This article identifies US Gypsum drywall, gypsum board Sheetrock® products that contained asbestos and provides supporting research and hazard management advice.

Page top illustration: this shows contemporary end-tape identification markings found on US Gypsum's Sheetrock® brand gypsum board. These products do not contain asbestos, but older gypsum board often did.

Asbestos in USG Sheetrock / Drywall to 1976

Note that while USG owns the Sheetrock™ trademark the use of that term is also widespread as a generic term for gypsum board or drywall. The image of a 1920's Sheetrock Ad shows the US Gypsum company's information.

Also note that USG Sheetrock and related products currently sold around the world do not contain asbestos.

[Click to enlarge any image]

At ASBESTOS PRODUCING COMPANIES & TRUSTS we note that United States Gypsum, US Gypsum, now USG, or U.S. Gypsum, or USG - asbestos cement products produced between 1920 - 1976, USG, founded in 1901, produced a wide range of building products that contained asbestos between 1920 and 1978.

These included USG gypsum board products, among them U.S. Gypsum fire-resistant drywall, joint compound, and the following USG products listed by product name:

• USG Hi-Lite Acoustical Plaster
• USG Durabond joint compound
• USG Exterior Textured Wallboard Finish
• USG Imperial Plaster
• USG Joint Compound
• USG K-Fac Block Insulating Coating
• USG Perf-A-Tape joint cement
• USG Plaster, USG Acoustical plaster
• USG QT Spray textured coating
• USG Red Top Plaster
• USG Textolite spackling putty
• US Gypsum or USG Roof shingles
• USG Sabinite plaster
• USG Textured paints, including USG Textolite, USG Textone, USG "Sheetrock" Textured coating
  

US Gypsum's asbestos-free joint compound patented in 1975 and cited below.

US Gypsum Plaster Products Also Contained Asbestos

U.S. Gypsum plaster and plasterboard products including

US Gypsum Cement Regular Plaster,

USG Firecode plaster,

USG Imperial plaster,

USG Red-Top™ Cementious plaster (1920-1958) and

USG RedTop™ Gypsum-based plaster (1920-1958),


USG RedTop™ Firecode™ plaster (probably a higher asbestos content, 1962-1969),

USG Gypsum Structolite (1950-1975),

USG Mineral-based Cafco Sound-Shield™,

USG Structo-Lite-Perlited Gypsum™ plaster (also see Perlite discussed

at PERLITE INSULATION

US Gypsum produced other building products that contained asbestos including roofing shingles and exterior siding in shingle form and as asbestos-cement shingle siding.

Also see ASBESTOS CEMENT PRODUCTS

Also see ASBESTOS in PLASTER

USG US Gypsum Sheetrock Gypsum Board Products Asbestos Research

Below: a United States Gypsum drywall stamp from an older home.

• FIBEROCK® [PDF] Brand Gypsum Fiber Underlayment - (US Gypsum) MSDS
• FIBEROCK® [PDF] Brand Abuse-Resistant Gypsum Fiber Panels (US Gypsum) MSDS
• FIBEROCK® [PDF] Brand Gypsum Fiber Sheathing Panels (US Gypsum) MSDS
• FIBEROCK AQUA TOUGH ® [PDF] Brand Aqua-Tough™Interior Panels (US Gypsum) MSDS
• SHEETROCL® MSDS [PDF] Brand Gypsum Panels (US Gypsum) MSDS
• SHEETROCK® HUMITEK MSDS [PDF] Gypsum Liner Panels (US Gypsum) MSDS
• USG US GYPSUM MANUFACTURING LOCATIONS [PDF] US Gypsum, retrieved 2021/07/07 original source: https://www.usg.com/content/usgcom/en/about-usg/worldwide-locations/manufacturing-locations.html
  
  This document lists USG facilities around the world and identifies what products are made, but does not include plant codes.
• "HEAT-INSULATING MATERIAL AND METHOD OF MAKING SAME." U.S. Patent Application 1/230,297, filed August 18, 1916.

Below, most of these patents are assigned to US Gypsum Co., some of whose products contained asbestos.

