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US Gypsum drywall stamp © Daniel Friedman Drywall Type Identification
Stamps, markings, numbers help ID drywall including Type C, Type X, Fire rated

Guide to drywall identification

Here we illustrate identifying stamps, labeling, paper imprints, and other details that can help identify specific drywall or gypsum board products.

These markings can help forming an estimate of building age and also help identify drywall products that might contain asbestos.

This article series discusses the identification and history of both modern and older interior building surface materials such plaster and lath, Beaverboard, and Drywall - materials that were used to form the (usually) non-structural surface of building interior ceilings and walls. Our page top photo shows hand-split wooden lath backing for a plaster interior wall.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

- Daniel Friedman, Publisher/Editor/Author - See WHO ARE WE?

Identifying Stamps on Drywall Used for Interior Wall & Ceiling Surfaces

Canadian Gyproc gypsum board drywall (C) Inspectapedia.com GarciaIndex to photos of identification stamps and markings that help identify brands and types of drywall or gypsum board.

[Click to enlarge any image]

Since 2017, in North America, the following general format is used for drywall identification stamps (USGA 2017)

COMPANY NAME AAA2 0101010930 CCC

Watch out: depending on when it was manufactured, your drywall may be unmarked or may use stamps and imprints that pre-date or for other reasons do not follow the 2017 guideline given above.

We discuss and illustrate various forms of drywall or gypsum board product identification markings and stamps below on this page.

How to Decode Older or Non-Conforming Drywall Stamps

If using the 2017-and-later drywall date stamp decoder just above does not give sensible results then here are more drywall ID stamp decoding tools:

Table of Drywall Manufacturer Country Codes

If necessary, you can also identify the country where the drywall was probably manufactured (if you don't already know), using the table just below.

ISO Country Codes

  
ISO Code Country Name
(English)
BEL Belgium
BRA Brazil
CAN Canada
CHN China
COL Columbia
DEU Germany
DNK Denmark
HON Honduras
ITA Italy
MEX Mexico
USA United States of America

Notes to the table above

...

Other Methods for Identifying Drywall Manufacturer, Product, & Production Date

Drywall identification code and date stamp decoder (C) InspectApedia.com Matt

Review the formats and decodings of drywall stamps by various drywall manufacturers given below at this page starting at

Look for patent numbers in the drywall stamp

as often we can research the patent number to identify both the manufacturer and to set a ceiling on guesses at the age of the product.

  1. Find the drywall production date stamp code on the back surface of the product:

    this production code can be seen on installed drywall IF the back surface of the drywall remains exposed, for example when only one side of a wall or ceiling has been finished.

    Even in a completed structure where all walls are fully enclosed, you might find the production data stamp on drywall in the attic space by lifting insulation there.
  2. Find the drywall end-tape:

    Find the manufacturer's name and product name and other information such as drywall dimensions and type on the paper end-tape found on the ends of drywall segments.

    You will have trouble finding the end tape after drywall has been installed, because usually those ends are fastened to wall studs or wall sill and top plates where the 2x lumber obscures the tape.

    The end tape is also color-coded on modern drywall products, allowing quick identification of drywall thickness and type, such as fire-rated, mold-resistant, moisture-resistant.
  3. Find other printing on the back of the drywall:

    some drywall products such as CertainTeed's GlasRoc sheathing and Diamondback don't use end-tapes but have text printed across the whole board surface, indicating the manufacturer, product, and other data such as fire-rating.

Here is an end-tape from USG's Sheetrock drywall brand that we think was produced in the 1930s - cited and discussed below on this page

Drywall end tape identifies the manufacturer (C) Inspectapedia.com

  1. Find a stamp along the tapered drywall edge:

    modern drywall is often stamped with the manufacturer's name along the paper-enclosed tapered long-edge. These edges, too, will be impossible to see once drywall has been installed. Unless you remove it.
  2. Find patent numbers on the drywall end tape or on inked stamps

    on the drywall back: even when end tapes are only partially available or when only partial drywall data stamps are visible, patent numbers can often point to the manufacturer.

...

Context Information Adds Confidence to Guesses at Drywall Date Code Decoding

The ABC's of Decoding or Guessing Older Drywall Age From the Numbers on its Back Surface

On 2022-05-05 by Inspectapedia Com Moderator (mod) - suggestions for decoding unknown drywall numeric stamp: 07226505112

@Sly Bryjak,

Have you tried entering that number into one of the online UPC decoders?

