means the fabric cannot be treated to meet flame-resistance standards. Fabrics with metallic content, certain acetates, and some coated synthetics are commonly CNFR and cannot be used in regulated public spaces.
Does flame retardant mean the fabric won’t burn?
No - this is one of the most common misconceptions in the industry. Flame retardant does not mean fireproof. Almost any treated fabric will burn to some extent when exposed to sufficient heat. What distinguishes an FR fabric from an NFR fabric is the degree and speed of burning: FR fabric self-extinguishes when the flame source is removed and does not propagate fire; NFR fabric continues to burn and spread rapidly. The goal is to slow spread and allow time for evacuation.
Does humidity affect flame retardancy?
Yes, significantly. FR treatments are water-soluble, and moisture exposure - even from a persistently humid room - degrades FR properties over time without any deliberate washing. The effect is invisible - there is no visual sign that treatment has degraded until the drape fails a field test. HVAC ducts that discharge directly onto curtains accelerate this process. Any evidence of water damage, staining, or moisture exposure should be treated as a trigger for re-testing regardless of when the drape was last certified.
Can scenic paint or printing affect a curtain’s flame resistance?
Yes. Paints, inks, and coatings can interfere with or alter flame performance. Some paints act as accelerants; others seal the surface and prevent topical treatment from penetrating. Muslin used for painted scenic backdrops is commonly supplied as NFR because many scenic paints react adversely with FR chemicals. For new scenic projects, fire safety should be planned before fabrication and painting begins.
What is Trevira™ or Avora™ polyester, and why does it matter?
Trevira™ and Avora™ are brand names for IFR polyester fibers with flame resistance built directly into the fiber’s molecular structure. Stage curtains, window drapes, and cubicle curtains manufactured from these fibers meet NFPA 701 requirements without topical treatment and without the compliance risk of treatment washing out. They are more expensive upfront but eliminate recurring re-treatment costs.
Can polyester fabric fail a flame test?
Yes. Not all polyesters are IFR. Standard polyester may or may not be inherently flame resistant depending on fiber type, fabric weight, weave, and nap. Heavy dust and soil accumulation can cause even IFR polyester curtains to fail a field test when heavily contaminated. Always verify the flame-resistance status of any polyester fabric before using it in a regulated space.
How does fabric construction affect flammability?
Two construction factors significantly influence how quickly a fabric ignites. First, surface texture: long, fluffy pile materials - such as the nap on a velour stage drape - are more likely to ignite than the same fabric with a hard, tight surface. Loose threads burn easily, and a drape with rips or unfinished edges is more likely to fail a flame test. Second, weave tightness: fabrics with a tight weave are less likely to ignite than the same fabric in a looser weave. This is why heavy cotton velour - with its dense, tight construction - has been the traditional choice for stage drapery.
Stage Curtains, Theatres, and Schools
Why do stage curtains need special care?
Stage curtains are larger, heavier, more expensive, and located near lights, rigging, scenery, and large audiences. The history behind these requirements is sobering: the Iroquois Theater fire in Chicago (1903, 602 deaths) where a stage light ignited curtains; the Cocoanut Grove nightclub fire in Boston (1942, 492 deaths) caused by decorative fabric; the Station Nightclub fire in West Warwick, Rhode Island (2003, 100 deaths) where acoustic foam panels were ignited by pyrotechnics; and most recently the Le Constellation Bar fire in Crans-Montana, Switzerland (2026, 41 deaths). The NFPA first required textile flameproofing in 1938. These regulations exist because they save lives.
How often should school stage curtains be cleaned and flameproofed?
Flame retardant on stage drapery typically needs to be re-applied every five years to remain effective. New York and California require annual testing with re-treatment every three years; most other jurisdictions require testing every three to five years, or simply "as often as required to pass NFPA 705." The practical district-wide approach: implement a five-year preventative maintenance plan, beginning with a baseline inventory and NFPA 705 field test on all curtains. Address failures as remove, replace, or restore. Spread re-testing across years two through five so the full district is re-certified at the five-year mark.
Why are school stage curtains a frequent fire-inspection issue?
They are often installed and forgotten. There are approximately 130,000 K-12 schools in the US, and an estimated 99% have no board-level drapery compliance program - certificates are routinely lost, treatment wears off, and there is no ongoing enforcement trigger. There were 3,280 fires in US schools between 2014 and 2018, and two out of every five school fires are intentionally set. If flame retardant is intact, stage curtains will not ignite. On-Site holds long-term contracts with school districts and offers multi-school program pricing.