• Hite, Charles E. HEAT-INSULATING MATERIAL AND METHOD OF MAKING SAME [PDF] U.S. Patent 1,230,297, issued June 19, 1917. This patent is also cited in later (non-asbestos) USG patents such as US20100061180A1 2010-03-11 & US8262820B2 2012-09-11
  
  This is a Beaverboard patent:
  Excerpts:
  
  My invention relates to an improved heat insulating material and the method of making same. The object is to provide an improved insulating material, suitable for covering steam and hot and
  cold water pipes, refrigerating machinery, boilers and furnaces, and for numerous other uses requiring insulation of high efiiciency, which is non-combustible, durable and light in weight.
  ...
  Among the best insulating mediums or materials now in use, may be mentioned hair felt, cork, carbonate of magnesia and asbestos. These materials are expensive, and each has certain disadvantages.
  ...
  This mass of carbo-hydrate, water and sulfate, is at first quite fluid, but soon sets and becomes firm.
  
  The action of the carbohydrate paste is to hold the particles of sulfate in suspension, preventing settling until the sulfate hardens, then on the evaporation of the water, a substance is produced full of air cells, which has proved of greater insulating efficiency, as above stated, than insulating substances composed of 85% carbonate of magnesia and 15% asbestos.
• USG FIREPROOF GYPSUM WALLBOARD TECHNICAL INFORMATION (1952) [PDF] - retrieved 2022/06/16 original source: us.archive.org (the original and very large PDF file contained technical details about all US Gypsum products in 1952). Below we list these as separate product categories each of which is provided as a separate PDF document.
  Excerpts:
  DESCRIPTION:
  
  SHEETROCK® gypsum wallboard is composed essentially of a gypsum core encased in tough paper: a heavy manilla finished sheet on the face side and a strong liner paper on the back side. The long edges are recessed to form a shallow channel for embedding and conceling the joint reinforcement.
  
  SHEETROCK is als manufactured with square or beveled edges, to be used where paneled effects or featured joints are required.
  
  US Gypsum's Woodgrained Sheetrock was sold in a standard 3/8" thickness with beveled edges for Bleached Mahogany and square edges for Knotty Pine and Planked Walnut.
  
  The product used a special paper printed with photographic reproductions of carefully selected knotty pine, walnut, and mahogany panels ... laminated to the face of regular SHEETROCK wallboard ... [note that joints were not taped and were required to fall atop wood framing members - Ed.]
  
  Insulating Sheetrock is regular sheetrock which has a sheet of bright aluminum foil securely attached to its back surface.
  
  Fire Ratings for USG Sheetrock in this document are detailed beginning on page. 10.
  
  This document also gives detailed descriptions of these USG products:
  
  Sheetrock laminated wallboard
  
  Perf-A-Tape Joint System
  
  Woodgrained Sheetrock Wallboard
  
  Other Catalogs and USG Technical Specifications from 1952 and that were in the original archived file are given below, now available as individual documents.
  
  USG TEXOLITE PAINT PRODUCTS [PDF] - also see CEILING PAINT TEXTURED / POPCORN ASBESTOS
  
  USG WEATHERWOOD STRUCTURAL INSULATING SHEATHING [PDF] - also see USG US GYPSUM INSULATING SHEATHING ASBESTOS
  
  USG SOUND CONTROL PRODUCTS [PDF] (including Acoustone, Motif'D Acoustone, Auditone, Perfatone ceiling tiles) - also see US GYPSUM CEILING TILES
  
  USG EXTERIOR SHEATHING [PDF] a fireproof gypsum sheathing material made in 2' x 8' x 1/2" panels with a "new type water-resistant "asphalted" gypsum core enclosed in a specially treated, water-repellent, heavy black paper. The long edges are V-tongued and grooved. The gypsum core is incombustible and will not communicate high temperatures until completely calcined - a slow process
  
  - also see USG US GYPSUM INSULATING SHEATHING ASBESTOS
  
  USG SHEETROCK PYROFILL ROOF DECKS [PDF] - US Gypsum Insulating Pyrofill & USG Asbestos Board Pyrofill & USG Acoustical Pyrofill product descriptions, specifications, installation details, from USG 1952 Technical Specifications describe the the following product descriptions excerpted from a more-complete list found in the document:
  
  SHEETROCK PYROFILL USG Insulation PYROFILL an Asbestos Board Pyrofill roof decks are reinforced gypsum concrete (Pyrofill) slabs poured in place over permanent formboards of SHEETROCK, USG Insulation, or asbestos cement boards.
  
  SHEETROCK Formboard is a rigid type gypsum board, 1/2" thick by 32" wide (or 48" wide), and made to specified lengths to fit purlin spacings. Treated to resist mildew effectively. Federal Specifications SS-W-51a. Type A and ASTM C36-50.
  
  USG Insulation Formboard is a rigid type wood fiber insulation board, 1" thick, 32" wide (or 48" wide), and cut to specified lengths to fit purlin spacings. Treated to resist mildew effectively. Federal Specification LLL-F-321b.
  