I gave that a shot - doesn't look like a UPC. So we treat the number sequence as a production date-code.

At the start of this article we note that since 2017 there has been a standard drywall date code format used in the U.S. But for older drywall in older buildings or older remodeling efforts, there is not one single standard format for drywall production time/date stamps.

We could guess at decoding the numeric string you gave from the back of your drywall, but we could make a far more-credible guess if we had some contextual information including

  1. Identity of the manufacturer of the drywall:

    found in other stamps on the drywall back surface and/or on the remains of paper tape found on the ends of the drywall. (Usually these are hidden from view against the 2x4 that forms the wall top or bottom plate until or unless the drywall is removed. ) Different manufacturers use different drywall date code formats.
  2. Age of the building
  3. Age of remodeling

    or renovations that may mark the time when the drywall was installed - making it newer than the original building's construction
  4. Area of use:

    specific room(s) where we think that drywall was installed (a boiler room may use fire rated drywall where a bedroom may not and where a bath may use a moisture-resistant product).
  5. Building type

    (residential, commercial)
  6. Country and city

    of the building where the drywall was installed

Armed with that information that permits a reasonableness or "sanity check" on your (or our) guess at the drywall age date code-decoding, then take a look at the drywall date code decoding suggestions found in the article above.

The content of your numeric drywall stamp suggests that your building and this drywall were put up before 2017.

I guess that because since that year the date is encoded as YYMM in the first four digits of the stamp. But 0722 does not yield a year - month (since we just have 12 months in a year).

You might then try several guesses at the drywall's date code translation, checking them for reasonableness against what else we know about the building.

So 07226505112

might be

YYDDDNNNNNN or year -07 day 226 followed by a production plant and sequence number

or

NNNNNNYYDD or plant and sequence number followed by year -05 day 112

On 2022-05-05 by Sly Bryjak

Hello i got this Number on back of my drywall anyone knows when it was manufactured
07226505112
Thank you

...

Drywall Manufacturers' Identification Stamps & Codes

Now moved

to DRYWALL MANUFACTURER IDENTIFICATION STAMPS & DATE CODES - alphabetical list - separate web page

Gypsum Board Lath Sheets Used for Plaster Walls & Ceilings = Rock Lath, Plaster Lath, Rock Lathe & Button Board

Plaster lath board © Daniel Friedman

Now moved.

Details are found

at GYPSUM BOARD PLASTER LATH SYSTEMS.

...

Differences Among Type C & Type X Drywall & Type X Shaftliner Drywall

Both original Type X drywall and newer Type C drywall are fire-resistant products.

Type C has improved fire resistance over Type X.

Type X-Shaftliner drywall is a still-thicker fire-resistant drywall used in areas where extra fire-resistance is needed such as in elevator shaft walls and area separation firewalls, typically in commercial buildings.

Summary of Fire-Resistant Drywall Types

Drywall Type Thickness Fire Rating Comments
Type C Drywall 1/2" (12.7mm)
or
5/8" (15.9mm)
1-hour Improved Type X

More fiberglass
Type X Drywall 5/8" (15.9mm) 1-hour  
Type X Shaftliner Drywall 1" (24.5 mm) 1-hour+ Notes 5, 6

Notes to the table above

  1. Source: CertainTeed Corp. "Types of Fire Rated Gypsum", CertainTeed Corporation, retrieved 2021/07/17 original source: https://www.certainteed.com/drywall/what-fire-rated-gypsum/
    (2016)
    CertainTeed TYPE C GYPSUM BOARD PRODUCT DATA [PDF] (2016) CertainTeed Corporation P.O. Box 860 Valley Forge, PA 19482 USA Tel: Professional: 800-233-8990 Consumer: 800-782-8777 Website: www.certainteed.com , retrieved 2021/07/17 original source: https://www.certainteed.com/resources/CTG_TypeC_Eng.pdf

    Excerpt: CertainTeed Type C Gypsum Board is an interior gypsum board consisting of a solid set, fire-resistive, Type C gypsum core enclosed in ivory-colored face paper and a strong liner back paper. CertainTeed Type C board features a specially formulated Type X core providing superior fire performance when used in specific fire-rated Type C assemblies. Long edges are slightly tapered, allowing joints to be reinforced and concealed with joint tape and joint compound.