What should a technical director keep in the stage-drapery file?
Curtain inventory, fabric type, manufacturer if known, installation date, cleaning dates, flameproofing dates, NFPA 705 test results, certificate expiry dates, repair notes, and photos. A small fabric test sample attached to each curtain or stored in the file allows field testing without cutting into the main curtain body. Many jurisdictions - including California and New York City - require a physical certification label affixed to each drape.
What should school districts look for when purchasing new stage curtains?
When buying new stage curtains, school districts should insist on a Certificate of Compliance to NFPA 701 from the curtain manufacturer. Districts should also ask about the source of the fabric: some IFR fabrics imported from overseas have been found to carry inaccurate flame certifications. Demand documentation from credible, verifiable testing laboratories. Once installed, keep that certificate in the district’s fire-safety files and schedule the first re-test within five years.
Is it cheaper to restore stage curtains or replace them?
Restoration is almost always less expensive, often a fraction of the replacement cost. A drape that fails a flame test is not necessarily at end of life - in most cases it simply needs professional cleaning to remove the combustible dust and old treatment, followed by re-application of flame retardant. Only drapes that are severely degraded, dry-rotted, or physically damaged beyond repair need to be replaced. On-Site assesses each piece individually and recommends the least-cost path: Remove, Replace, or Restore.
Can stage curtains last for decades?
Yes. With proper care, stage draperies can last over 25 years. Heavy velour stage curtains represent a significant capital investment - when kept clean, handled correctly, protected from water, and maintained on a planned service schedule, they deliver decades of reliable service. Neglect, moisture, dust, rough handling, and HVAC air blowing directly onto the fabric shorten their life dramatically. Planned maintenance is far less expensive than premature replacement.
Are there free resources available to help schools with stage safety?
Yes. The United States Institute for Theatre Technology (USITT, usitt.org) offers free stage drape rigging inspections for high schools. The National Fire Protection Association (NFPA, nfpa.org) provides codes, standards, and educational resources for fire safety compliance. On-Site can also assist with NFPA 705 field testing, fire code interpretation, and developing a preventative maintenance plan tailored to a district’s specific inventory and budget.
Do acoustic panels and sound baffling need to be flame resistant?
Yes - and this is one of the most overlooked compliance items. Acoustic baffling, foam panels, and fabric sound-dampening treatments suspended from ceilings or mounted on walls are subject to the same NFPA 701/705 requirements as stage drapery. They are rarely tested and almost never included in routine flameproofing programs. The 2026 Crans-Montana bar fire (41 deaths) was caused by acoustic baffling ignited by sparklers on champagne bottles - the identical mechanism as the 2003 Station Nightclub fire. Any venue with suspended acoustic panels or foam baffling should treat these as a priority compliance item, particularly if open flame is permitted on the premises.
Can On-Site work around rehearsals, performances, or school schedules?
Yes. Stage work is scheduled around dark days, holidays, school breaks, or load-in windows. On-Site can coordinate with facility managers, technical directors, and custodial teams where required.
Stage Curtain Care, Storage, and Handling
What should be included in an annual stage curtain maintenance inspection?
On-Site recommends the following annual routine: vacuum or blow dust off tracks, chains, and cables first; vacuum drapes with a light brush attachment starting from the back, then front, brushing first against the nap and then with it, including between pleats; keep the stage area as dust-free as possible during the year; conduct a visual inspection checking cords, hooks, and hardware for wear; repair any tears or rips promptly - small repairs caught early prevent the need for panel replacement; and test drapery for flame retardancy per NFPA 705. Document findings and schedule On-Site service if cleaning, re-treatment, or repairs are needed.
How should stage curtains be stored when not in use?
The best option is to leave curtains hanging in place, which avoids fold lines, stress, and moisture trapping. If they must be taken down, store them in canvas hampers or bags - never in plastic. Plastic traps moisture, promotes mildew, and causes flame-retardant chemicals to leach and stain the fabric. The storage environment matters: excessive humidity causes FR chemicals to bleed out, leaving stains; excessive dryness causes FR to turn to powder and fall out of the fabric. A moderate, climate-stable environment is ideal.
How should stage curtains be folded for storage?