  ASBESTOS-CEMENT Formboard is a rigid industrial type asbestos cement board, 1/4" thick, cut to 32" wide by 48" long. Note: Abestos cement formboard is not manufactured or sold by USG.
  
  PYROFILL is a mill mixed gypsum concrete consisting of calcined gypsum and not more than 12 1/2% by weight of wood chips, shavings or fibers. It requires the addition of water only on the job. Complies with ASA-A59.1-1945.
  

Above: USG Sterling gypsum board product label citing USG Patents between 1911 and 1921 puts a floor under the earliest-date age of the building where this gypsum wallboard was installed - photo courtesy of InspectApedia.com reader Sonny.

• USG Sterling Drywall & Joint Compound
• Utzman, Clarence W. PLASTER-BOARD [PDF] U.S. Patent 1,383,249, issued June 28, 1921. Application filed by United States Gypsum Co
  
  This patent does include the word "asbestos" in the general product-type description only, not in the patent text body.
  
  E04C2/043 - Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
  (no details available)
  
• Armstrong, Morgan K. PLASTER BOARD [PDF] U.S. Patent 1,701,291, issued February 5, 1929. Application filed by United States Gypsum Co.
  
  This patent does include the word "asbestos" in the general product-type description only, not in the patent text body.
  
  E04C2/043 Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster

 

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Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2024-03-18 by Don

I was replacing the ceiling in an old single wide trailer and on the back of the drywall it said Blendtex patent pending?
Wondered if this product has asbestos?

On 2024-03-18 by InspectApedia DF (mod)

@Don,

If you could attach a photo of the stamp identifying a panel as Blendtex that would be very helpful (one photo per comment) as would be a sharp photo of the edge of that panel.

This would be helpful because historical documents from USG describing the company's Blendtex product from the 1950s indicates it's a wood fiber product not a gypsum board product, and it would be valuable to clear up that question.

Continuing: Blendex dates from the 1970s.

Blendex itself is described in patent disclosures as

"... polybutadiene rubbers such as Blendex™"

That's not an asbestos material.

Example, see

Datta, Pabitra, Nestor A. Arroyo, and Ronald N. Friel. "Conductive molding composition." U.S. Patent 4,378,310, issued March 29, 1983.

Excerpt:
BLENDEX 586, which is a three-component blend of polyvinyl chloride, a graft copolymer of acrylonitrile, styrene and polybutadiene, and a copolymer of alpha-methyl styrene and acrylonitrile, as described in U.S. Pat. No. 3,053,800.

There have been a wide range of applications of Blendex, even household cleaners.

You can read the original Blendex patent here

Grabowski, Thomas S., and Howard H. Irvin. "Blends of (1) polyvinylchloride,(2) a copolymer of polybutadiene, styrene and acrylonitrile and (3) a copolymer of acrylonitrile, styrene and alpha methyl styrene." U.S. Patent 3,053,800, issued September 11, 1962.

https://patents.google.com/patent/US3053800A/en?oq=U.S.+patent+3%2c053%2c800

Excerpt: This invention relates to polyvinyl chloride blends exhibiting new and unexpected properties. In one specific
aspect thereof, this invention relates to high impact poly vinyl chloride blends of high heat distortion temperature.

In another aspect thereof, this invention relates to high impact polyvinyl chloride blends of high heat distortion
temperature and high tensile strength. In an even more specific aspect thereof, this invention relates to high impact polyvinyl chloride blends of high heat distortion temperature, high tensile strength and high hardness.

Watch out: however your drywall and more likely the joint compound used in its installation sounds as if it's a 1970s or earlier product (given that the Blendex patent was pending in that data stamp and Blendex was Patented Sept. 11, 1962)

SO your drywall and joint compound might indeed contain asbestos.

On 2024-03-19 by Don

Here's a photo of the ceiling drywall with the BLENDTEX imprint.

[Minor editing by InspectApedia]

On 2024-03-19 by InspectApedia Publisher

@Don

About your asbestos worry, what I said above is all that one can say by way of advice and possible asbestos content in Blendtex unless or until we can find an actual product data sheet for your specific Blendtex product that looks, from your photo, like gypsum board or "drywall".