    CertainTeed TYPE X GYPSUM BOARD PRODUCT DATA [PDF] (2017) CertainTeed, Op. Cit., retrieved 2021/07/17 original source: https://www.certainteed.com/resources/CTG_2337_TypeX_%20DSS_EN.pdf

    Excerpt: CertainTeed Type X Gypsum Board is an interior gypsum board consisting of a solid set, fire-resistive, Type X gypsum core enclosed in ivory-colored face paper and a strong liner back paper. CertainTeed Type X board features a specially formulated core providing fire resistance ratings when used in tested assemblies. Long edges are slightly tapered, allowing joints to be reinforced../interiors/Drywall-Manufacturer-Identification-Stamps.php#CertainTeedand concealed with joint tape and joint compound.

    CertainTeed M2Tech SHAFTLINER TYPE X GYPSUM BOARD PRODUCT DATA [PDF] (2009) CertainTeed Corporation P.O. Box 860 Valley Forge, PA 19482 USA Tel: Professional: 800-233-8990 Consumer: 800-782-8777 Website: www.certainteed.com , retrieved 2021/07/17 original source: https://www.certainteed.com/resources/CTG_CT012_M2TechShaft_E.pdf

    CertainTeed FIREWALLS INFORMATION for Canada [PDF] CertainTeed, Op. Cit., retrieved 2021/07/17 original source: https://www.certainteed.com/resources/CTG-2950 Firewalls Info Sheet E R2-14-FINAL.pdf
    Excerpt:
    M2Tech® technology combines a specially formulated, fire resistive noncombustible core, enclosed in a moisture and mould resistant paper which is 100% recycled with double beveled edges for ease of installation. M2Tech achieves a score of 10 for mould resistance as per ASTM D3273, the best possible scores for these tests.

    Note that CertainTeed and probably other drywall manufacturers provide additional product data sheets and environmental products declarations offering varying details describing their products produced by different manufacturing facilities in different locations and serving different countries, states or in Canada, provinces.

    Example:

    CertainTeed TYPE X GYPSUM BOARD ENVIRONMENTAL PRODUCT DECLARATION [PDF] (2015) for CertainTeed Gypsum manufacturing facilities based at Toronto, Ontario, Canada, retrieved 2021/07/17 original source: https://www.certainteed.com/resources/CTG_TypeX_EPD_Toronto.pdf
  2. Typical 1-hour fire-rated wall construction:

    Type X or Type C drywall installed on both sides of 2x4 (nom.) wood stud walls 16" o.c. or 3 5/8" steel stud walls 24" o.c. as per various building codes
  3. Typical residential locations requiring fire-rated walls/ceilings

    include around boiler or furnace rooms, rooms locating a wood stove or coal stove, and on the common wall and adjacent ceiling of garages attached to living space
  4. Typical commercial locations requiring fire-rated walls/ceilings

     include most building walls where fire partitions or assemblies are specified, particularly stairwells, fire separation walls, etc.
  5. Shaftwall drywall system Codes / Standards:

    ASTM C1396, C475, C645, C754, C840, C1002, C1047, E84, E119; CAN/ULC-S101, CAN/ULC-S102, CAN/CSA-A82.27, GA-600, GA-216, GA-238; UL U417, ULC W446; ICBO ES ER-3579; NER-506; ICBO ES ER-4924
  6. Area Separation Firewall System Codes / Standards:

    ASTM C1396, C475, C645, C754, C840, C1002, C1047, E84, E119; CAN/ULC-S101, CAN/ULC-S102, CAN/CSA-A82.27, GA-600, GA-216, GA-238; UL U366, ULC W311
  7. Additional Fire Resistant Drywall Identification - paper colors:

    besides from the identifying stampings or labeling cited above on this page include the color of the paper covering the drywall sides
    • CertainTeed Type C fire resistant drywall paper: solid set, fire-resistive, Type C gypsum core enclosed in ivory-colored face paper and a strong liner back paper.
    • CertainTeed Type X Gypsum Board paper: solid set, fire-resistive, Type X gypsum core enclosed in ivory-colored face paper and a strong liner back paper.
    • CertainTeed Type X Shaftliner paper: Heavy moisture and mold resistant light blue-grey colored face and back paper

...