Fold face-to-face and hem-to-crown, then fold each end toward the center until you have a workable bundle. Store in labeled canvas hampers in a clean, dry location. Folds stress the fabric and create permanent creases. The general industry advice: don’t fold them if you can avoid it. Label all drapes clearly with their position so they can be re-hung correctly.
How are wrinkles removed from stage curtains?
Most wrinkles hang out naturally if curtains are pre-hung several days before a performance. A weighted bar in the hem can help remove stubborn wrinkles. Never steam a curtain that has FR treatment, as steam removes the treatment.
Can a floor broom be used near stage curtains?
Never. Floor brooms are typically treated with oil-based dust-binding compounds that penetrate fabric fibers and are nearly impossible to remove - and these compounds increase flammability. Stage curtains should be dusted with a clean soft brush in the direction of the nap, or blown off with compressed air.
Can I spot-clean a stain on a stage curtain?
Minor stains can sometimes be brushed out dry. If that fails, commercial dry-cleaning solvents can be tested in a small, inconspicuous area first. Be aware that any wet spot cleaning will remove flame retardant from that area, requiring re-treatment. For multiple or severe stains, professional cleaning of the full panel is the better approach.
What causes stage curtains to dry-rot?
Dry rot results from embedded dust, airborne chemical residues, and UV exposure attacking fabric fibers from within. This accelerates dramatically without regular cleaning. A curtain that looks intact can be structurally weak - fibers become brittle and tear easily at seams, pleats, and headings. Heavy curtains with dry rot are a safety risk if the fabric fails under the curtain’s own weight during operation. Regular cleaning is the primary preventative measure.
Custom Drapery Manufacturing
Does On-Site manufacture custom stage curtains and drapery?
Yes. On-Site manufactures custom commercial drapery including stage curtains, valances, borders, legs, rear curtains, window drapes, and hospital cubicle curtains. We also provide installation, cleaning, repair, flameproofing, and maintenance.
What information is needed for a stage curtain quote?
Useful information includes: stage width and height, track or batten location, finished curtain height, fullness preference, fabric type, color, lining requirements, opening style (guillotine/fly vs. traveler), rigging conditions, photos, and whether existing curtains are being replaced. On-Site can guide the measuring and specification process.
What is the difference between a main curtain, legs, borders, and a rear curtain?
The main curtain (Grand Drape) is the front curtain that opens and closes to reveal the stage. Legs are vertical side curtains that hide the wings. Borders (valances) are horizontal curtains that mask lights and rigging above the stage. A rear curtain (cyclorama, cyc, or backdrop) hangs at the back of the stage. Together these pieces form a complete masking system.
What fabric is best for a main stage curtain?
Heavy cotton velour is the traditional choice for its rich appearance, superior light absorption, and acoustic performance. IFR synthetic velours are popular for venues that want to avoid annual re-treatment. The best choice depends on budget, appearance priorities, maintenance expectations, local code, and how the stage is used. On-Site can provide fabric samples and recommend the appropriate weight for each curtain position.
What is commando cloth used for?
Commando cloth (also called duvetyn) is a durable, matte cotton fabric commonly used for legs, borders, masking, and backstage areas. It blocks light effectively, is less expensive than velour, and is available pre-treated with flame retardant. On-Site stocks 16 oz (heavy commando) for greater durability and longer service life.
Does On-Site work with interior designers on custom drapery projects?
Yes. On-Site’s sewing shop works directly with interior designers to produce handcrafted custom drapery solutions including custom drapes and curtains, roman shades and window treatments, soft upholstery including decorative pillows and cushions, and bedding and decorative textiles. Designers can bring their own fabric or source from our curated collection. We offer on-site measurement and installation, rush orders for time-sensitive projects, and a free initial consultation.
Specific Facility Types
How often should hotel drapes be cleaned?
Most hotel properties benefit from annual drapery cleaning. Guest rooms see high turnover and accumulate odors, smoke, and allergens year-round. But compliance risk extends beyond guest rooms: hallways, exits, lobbies, and ballrooms all fall under fire code requirements and are rarely inspected for drapery compliance. On-Site has worked with many prestigious hotel brands including Four Seasons, Hilton, Marriott, Wyndham, InterContinental, Hyatt, and Disney.
How do you clean draperies in an occupied hotel without disrupting guests?
