Home / Blog / Decorative Film on Office Glass: What to Check
Decorative and Frosted Film on Office Glass Walls and Doors: What to Check First
Frosted film can turn a clear office partition into a private one, and the film choices (which pattern, how much light, how much privacy) are the easy part. This post is about the questions that come first and are easy to skip: what the glass is, whether the door is an exit, whether the glass is fire-rated, and which published rules touch a band of film across a door. Residential privacy, such as bathrooms and street-facing windows, is covered in our privacy film post; the range we install is on our decorative film page. For the screen-privacy side of conference rooms, see our cloaking film post.
Published October 7, 2026 · Armored Glass Solutions
Start With the Glass
Three things on the glass that decide the job
Is it tempered or laminated, and is it in or beside a door? California Building Code 2406.4.1 says: "Glazing in all fixed and operable panels of swinging, sliding and bifold doors shall be considered to be a hazardous location." Section 2406.4.2 treats glazing within a 24-inch arc of a door edge, with its bottom edge less than 60 inches above the walking surface, the same way. Those sections are about impact safety. The code exempts "decorative glazing" but defines it narrowly (carved, leaded or Dalle glass whose design cannot be removed without destroying it). Film is made to come off, so we would not assume it changes how a door or sidelite is judged; that is a question for your building official, not a ruling from us. Film also does not make glass safety glass. See is window film safety glass for the framework.
Is the glass fire-rated, or is it in a rated door? Fire-rated glazing has to be labeled; CBC 716.1.2.2 says "Fire-rated glazing assemblies shall be marked in accordance with Tables 716.1 (1), 716.1 (2) and 716.1 (3)." We found no manufacturer approval for film on fire-rated glass. The glazing maker, the UL listing and the fire marshal are the people to ask before anyone applies film.
Is it an exit door? CBC 1010.1 says: "Doors in the means of egress shall be readily distinguishable from the adjacent construction and finishes such that the doors are easily recognizable as doors. Mirrors or similar reflecting materials shall not be used on means of egress doors. Means of egress doors shall not be concealed by curtains, drapes, decorations or similar materials." Federal OSHA says in 1910.37(b)(3): "Each exit route door must be free of decorations or signs that obscure the visibility of the exit route door." Neither text mentions window film. Whether a given frosted or graphic film counts as a "decoration" that conceals a door is a question for the building official and fire marshal.
What California Says
Is there a rule that office glass walls must be marked?
People often assume there is. We looked, and did not find one. In the 2025 California Building Code chapters we read (10, 11B and 24), the 2010 ADA Standards, federal OSHA 1910.37, and Cal-OSHA Title 8 sections 3235 and 3242, we found no collision-visibility marking rule for glass walls or glass doors. Chapter 24's door rules are about impact-safe glass. Cal-OSHA 3242 points to Chapter 24 of the 1997 Uniform Building Code, which we did not read, and we did not read local amendments. So the careful statement is "none found in what we read," not "none exists."
Some places do have marking rules. This is New York City, not California: its building code says "Transparent doors and fixed adjacent sidelites shall be marked in accordance with Sections 2410.3 through 2410.4." This is England, not California: Approved Document K requires non-domestic transparent glazing to incorporate features that make it apparent.
The Rules That Bite
Vision-light height and exit-door visibility
The one published rule that bears directly on a frosted band across a door is the vision-light rule. California 11B-404.2.11 repeats the ADA text: "Doors, gates and side lights adjacent to doors or gates, containing one or more glazing panels that permit viewing through the panels shall have the bottom of at least one glazed panel located 43 inches ( 1092 mm) maximum above the finish floor." The exception covers glazing panels whose lowest part is more than 66 inches from the finish floor. The ADA 2010 Standards say the same at 404.2.11.
What no source answers is whether a frosted film counts. A band that blacks out the lower part of a door or sidelite panel could change which panel "permits viewing," and a full-height frost on an exit door raises the egress question above. Both are questions for your plans examiner or an accessibility specialist (CASp) before film is quoted.
Design Judgment
Privacy band height: what is published and what is not
No manufacturer data sheet we read gives a recommended height for a privacy band. 3M describes gradation products with the frosting at the center ("-W") or at the bottom ("-S") of the sheet, but gives no heights. The GSA's P100 standard for federal buildings lists applied film among the ways to get visual privacy in demountable partitions and sets no height either.
The only quantified privacy measure we found is LLumar's 0 to 10 privacy rating, defined as the relative difficulty of identifying an object on the opposite side of the glass from at least two feet away. LLumar calls it a guide only. So band height is a design decision: where the people sit and stand behind the glass, where the viewers are, and whether the band crosses a door. It is settled on site by looking through the glass, not from a chart.