Fire Resistant Drywall: Underwriters Laboratory Drywall Stamp

Below: an Underwriters Laboratories wallboard fire-rating stamp

US Gypsum drywall stamp © Daniel Friedman

See details at

...


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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2023-06-27 by InspectApedia Publisher - Home renovation history, building permits, and other details can confirm drywall age

@Worried co,

For a 1963 house the age of the drywall itself could be anywhere from early 1960s to recent, depending on the renovation history of the home.

When we remove existing drywall, IF there are no other older fastener holes or marks in the studs or joists to which the drywall was secured, I think that it's reasonable to guess that the drywall we removed was original.

You can easily spot older drywall nail or screw holes in wall studs or ceiling joists by noticing that as you remove drywall to expose wood framing you see nail or screw holes in the wood that do not match the fasteners in the present drywall that you're removing.

That can tell us that the present drywall is newer than the home.

Home renovation history, building permits, and other details can confirm that guess.

Treat the drywall and joint compound used on it as presumed to contain asbestos - or have samples tested.

Get some help for stress - most likely, the health hazard from stress over this far exceeds the health risk from the drywall.

Simply avoid making a dusty mess, or if you have to clean up drywall dust use damp wiping and HEPA vacuuming.

On 2023-06-27 by Worried co

Sorry, very stressful.
House was built in 1963. DENVER suburbs. First comment photo is drywall in a basement bathroom. Next two are from a basement bedroom. Single family residence.

Not sure about renovations but our neighbor said that the house was flipped prior the the last owner who purchased in 2003. Thank you

On 2023-06-27 by InspectApedia Publisher - Republic Gypsum Company drywall

@Worried co,

@Worried co,

Those alpha-numeric stamps are probably production lot and date codes and don't identify the manufacturer, nor can we be certain of the date from just the codes, as how the codes are formulated are not entirely standard across manufacturers.

It would be invaluable if you could find another section of drywall end tape that shows the missing letters torn off preceding " ... of REPUBLIC HOUSING CORPORATION"

Key questions in answering your question "does this drywall contain asbestos" include:

Where is your building?

What sort is it? Is it manufactured housing?

What is the building age?

Also read ASBESTOS in DRYWALL inspectapedia.com/hazmat/Asbestos_in_Drywall.php

I think that The Republic Housing Corporation was a mobile home manufacturer, incorporated in Delaware but headquartered in Dallas Texas and who produced mobile homes up to 1974.

The Republic Housing Corporation was the parent company of Republic Gypsum, so I think that's the missing data from your drywall.

If that's the case and if the age of your building makes it likely that your structure was built before the 1980s then the drywall may indeed contain asbestos.

Bottom line:

Because the Republic Gypsum Company remained in business at least up to 2002, we need to know your building age.

For other readers - the company's trading name included American Gypsum.

REPUBLIC GYPSUM COMPANY LP (trading name, 2001-01-11 - 2002-01-23)
AMERICAN GYPSUM COMPANY (trading name, 2001-06-06 - )

On 2023-06-27 by Worried co

Hello, I recently had some water damage to my basement and am trying to identify some drywall the only stamp I can see says 050276D17. Is there a way to know if this is an asbestos problem?

Republic Gypsum drywall (C) InspectApedia.com Worried Co ... Republic Gypsum drywall (C) InspectApedia.com Worried Co

House was built in 1963. Here are some other photos of drywall from a different room. Any information about either piece would be greatly appreciated.

Republic Gypsum drywall (C) InspectApedia.com Worried Co

On 2023-03-29 by InspectApedia Publisher

@Al,

I'm sorry but we cannot tell the date of your drywall from that stamp.

If it were manufactured in the nineties it would not contain asbestos.

A prudent step would be to presume that the drywall and joint. compound used at joints end covering screws or nails may contain asbestos.

The simple presence of those materials is not a measurable hazard in your home.

Only if you were planning demolition or disturbance of the material need you either treat it as containing asbestos or have representative samples tested.

For small jobs it's more prudent to treat the material as containing asbestos than to pay the cost of the asbestos test.

Let me know if you have further questions.

On 2023-03-29 by Al

I'm wondering if you can identify if this product would have be containing asbestos in it. The house was built in the 50-60's and remodeled in the 90's but I don't know if the drywall seen in this photo is original or changed.