On-Site can take down, deep clean, and re-hang guest room drapery within 2.5 hours per floor - no need to take rooms out of service. No downtime means no lost revenue. We coordinate directly with housekeeping and engineering to work floor by floor, typically completing an entire floor of guest suites in a single day.
What should hospitals and long-term care homes know about privacy curtains?
Privacy curtains are touched constantly by patients, visitors, and staff, but are often cleaned far less frequently than hard surfaces. Multiple studies have confirmed the infection risk: a Cleveland Clinic study found over 42% of hospital curtains were contaminated with infectious pathogens; a University of Iowa study found 92% were infected; the Journal of Infection Control found 87.5% were contaminated. Regular professional cleaning is a critical component of any infection-prevention program. Recommendations are to clean curtains at least annually, upon patient discharge, and upon outbreak.
Why is drapery compliance critical in long-term care facilities?
Long-term care facilities represent the highest life-safety risk for drapery non-compliance. Many residents cannot self-evacuate - many are bedridden, wheelchair-bound, or have dementia. Night staffing can be as low as one worker per 20 residents. Bedside privacy curtains are the highest-risk installation because they are inches from non-ambulatory residents. Open flames for religious observances are common in these facilities. Many buildings have fabric installed decades ago with certificates long lost.
What should a restaurant or banquet hall do about drapery fire compliance?
Restaurants and banquet halls with dining rooms exceeding approximately 100 occupants are assembly occupancies subject to mandatory flame resistance requirements for draperies. Many are out of compliance without realizing it - particularly where decorative drapes were purchased without verifying flame resistance. On-Site can test existing drapes, apply treatment where needed, and issue certificates. Service can typically be scheduled during off-hours to avoid operational disruption.
Do theaters and performing arts centers have special drapery requirements?
Yes. In addition to flame resistance requirements, many jurisdictions require that a Certificate of Flame Retardant Testing be maintained on file at the facility at all times, available for review at any inspection. On-Site has specialized experience with performing arts centers, community theaters, school auditoriums, and event venues, and works regularly with technical directors and facility managers.
Can On-Site service government and military facilities?
Yes. Government and military facilities often require insured vendors, documented procedures, certificates, and careful scheduling. On-Site has served U.S. military installations and holds the licensing, insurance, and documentation practices appropriate for government procurement.
Can event decorations and trade show displays be flameproofed?
Many can - fabric, banners, scenic materials, artificial foliage, paper items, and props. For trade shows, convention centers often require flame certificates for booth fabric, banners, and draping. Certificates should be brought to move-in, not requested on arrival. Christmas trees, garlands, and wreaths can also be treated. Some materials (metallics, coated plastics, certain synthetics) cannot be treated and should not be used in regulated spaces.
Maintenance Programs, Assessment, and Procurement
What does a professional stage drapery assessment from On-Site include?
On-Site’s professional assessment covers: visual stage inspection; condition and functionality assessment of all drapery and tracks; documentation with photographs and measurements; safety inspection for any hazards; damage inspection for rips, stains, missing hardware, and life expectancy; NFPA 705 flame testing; issuance of Pass/Fail certificates; and a written summary report with results and recommendations. Recommendations are categorized as: No Action Required, Clean and Re-Apply Flame Retardant, Optional Clean, Repair, or Replacement. Transparent pricing is provided for each recommendation.
How does the On-Site Drapery Maintenance Program work?
On-Site’s Maintenance Program starts with a baseline inventory and NFPA 705 field test on all draperies. For drapes that pass, we issue certificates and schedule future re-testing. For drapes that fail, we develop the least-cost compliance plan using one of three approaches - Remove (non-essential curtains that can be discarded, the cheapest option), Replace (drapes too degraded to restore, the most expensive option), or Restore (cleaning, repair, and re-treatment, typically a fraction of replacement cost). We then establish an ongoing service schedule with automatic reminders when re-certification is due, and provide five-year budget forecasting so costs are always predictable.
How should we budget for drapery cleaning and flameproofing?
Treat drapery as a building asset, not a one-time purchase. Budget for regular cleaning, periodic flameproofing, repairs, and eventual replacement. On-Site’s Preventative Maintenance Program includes precise budget forecasting, allowing facilities to anticipate costs and plan financial allocations up to five years in advance. Our database tracks certificate expiration and end-of-life dates for every location. Planned maintenance is almost always less expensive than emergency replacement after a failed inspection.
What questions should I ask any drapery cleaning or flameproofing vendor?