The earliest use I found of the brand name USG or US Gypsum Blendtex was from 1953 in "Full text of "USG technical information 1953." [PDF]

https://archive.org/stream/USGTechnicalInformation1953./USG%20technical%20information%201953._djvu.txt

also cited in a similar USG document from 1956 - both documents include the following text:

"“BLENDTEX”* insulation board, a blend of four tan tones. "
and
"BLENDTEX Insulating Plank "
and
""USG”, "BLENDTEX", "RED TOP", "SHEETROCK", "ROCKLATH" and "TEXOLITE", mentioned in this publication are registered trademarks owned by United
States Gypsum Company and are used by it to distinguish its products.

"USG" identifies the particular fiber insulation board; "BLENDTEX" identifies the particular fiber insulation board in variegated shades; "SHEETROCK" identifies
the particular gypsum wallboard; "ROCKLATH" identifies the particular gypsum plaster base; "TEXOLITE" identifies the particular case in flat paint manufactured only by United States Gypsum Company; "RED TOP" identifies the particular mineral wool sold only by United States Gypsum Company. "

At InspectApedia we have more information about Blendtex Drywall from US Gypsum - a 1950s - 1960s USG product - from a previous reader question and answer.

In the reader Q&A on this page, see

"On 2020-09-29 by (mod) - Asbestos in USG Blendtex Fire-Rated Drywall? US Gypsum Wallboard"

There we discuss the appearance of "Blendtex" on US Gypsum Drywall bearing a "Fire Rated" stamp - which could hint at the use of asbestos.

It would be appropriate - as is the case with drywall dust independent of an asbestos question - to avoid creating a dusty mess or to use damp wiping and HEPA vacuuming if you've already created dust from that material.

On 2024-03-19 by Don

@InspectApedia Publisher,

I sent in a sample today.

[For asbestos testing of Blendtex Gypsum Board Ceiling Panels]

On 2024-03-19 by InspectApedia Publisher

@Don

Very helpful - as this is an old product, widely used, including in mobile homes or trailers; please let me see a copy of the test results.

Keep in mind that because there can be asbestos in joint compound too, not just in the drywall panels, just where you collect a sample, and the thoroughness of the lab in examining it, are important.

On 2024-04-09 by InspectApedia Publisher

@Don

Here is a link to Don's asbestos lab test report that found no asbestos in this sample of Blendtex.

https://inspectapedia.com/hazmat/Blendtex-Asbestos-Test-Corrigan-Redact.pdf

On 2022-12-02 by Sonny - Sterling Gypsum Wallboard may contain asbestos

Tearing down an old store. Found this drywall everywhere. It's neat to be part of the buildings history, even if it is the end of the history.. but i was wondering if this is asbestos containing wallboard?

The adjacent building has been flagged as having asbestos in the insulation, and this drywall was covered in 1/4 paneling, so it may have evaded an inspection (if an inspection took place)....

I appreciate your response. Thank you.

[Click to enlarge any image]

It's located in fort Klamath Oregon, USA.. according to the Oregon Historical Sites database, the building was originally constructed in 1923, and a second construction took place in 1940.

On 2022-12-03 by InspectApedia (Editor) - Asbestos content in US Gypsum Sterling Gypsum Wallboard & Joint Compound

@Sonny,

Thank you for the photo, that's great. It would be helpful to know the country and city of location and to building age where this drywall was installed. I'll do some additional research as well.

Asbestos content in US Gypsum Sterling Gypsum Wallboard & Joint Compound

Fischbein et al. (1979) reported that four of 15 industrial taping and spackling compounds contained tremolite structures at concentrations ranging from 1 to 2% (Sterling Ready Mix, Sterling All-Purpose) to 8–12% (S-C-L Taping Compound) (Fischbein et al. 1979). (1) (2)

So there may well be asbestos in your drywall or at least at joints and other locations where joint compound was applied.

(1) Fischbein A, Rohl AN, Langer AM, Selikoff IJ. 1979. Drywall construction and asbestos exposure. Am Ind Hyg Assoc J. 40:402–407. [Taylor & Francis Online], [Web of Science ®], [Google Scholar]

(2) Jacobs, Neva FB, Kevin M. Towle, Brent L. Finley, and Shannon H. Gaffney. "An updated evaluation of potential health hazards associated with exposures to asbestos-containing drywall accessory products." Critical Reviews in Toxicology 49, no. 5 (2019): 430-444.

Copy at

inspectapedia.com/hazmat/Potential-health-hazards-associated-with-exposure-to-asbestos-containing-drywall-accessory-products-Jacobs.pdf

On 2020-09-29 by Anonymous - Blendtex U.S.G. Panels in an old mobile home?