I believe the stamp says Factory Mutual Research Corporation Audit Inspection Program and you can see GB-3 in the bottom corner, maybe denoting Gold Bond - 3 Drywall?

gypsum wallboard (C) InspectApedia.com Al

Here is another photo showing what I believe to be the date stamp. I'm assuming its manufacturered in the 90's but who knows

gypsum wallboard (C) InspectApedia.com Al

On 2023-02-24 by InspectApedia Editor

@1973 home,

Of course, from one message, we don't know much about your building construction or location, just its age.

That looks more like a production date code, not easily mapped to a specific vendor.

Unless there are additional markings you can find, what you can do is to pay attention to other contextual clues as discussed above on this page.

You can also review the asbestos drywall ID & advice at

ASBESTOS in DRYWALL
https://inspectapedia.com/hazmat/Asbestos_in_Drywall.php

On 2023-02-24 by 1973 home

I came across this website and I just wanted to get more info on asbestos. I have this well that’s visible and I want to decipher the date on It.

drywall stamp (C) InspectApedia.com 1973 home

On 2023-01-13 by InspectApedia Publisher - drywall date and production codes are not standardized

@Anonymous by private email,

What's indeed confusing is that while there's been a lot of talk about standardizing date and production codes, they're not.

If you thought the house was renovated around 2006 your guess would, still, be reasonable.

On 2023-01-13 by Anonymous by private email (mod)

Hey I asked a question about some ceiling tiles a few weeks ago, thanks for the response. Doing a remodel south of Branson mo, moved on to the drywall upstairs.

There is a number on the back but I’m not sure how to decipher. Best guess so far 42nd week of 2006. House was built in the late 70 s. Thanks in advance - Anonymous, Sep 19, 2022

drywall stamp (C) InspectApedia.com Anon

...

drywall stamp (C) InspectApedia.com Anon

On 2022-12-29 by InspectApedia Publisher - 1963 Minnesota home with US Gypsum Company drywall

@Jakson,

Perhaps US Gypsum Company.

See if you can find remnants of paper end tapes at the ends of drywall segments. Those often have additional imprinted data that can identify the brand.

On 2022-12-29 by Jakson

Our house in Minnesota was built in '63. The piece with the most words I could find said "... GYPSUM COMPANY" with red and blue stripes underneath.

The attached pic is the stamp I found on the back of the drywall, but couldn't find anything online to decipher. I sent in a piece of the drywall for an asbestos test and the result was negative.

1963 Minnesota home gypsum company drywall (C) InspectApedia.com Jakson

On 2022-10-12 by InspectApedia-911 (mod) - Is there a database with drywall stamps?

@Dzutski,

Yes, the page above is a growing database of drywall stocks and different classifications and ratings.

You can see that your drywall which is only 1/4 in part of a wall or ceiling assembly but we can't see any more of the structure so can't comment on how the assembly might have been fire rated. Certainly in modern construction, quarter inch thick drywall would not be likely to be considered a significant fire break.

On 2022-10-12 by Dzutski

Looking to identify this panel, was part of a supposed rated wall assembly, likely at least 35 years old, 3 5/8" steel studs. This sheet (photo attached) against studs; and a 1/2" sheet we couldn't access stamps without additionally removing and entire sheet. Is there a database with these stamps? Anyone able to identify if this sheet (1/4") is part of a rated assembly?

rated wallboard (C) InspectApedia.com Dzutski

On 2022-10-10 by InspectApedia-911 (mod)

@Chad A,

CertainTeed Corp. partnered with French Compagnie Saint-Gobain in 1967 and was purchased by Saint Gobain in 1988.

That may be a clue.

On 2022-10-09 by Chad A

Hello, trying to identify this drywall in a house we recently purchased in Cookeville, TN. House built in 2007. The only identifying marks I can find are: 850 2 100% recycled paper SINCE 1967

Certainteed St. Gobain drywall (C) InspectApedia.com Chad

On 2022-09-15 by InspectApedia-911 (mod) - Is there a allowable substitute for type x drywall that is acceptable code-wise for fire resistant subfloor/framing?

@Roar,

I'm afraid I may not have a clear understanding of your question.

We wouldn't expect a layer of gypsum board to be part of the floor a subfloor layer in a building.

But I would expect drywall to be on the ceiling of the basement below.

In residential construction ordinary drywall will normally be what the building inspector would want on walks and ceilings.