Reading the Numbers
Light and privacy figures, read correctly
3M's US Technical Data Sheet (Revision P, March 2022) lists visible light transmittance for each FASARA design, measured on a 0.1 inch (3 mm) clear glass substrate. The values are typical, not warranted, and for patterned designs the value is an average across the pattern. A few designs:
| Design | Visible light transmittance, % |
|---|---|
| 3M FASARA Frost Matte | 89 |
| 3M FASARA Matte Crystal 2 | 86 |
| 3M FASARA Lausanne | 84 |
| 3M FASARA Mare | 78 |
| 3M FASARA Milky White (Milano) | 59 |
| 3M FASARA Illumina Silky-W (gradation) | 54 |
| 3M FASARA Milky Milky (San Marino) | 21 |
| 3M FASARA Opaque White | 10 |
For a band or gradation, the clear portion is clearer than the average, so the number does not describe what you see through the open part. Other makers publish on different bases and do not always state the glass, so we do not set their numbers beside 3M's. For the broader comparison of frost, gradient, opaque and reflective films, see our privacy film post, and for how to read a data sheet generally, reading a window film spec sheet.
Where It Goes and Where It Does Not
Interior-only, humidity, heat and the glass itself
3M describes FASARA as for vertical applications in commercial buildings, on interior glass including the interior of an outside glass wall, and says it is for glass only. Only a handful of designs (Mat Crystal 2, Milky Crystal, Frost Matte, Frost Sucre and Illumina Alpha) are designed for exterior glass. 3M also says not to install it where the film may frequently contact water or where condensation often occurs, and "Non-vertical applications are not warranted." Avery Dennison's Blue Sandstone data sheet, for example, says it is not recommended for perimeter glass, and 3M's warranty periods are shorter on perimeter glass than interior glass.
Heat is the other limit. 3M warns that glass covered by film with areas of high opacity or dark-colored ink absorbs more heat in sunlight than other glass, that the thermal expansion could result in breakage or cracking, and not to use such film on glass with significant sunlight exposure. Our post on thermal stress in dual-pane glass covers the mechanism. Finally, 3M's documents say "glass substrates only" and say nothing about tempered, laminated, heat-strengthened or insulated glass, so the glass type goes on the list of things to confirm in writing.
Care, Life and Removal
Five to 20 years is not a warranty
3M's statement is: "Expected performance life of five to 20 years for indoor, vertical applications on non-perimeter glass, depending on the design." Its US limited warranty is a separate and shorter thing, one to five years depending on design and perimeter or interior location. Solar Gard's byDESIGN warranty runs from one year for its Print Series to seven for its Modern Polyester Series, interior only. We do not quote a single "lasts X years" number, and we are not repeating a manufacturer warranty as our own.
Removal has conditions. 3M: "Removable with heat and/or chemicals from supported substrate within the Expected Performance Life. After removal low adhesive residue is possible." Removing film too quickly may leave excessive adhesive on the glass. Cleaning has a wait too: "Do NOT clean the Product until 30 days after installation." 3M also says not to use ammonia, chlorine or organic-based cleaning products.
On fire behavior, 3M's US data sheet says: "When used in interior applications, all patterns have a Class A fire rating per ASTM E84". That is a surface-burning test for the film. It is not a fire rating for glass, and it says nothing about film on fire-rated glazing.
Fire-Rated Glass
Why we say ask first
Fire-rated ceramic glass such as FireLite carries a permanent label with the maker's logo, UL logo and fire rating. The maker's fact sheet says it "may be lightly sandblasted or etched on one side without affecting fire rating" and describes FireLite NT as the factory-filmed, listed version. Neither fact sheet addresses aftermarket decorative film. UL states that field evaluation is the appropriate option for modifications to a fire door assembly, and notes that a fire door inspection applies no label and makes no judgment on alterations. The Glass Association of North America's fire-rated glazing primer does not mention film.
Silence is not permission. We found no manufacturer approval for film on fire-rated glass or over the label, so the order is: glazing manufacturer, UL listing, fire marshal, then film.
Dry-Erase, Printed and Cut Films
Who makes what
3M says FASARA "is not designed for surface printing" and that electronic cutting is on a user test and approve basis only, so printed or plotter-cut graphics should be specified from a film made for it. LLumar's data sheet suggests combining Matte Frost with custom-cut logos, and Madico lists a plotter and design program for its films. Solar Gard's Print Series carries a one-year, interior-only warranty, and that warranty excludes product that has been printed on.
For dry-erase surfaces, use a film made for it. 3M's whiteboard film is rated at 5 years for vertical, indoor, non-perimeter glass, tells you never to use permanent markers or felt pens, and notes that seams tend to accumulate marker ink. The sheet we read is dated 2017, so confirm the current revision.
Before You Approve
What to ask for in writing
Before approving a film for office glass walls or doors, get these in hand:
- The film data sheet and warranty for the exact design, including the term by design and by location (interior or perimeter glass).
- Glass type for each pane: tempered, laminated, insulated, fire-rated, and whether any pane is in or beside a door.
- Which doors are exit doors, and whether any film will cross them.
- The 43 inch vision-light answer from your plans examiner or an accessibility specialist (CASp) for any door or sidelite the film will cross.
- For rated glass, written direction from the glazing manufacturer and the fire marshal, including where the label sits.
- Cleaning and removal instructions, and sun and humidity exposure at each pane.