Ask: Does your cleaning method use water or liquid solvents? Will flame retardant be removed by your process? Are your technicians licensed for flameproofing in this jurisdiction? Do you carry full liability and workers’ compensation insurance? Do you provide a Certificate of Flame Retardant Application after service? Do you conduct NFPA 705 field testing? Do you guarantee no shrinkage, no fabric damage, and no color fading in writing? Do you clean and flameproof in the same visit? Will my drapes be taken offsite, or cleaned on-location? Can you work within our operating schedule? Any vendor who cannot clearly answer these questions represents a compliance and financial risk.
What is the risk of choosing the lowest-cost cleaning vendor?
A low initial price can become expensive if the vendor uses a wet method that shrinks drapes, strips flame retardant requiring immediate re-treatment, fails to provide valid compliance documentation, or damages delicate fabric. The right vendor reduces compliance and financial risk, not creates it. Always evaluate total cost - including the cost of replacement, re-treatment, and failed inspections - not just the service quote.
How far in advance should I schedule drapery service?
Theatres and performing arts centers should schedule service during dark periods - school breaks, summer closures, or between productions. Most providers request at least three weeks’ notice for standard projects; emergency service may be available but cannot be guaranteed. On-Site’s Maintenance Program eliminates scheduling stress by securing calendar time well in advance.
Does On-Site work with insurance companies and restoration contractors?
Yes. On-Site has worked with leading restoration companies and insurance adjusters since 1978. Our non-immersion process has the highest recovery rate in the industry for smoke, water, and construction-damage claims involving window coverings. We work directly with restoration contractors on the full workflow: same-day take-down, per-piece assessment, cleaning and restoration, secure storage during construction, and professional re-installation with photographic inventory. We can dramatically improve loss ratios on drapery claims.
About On-Site Drapery Cleaners
How long has On-Site been in business?
On-Site has proudly served commercial and institutional clients since 1978 - over 46 years of continuous service. As a family-owned business, we have built our reputation on quality workmanship, consistent results, and standing behind our work with guarantees no competitor offers.
Is On-Site a family-owned business?
Yes. On-Site is a family-owned and operated business in continuous operation since 1978. The values that started the company - quality craftsmanship, honest pricing, and guaranteed results - remain the foundation of everything we do. When you work with On-Site, you work with a company that treats your facility the way we would treat our own.
Where does On-Site operate?
On-Site serves most regions of the United States through mobile service operations from hubs in Florida, Illinois, New Jersey, and California. We also serve Canada. Contact us to confirm service availability for your location.
What types of customers does On-Site serve?
We serve schools, universities, hospitals, hotels, resorts, golf and country clubs, theaters, performing arts centers, museums, military installations, convention centers, restaurants, banquet halls, churches, stadiums, long-term care homes, and event venues. We also work with stage companies, interior designers, fire inspectors, safety engineers, insurance adjusters, and restoration companies - all with the same goal: a healthy, cost-effective solution that extends the life of every drapery investment.
Does On-Site serve residential customers?
No. On-Site focuses exclusively on commercial, institutional, healthcare, hospitality, education, and theatre environments. We do not service private residences.
Is On-Site a franchise?
No. On-Site is not a franchise. Every service is delivered by trained On-Site employees - not subcontractors - using our proprietary process, equipment, and documentation standards.
What guarantees does On-Site offer?
On-Site is the only drapery cleaning company that guarantees - in writing - no shrinkage, no fabric damage, no color fading, and complete customer satisfaction. Ask any competitor whether they will match those guarantees before you trust them with your drapes.
What certifications does On-Site hold for flameproofing?
On-Site’s flame retardant product holds: a New York City Fire Department Certificate of Approval, a California State Fire Marshal Applicator License, independent lab certification to NFPA 701 Test Method 1, and independent lab certification to California Administrative Code Title 19. Our technicians are licensed applicators in jurisdictions where licensing is required.
How quickly can On-Site provide a quote?
Typically within 24 hours. Send your contact details and photos of your facility using our website contact form. Your account manager will send our quote form; once completed with panel dimensions and counts, a detailed quotation is returned within 24 hours. For urgent fire-inspection situations, call us at 1-800-465-2082 for priority handling.
I am interested in a business relationship with On-Site. Who should I contact?
Please contact us at 1-800-465-2082 or through the contact form on our website. We are always open to discussing potential business relationships with qualified candidates.