I'm not sure why you're looking for fire rated drywall on a basement ceiling unless you're speaking about a mechanical room or Boiler Room where there are oil or gas fired Heating appliances.

On 2022-09-15 by Roar

Is there a allowable substitute for type x drywall that is acceptable code-wise for fire resistant subfloor/framing between a living area and basement in a residential new build? Thank you.

On 2022-09-13 by InspectApedia-911 (mod) - 2022 guide to contemporary gypsum board types and identification codes

Readers:

For a more recent guide to gypsum board types and identification codes see

GYPSUM PANEL PRODUCTS TYPES, USES, SIZES, AND STANDARDS [PDF] (2022) US Gypsum Association, 6525 Belcrest Road, Ste 480 Hyattsville, MD 20782 USA, Tel: 301-277-8686 Web: www.gypsum.org - retrieved 2022/09/13, original source: https://www.gypsum.org/wp-content/uploads/2011/11/223-04.pdf

And for the older standard see

GYPSUM PANEL PRODUCTS TYPES, USES, SIZES, AND STANDARDS [PDF] (2017) USGA, Op. Cit., - retrieved 2022/09/13,original source https://www.americangypsum.com/sites/default/files/2022-01/ga-223_gypsum_panel_products_types_uses_sizes_and_standards.pdf

Members in 2017:

On 2022-09-13 by InspectApedia-911 (mod) - Type VI fire rated gypsum board

@Craig Kafura,

Type VI gypsum board meets U.S. Federal Standard SS-L-30D describing specific intended uses such as for interior walls and ceilings, plasterbase, fire resistant plasterboard intended to receive 1 or 2 coats of veneer plaster as its finished surface. That is also a fire-rated gypsum board, as we see in the text of the stamp itself as well.

Please tell us

- the location of your building: country and city
- the age of your building
- whether or not you have observed that the interior (room) side of the plaster board whose stamp you show is in fact coated with plaster.

On 2022-09-13 by Craig Kafura

Hi - I found this within the chimney chase of my home built in the mid 1980s. I am wondering what type VI wall board is.? The type A chimney pipe is almost touching it.

Type VI fire rated gypsum board (C) InspectApedia.com Craig

On 2022-08-02 by InspectApedia-911 (mod) - clues for dating wallboard

@KJ,

Sure,

And a bit more in the article above.

Also try the page search box to find our article series

AGE OF BUILDING

On 2022-08-02 by KJ

I am trying to figure out how old this wallboard is, but I do not see the code. Are there any other clues I can cross reference to get an idea?

UL fire rated wallboard (C) InspectApedia.com KJ

On 2022-07-20 by InspectApedia-911 (mod)

@Daniel R,

Thanks for the photos and question. We'll research further but I think that is a date code not a brand.

On 2022-07-19 by Daniel R

Does anyone have any information on this drywall? It is being removed from a home in Georgia. The home was built in 1961. I can't find anything on it. It is labeled with 215NWP

On 2022-07-16 by InspectApedia-911 (mod) - Murphy water-repellent board

@Kris E,

It would be quite helpful for questions like yours if you could tell us

- the building location: country and city

- the building age

- any guesses at age of the drywall

There is a current Murphy Wall Products company (since 2007) providing drywall materials (and paints)
Murphy Wall Products
201 NE 21st ST
Fort Worth, TX 76164

But if your MURPHY Water-Repellent board or drywall is much older it's from another source.

On 2022-07-13 by Kris E

Any input on this material and potential for asbestos? These are from the same site but look different. Material has some fibers.

On 2022-05-05 by Inspectapedia Com Moderator - how to decode older or non-conforming drywall stamps

@Sly Bryjak,

Near the top of this article please review our suggestions in the section titled

How to Decode Older or Non-Conforming Drywall Stamps

where we've added the following:

If using the 2017-and-later drywall date stamp decoder just above does not give sensible results then to proceed you will need to

Provide contextual information that helps check the reasonableness of any guess at the drywalls stamp by trying to decode the numbers and letters, provided by

DRYWALL STAMP DECODING by CONTEXTUAL CLUES https://inspectapedia.com/interiors/Drywall-Type-Identification-Stamps.php#Context

and where we use your drywall number 07226505112

as an example

On 2022-05-05 by Sly Bryjak

Hello i got this Number on back of my drywall anyone knows when it was manufactured
07226505112
Thank you

On 2022-03-01 by Inspectapedia Com Moderator

Seth

Thank you for the discussion - now copied to

https://inspectapedia.com/interiors/Drywall-Manufacturer-Identification-Stamps.php#USG

US GYPSUM DRYWALL STAMPS - on this page

It would be helpful to have a sanity check on the age guess: tell us the country and city of location of the building and the building's age or year of construction.