In a old mobile home not sure the year but old I’m demolisheing it found the ceiling has this wall board on it
On the back it has this printed on the paper

U.S.G. Blendtex panel - flame spread rating - class A ?

Wondering about asbestos
Also on back

On 2020-09-29 by (mod) - Asbestos in USG Blendtex Fire-Rated Drywall? US Gypsum Wallboard

Photo above of older Blendtex Gypsum board from the ceiling of another mobile home is provided courtesy of reader Don, 2024/03/18.

Thank you for the helpful question about whether or not there's asbestos in USG Blendtex panels, Anon.

USG Blendtex is an old product, around since the 1930s and even appearing in some contemporary job specifications that we found by researching for "USG Blendtex product data sheet".

The Blendtex "Weatherwood" ceiling panel was advertised by US Gypsum in the December 1938 issue of Pencil Points [PDF] Reinhold Publishing Co., Stamford CT, - as you can read in this US Modernist PDF PDF1938

https://usmodernist.org/PA/PP-1938-12.pdf

[Click to enlarge any image]

Blendtex was advertised as an insulating ceiling panel, sold in this instance with a pre-finished wood-grained surface.

I see the UL stamp that you photographed and included on what's clearly a gypsum board.

The drywall in your photo is a USG product, U.S. Gypsum & Other Drywall / gypsum board from 1920 to at least 1976 often included asbestos - as noted

at
ASBESTOS in DRYWALL

If we can confirm that the drywall stamp for fire rating that you posted is on a U.S. Gypsum product that will let us add it to the collection

at DRYWALL TYPE IDENTIFICATION STAMPS

But if you could also attach a photo of the USG stamp identifying a panel as Blendtex that would be most helpful (one photo per comment) as would be a sharp photo of the edge or constituents of that panel.

I ask because historical documents from USG describing the company's Blendtex product from the 1950s indicates it's a wood fiber product not a gypsum board product, and it would be valuable to clear up that question.

Here's an excerpt:
DESCRIPTION

USG Decorative Insulation is rigid wood fiber insulating board made into predecorated interior wall and ceiling units. The products are fabricated from homogeneous mats manufactured of wood fiber produced from new timber.

There are two basic types of USG Decorative Insulation:

1. USG Insulating Twin-Tile and Panel-Tile—Square and rectangular patterns generally used for ceiling paneling.

2. USG Insulating Plank—Long, narrow, ceiling height units simulating vertical random wall planking.

For sizes, edges, etc., see data on page 4.

Colors:

“Hilite,” a light ivory solid color.

“BLENDTEX”* insulation board, a blend of four tan tones.

FUNCTION AND UTILITY

Decorative—Many designs and patterns are possible with combinations of random width plank and various sizes of tile — using either Hilite or BLENDTEX or both.

Insulating -The thickness, with a thermal conductance of 0.66, is equal to approximately 19" of stone concrete in resist ance to heat transfer.

Light Reflective Hilite color has a light reflection of 70 to 80 per cent. Light reflection of BLENDTEX ...

and here is what the company wrote about its fireproof gypsum board

Fireproof—Perforated ROCKLATH plaster base is especially useful where one hour fire resistive ratings are required. Gypsum plaster applied over perforated ROCKLATH, in addi tion to being “welded” to the surface, mushrooms through the
holes “riveting” the plaster to the lath. This added bond gives the higher fire rating of perforated ROCKLATH and plaster.

This information is provided, along with discussion of some asbestos-containing products

in US Gypsum's WALL & CEILING TECHNICAL INFORMATION [PDF] (1953) found at archive.org/details/USGTechnicalInformation1953./mode/2up

For a complete list of U.S. Gypsum or USG products that contained asbestos,

see US GYPSUM ASBESTOS-CONTAINING PRODUCTS

Question: does this USG "Woodgrained Sheetrock" fireproof gypsum board panel contain asbestos?

Does this USG fireproof sheetrock contain asbestos? - Capriceclassic 2022/06/16

Moderator reply:

Most likely, yes, as you'll see above on this page.

But it would sure be helpful if you'd include surrounding context information that would support an informed guess:

1. What are the country and city where your building is located?
2. When was the building constructed?

In any event thank you for a helpful question and photo.

On 2019-06-06 by Ryan - 1955 Woodgrained Sheetrock - Fireproof Gypsum Wallboard

Hello,
I cannot find any information on this specific type of sheetrock made by USG. I am concerned it contains asbestos (I understand i need to have it tested)
It is called Woodgrained Sheetrock - Fireproof Gypsum Wallboard - This would have been installed in 1955.