If you are planning switchable privacy instead of a fixed pattern, see our smart film page. To have us look at specific glass, send us the details.
Questions
Decorative film on office glass: FAQ.
Does California require stickers or bands on a full-height glass wall or glass door in an office?
We did not find one. In the 2025 California Building Code chapters we read (10, 11B and 24), the 2010 ADA Standards, federal OSHA's exit-route rule and Cal-OSHA sections 3235 and 3242, we found no rule that says to mark glass walls or glass doors for visibility. Chapter 24's glass rules for doors are about impact safety. New York City and England do have marking rules, but neither is California. We cannot say nothing exists anywhere in California, including local amendments, so ask the local building department about your specific project.
Can I put a frosted band over the lower part of a glass door?
Check the vision-light rule first. The ADA and California 11B-404.2.11 say a door or sidelite with glazing that permits viewing must have the bottom of at least one glazed panel no higher than 43 inches above the floor, unless the lowest part of the glazing is more than 66 inches up. No source we found says whether a frosted film counts, so ask your plans examiner or an accessibility specialist (CASp). Exit doors must also stay recognizable and cannot be concealed by decorations, so raise that with the building official too.
What height should a privacy band be?
No manufacturer data sheet we read publishes a recommended height for a privacy band. The only published door-height numbers are the ADA and California vision-light figures, which are about doors, not privacy. Treat band height as a design decision made on site, looking through the actual glass from the actual desks and hallways. If the band crosses a door or sidelite, settle the vision-light question first.
How long does decorative film last, and can it come off?
3M says its FASARA film has an expected performance life of five to 20 years for indoor, vertical applications on non-perimeter glass, depending on the design. That is a performance estimate, not a warranty: 3M's US warranty periods run from one to five years depending on design and location. Removal is possible with heat and/or chemicals within that life, and 3M notes that low adhesive residue is possible after removal. Other makers publish their own terms by series, so read the data sheet for the exact film being quoted.
Can film go on fire-rated glass?
We found no manufacturer approval for it. The only listed film on fire-rated ceramic glass that we found is the factory-applied film in a product such as FireLite NT, and the maker's fact sheet allows light sandblasting or etching on the unfilmed side, with no mention of aftermarket film. UL says modifications to a labeled assembly call for field evaluation. Ask the glazing manufacturer, the UL listing and the fire marshal before anyone applies film.
Sources
Where these findings came from.
- 3M, 3M FASARA Glass Finishes Technical Data Sheet, US edition, Revision P, March 2022. PDF.
- 3M, 3M FASARA Product Bulletin, January 2025 (UK/Ireland edition). PDF.
- 3M, 3M FASARA Whiteboard Film WH-111-G Technical Data Sheet, Revision E, August 2017. PDF.
- U.S. Department of Justice, 2010 ADA Standards for Accessible Design, section 404.2.11. PDF.
- California Building Code 2025, Chapter 24, Glass and Glazing (UpCodes mirror). Chapter 24.
- California Building Code 2025, Chapter 2, Definitions (UpCodes mirror). Chapter 2.
- California Building Code 2025, Chapter 11B, section 11B-404.2.11 (UpCodes mirror). Chapter 11B.
- California Building Code 2025, Chapter 10, Means of Egress, section 1010.1 (UpCodes mirror). Chapter 10.
- California Building Code 2025, Chapter 7, section 716 (UpCodes mirror). Chapter 7.
- OSHA, 29 CFR 1910.37, Maintenance, safeguards, and operational features for exit routes. 1910.37.
- California Code of Regulations, Title 8, sections 3235 and 3242. 3235 and 3242.
- NYC Building Code 2022, Chapter 24, section BC 2410 (not California). Chapter 24.
- UK Government, Approved Document K (England, not California). PDF.
- U.S. General Services Administration, PBS P100 2024, Chapter 3. PDF.
- LLumar (Eastman), Architectural Decorative Window Film Specifications, North America, dated 07/19. PDF.
- Avery Dennison, Auravate Blue Sandstone Product Data Sheet, Rev 0, 08/21/24. PDF.
- Saint-Gobain Solar Gard, byDESIGN Limited Warranty, SK0364BD. PDF.
- Madico, Frost Matte product page. Page.
- Technical Glass Products, FireLite fact sheet. PDF.
- Technical Glass Products, FireLite NT fact sheet. PDF.
- UL Solutions, UL fire door inspection and field evaluation programs: what are the differences. Page.
- Glass Association of North America, Fire-Rated Glazing 101 (FB76-23). PDF.
Keep Reading
Related reading.
Screen privacy for conference rooms
How cloaking film works, which displays it hides, and what to test on site before you specify it.
Read the guide →Is window film safety glass?
What safety glazing standards cover, how tempered and laminated glass differ, and where film fits.
Read the guide →Reading a window film spec sheet
What the numbers on a data sheet mean and which ones are measured on which glass.
Read the guide →Planning film for office glass walls or doors?
Tell us the glass types, which doors are exits, and whether any glass is fire-rated, and we will go through the checks above before anything is quoted.