On 2021-12-13 by Inspectapedia Com Moderator - Drywall Stamp 0104432025

@Michelle,

That's a common production date stamp but not a drywall manufacturer identification stamp.

Try looking for remains of edge tape on the drywall short ends, or for other manufacturer's stamps.

Please tell us the country and city of location of your building and when it was constructed.

On 2021-12-13 by Michelle

Hello, I'm trying to identify this drywall found in my home. It does not appear to have any letters on this code so I'm not quite sure how to identify it.

On 2021-12-06 by (mod) - Drywall production date code 032583602M4

@Stephen schmidt,

That looks like a production date code, not easily mapped to a specific vendor.

You will want to review the asbestos drywall ID & advice at

ASBESTOS in DRYWALL https://inspectapedia.com/hazmat/Asbestos_in_Drywall.php

On 2021-12-06 by Stephen schmidt

Nedd help identifying drywall code and if it contains asbestos.

On 2021-11-10 by Inspectapedia Com Moderator - Type C Wallboard identification stamp

@Stephen klch,

Most likely you wouldn't be able to see asbestos fibers. Fiberglass fibers would be easier to see. Please take a look at

ASBESTOS in DRYWALL

https://inspectapedia.com/hazmat/Asbestos_in_Drywall.php

On 2021-11-09 by Stephen klch

Was ripping out a bathroom and noticed the fibers in the sheet rock. Looked very similar to the new sheet rock we where putting in. But as soon as I noticed the fibers I had masked up and took precaution if it is asbestos.

It’s walla board type-c fire resistant. Pix attached

On 2021-11-06 by Inspectapedia Com Moderator - Drywall dated 04/02/21

@Karenkelly1989,

I see by the American Drywall Association stamp and a date stamp that's probably the production date.

With just that data I can not identify the manufacturer;

perhaps you can find some additional text all the drywall.

On 2021-11-06 by Karenkelly1989 - Certainteed drywall edge tape date stamp

Can someone identify this board ? I believe this to be centainteed board. Date stamped year 04 month 02 and date 21. Can someone confirm this to be correct?

On 2021-10-11 by inspectapedia.com.moderator - Drywall stamp F9M16N9

@Andy,

That's probably a manufacturer's production date stamp which usually will decode to identify a specific manufacturing plant as well. Those codes are not standard across the industry.

Unfortunately, with just the production date stamp and no other information, we can't make a useful guess about who the manufacturer was.

On 2021-10-08 by Andy

The only information on my drywall is this stamp " F9M16N9 ". The drywall is in a home built in 1969 in Iowa. The stamp is found on every 4' x 8' sheet that I have checked. Does this stamp tell who the manufacturer is, or the model of drywall, or a date of manufacture ?

On 2021-08-26 by inspectapedia.com.moderator - Certainteed as example of drywall production date code stamp de-coding: 12 10 7 W 10 M

Certainteed drywall date and production code stamp decoder - CertainTeed corp. cited and discussed at InspectApedia.com@Phyllis,

Without knowing the manufacturer we can only guess - since manufacturers may vary in how the use production date codes.

Look for another identifying stamp, or if the ends of drywall are visible anywhere, look at the paper end-tape to identify the product manufacturer and specific item.

But a typical drywall manufacturing date code format interpretation for your data would be as follows:

12 = Month: December

10 = Day: 10th

7 = year: 2007

W 10 M = plant code and production time, such as "Washington 10 AM Production Line "M"

Above is an example of one of these contemporary Drywall date code translations provided by Certainteed at www.certainteed.com/drywall/how-do-i-identify-board-i-am-using-how-can-i-tell-who-manufacturer-and-when-it-was-made/

Other manufacturers use similar but not necessarily identical production date and time stamp formats, as we describe above on this page.

On 2021-08-26 by Phyllis - sheetrock code number decoding: 12 10 7 W 10 M

Code number on sheetrock
12 10 7 W 10 M

Doesn't conform to the code as mentioned. Do you have any reference to manufacturing date
Thank you



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