Please see the photo below. I was hoping someone has seen this product label from 1955 before and let me know if they know more about this product.

IMAGE LOST by older version of Comments code - now fixed. Please re-post the image if you can. Sorry. Mod.

This question was posted originally at DRYWALL TYPE IDENTIFICATION STAMPS

On 2019-06-06 by (mod) - Asbestos likely in 1955 Woodgrained Sheetrock - Fireproof Gypsum Wallboard

Ryan, take a look at the description of USG's woodgrained sheetrock and you'll see that it was fire rated and in the 1950s was likely to contain asbestos.

Question: does this drywall from the 1970's contain Asbestos? (Probably US Gypsum)

Apartment building with 16 units built 1970 and shortly thereafter. Oldest drywall/gypsum board is found in bathroom walls. Been having trouble breathing and coughing frequently. 10 year hvac tech so I’ve been around it on several occasions.

- Anonymous by private email 2019/05/09

Above: Type SCX R1319-417 Gypsum Board Issue No. F-1199 5/8" thick

Reply: either test or treat 1970's drywall and joint compound as PACM

IF you can find a manufacturer's ID stamp - besides those UL stamps that'd be helpful as would knowing the country and city where the drywall is installed.

But it looks like R1319-417 Gypsum Board Type SCX from the 1970's was a US Gypsum Product.

One of your products is 1/2" and the other 5/8" Drywall.

Drywall dust and other building dust and hundreds of other things can cause coughing - independent of any possible asbestos content. You should consult with your doctor about your cough.

Type C drywall had and has additives to improve fire-resistance; not all of those are asbestos.

But for a 1970's fire-resistant drywall for which we have no manufacturer ID and considering that asbestos was often in joint compound on such walls, it would be prudent to either test both the gypsum board itself and the joint compound at drywall tape joints OR to assume the material contains asbestos.

Above: Type C Drywall, R-1319 SP, 1/2" thickness includes a note: See U.L. Fire Resistance Index.

On 2017-04-25 by Kimberly - shiny fine fibers visible in 2005 sheetrock drywall

I recently moved into a new place and in a storage room on the ground floor there is some exposed Sheetrock/drywall? with the gypsum core exposed. The house was built in 2005 according to my boyfriend, so I'm not concerned about asbestos.

There are shiny fine fibers sticking out of the gypsum though, they're difficult to see without a light directly on them. Is this fiberglass? Something else? Some of it is crumbling and I store things in that room, should I be concerned?

On 2017-04-25 by (mod) - fiberglass fears in USG Sheetrock?

Kimberly,

Most-likely you're seeing fiberglass reinforcement of the gypsum board, referred to in the building trades as FRP or fiber-reinforced panels. Unless there is drywall debris getting all over your stored materials, what you describe is not likely to be a concern. Certainly you could, if bothered, just tape over the exposed edges using anything convenient, even wide blue masking tape.

These products have been around since at least the early 1990's (or on request we'll research patents to narrow the date range).

US Gypsum, producer of Sheetrock(R) brand gypsum board or drywall, produces Sheetrock(R) MoldTough(R) VHI (Very High Impact) gypsum board panels used in interiors. These panels use fiberglass reinforcement in the panel composition.

Another company, Georgia Pacific, produces DensGlass, a gold colored fiberglass-mat reinforced exterior sheathing board as well as DensArmor Plus, a fiberglass-reinforced gypsum board product that applies a fiberglass matt to both sides of the panel for improved moisture resistance.

...

Continue reading at ASBESTOS in DRYWALL, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see these

Recommended Articles

• ASBESTOS in DRYWALL
• ASBESTOS-DRYWALL REMEDIATION / REMOVAL
• ASBESTOS PRODUCING COMPANIES & TRUSTS
• DOES THIS MATERIAL CONTAIN ASBESTOS? - 5 easy questions to tell if a BUILDING MATERIAL probably contains asbestos -
• DRYWALL ASBESTOS CONTENT
• DRYWALL, FIBERBOARD, PLASTER INTERIORS
• DRYWALL & GYPSUM BOARD COMPOSITION & HISTORY
• DRYWALL TYPE IDENTIFICATION STAMPS
• NATIONAL GYPSUM DRYWALL ASBESTOS?
• US GYPSUM ASBESTOS-CONTAINING PRODUCTS
• US GYPSUM CEILING TILES
• US GYPSUM DRYWALL IDENTIFICATION STAMPS

Suggested citation for this web page

US GYPSUM SHEETROCK ASBESTOS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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