Celotex Celo-Rok gypsum board (C) InspectApedia SQCelotex® Drywall / Wallboard Asbestos?

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Drywall / gypsum board products made by the Celotex corporation.

This article discusses how to identify Celotex drywall or wallboard products and answers questions about possible asbestos content in some Celotex wall and ceiling covering wallboard, drywall, gypsum board.

This article series assists building buyers, owners or inspectors who need to identify asbestos materials (or probable-asbestos) in buildings by simple visual inspection.

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Celotex™ Gypsum Board (drywall) products & asbestos content

Celotex tapered edge drywall gypsum board (C) InspectAPedia

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Reader Question: asbestos in Celotex Gypsum Board (drywall) 4X8 panels?

5/21/2014 Jesse said:

I am buying a house that has unused Celotex Gypsum Board (drywall) 4X8 panels in the basement... the owner has offered to leave them for me to use when I finish the basement, but I don't know if they contain asbestos and can't find an answer online.


Jesse if you refer to celo.rock gypsum panels, some of those may indeed contain asbestos. Use the CONTACT link found at the bottom of any InspectApedia web page to send me sharp photos of both sides and an edge of the product and of any stampings or markings and I can comment further.

On receipt of photo (above) This looks like a quite recent tapered edge product. If so it would not be expected to contain asbestos. Do you know when it was bought?

Reader follow-up:

The gentleman I'm buying it from says it is 10-15 years old... so '99-'04 would be my best guess. The house was built in '9.. so definitely bought after then.


sounds fine

Reader Question: Does this 1968-era Celo-Rok® Gypsum board contain asbestos?

Celotex Celo-Rok gypsum board (C) InspectApedia SQ Celotex Celo-Rok gypsum board (C) InspectApedia SQ

I was so happy to locate your site. We are remodeling our inherited mom's house and have a whole lot of drywall to replace. We really need to find out if it contains asbestos. I think I located the name of it on your site but it says 'May contain asbestos'. I have attached a couple of pictures in hopes that you could help identify and determine for us.

The drywall is Celotex Celo-Rok® gypsum board.

Thank you so much for any help you can provide. - Anon [by private email] 19 Sept 2015


Celo-Rok Catalog cover 1947 (C) InspectApediaAside from product labeling and visual appearance, it would be most helpful if we knew the age of the home and age of the wallboard or about when it was installed.

Certainly Celo-Rok products from the 1940's were advertised as containing asbestos in some of that product line. However your photographs, the paper taping edging on the drywall panels, and the blue ink numeric stamp all look to me like much more modern products than those from the 1940's.

Celotex Celo-Rok® gypsum products were widely sold in the 1940's. However from my reading of the advertised properties of Celotex products (from 1943) it is clear that the company did not explicitly name asbestos as an ingredient in all of its sheathing products.

In addition to the 1943 Celotex advertisement cited in this article, I note that an advertisement for books on asbestos cites and quotes a 1947 Celo-Rok product catalog produced by the Celotex Corporation [shown at left] that refers to "Wood or Asbestos Shingles" (the latter would have properly been called asbestos-cement shingles) as a roof covering beneath which a Celotex Celo-Rok roofing panel might be applied.

The use of the word "asbestos" in referring to roof shingles is perhaps a source of confusion about asbetos as an ingredient in Celo-Rok®.

Similarly, "How You Can Build Better Homes at Lower Cost", from the same era cites:

Important contributions to "Economy Home" construction are the new types of patented fasteners specially developed for
applying wood or asbestos shingles directly to Celotex Insulating Sheathing.

One section of Glen Oaks Village in Bellerose, Long Island, N.Y., built by Gross-Morton of Jamaic or L. I., N. Y. There are 3800 apartments in this huge, beautiful garden-type development. Celotex insulating Sheathing used throughout. C. A. Hemphill Associates, Evanston, Illinois, used Celotex Insulating Sheathing on these fine homes in Forest Glen subdivision, Winnetka, III. - retrieved 21 Sept 2015 original source: /HowYouCanBuildBetter HomesAtLowerCost/HowYouCanBuildBetterHomesAtLowerCost_djvu.txt

In the 1940's Celotex produced and marketed "Celo-Rok Anchor Lath" as a substitute for traditional wood lath in wall plastering applications. The company produced a "cane-board" lath product as well.

These texts do not cite asbestos in the sheathing or lath product itself.

I suspect that your gypsum wallboard does not contain asbestos, though I do not know that for a fact. My reasoning is that at least into the 1960's the use of asbestos in building products was considered a positive feature as it added both strength and fire resistance. It was common for a manufacturer to include asbestos and its properties in product literature and in product advertisements.

Bottom line: to know for certain if your specific Celo-Rok wallboard contains asbestos you'd need to send a sample to a certified asbestos testing lab.

As it's quite inexpensive, and as it could make a significant difference in the cost in an extensive renovation work where all drywall is being removed, I would have a lab test performed to confirm the presence or absence of asbestos in your 1960's vintage Celo-Roc. That's because:

  1. We have not found unequivocal data clearly stating the presence or absence of asbestos in interior gypsum board produced with the Celo-Roc brand
  2. If you found asbestos in a dust-creating material that was going to be removed during extensive demolition and that couldn't be removed with practically no debris and dust production, an asbestos-dust-containment job will be much more costly than straightforward demo of asbestos-free drywall.

If you take that action (about $50. U.S.) you can send me the bill and in any case I ask that you keep us informed of a test result as what you learn will help other readers.

Question: Age & Asbestos Content of Celotex drywall made in Tampa Florida ?

Celotex drywall manufactured in Tampa FL USA (C) NS Celotex drywall manufactured in Tampa FL USA (C) NS

I began renovating our basement and removed the old celotex drywall. I am wondering if it is possible to date it. I have attached a picture of the label. Any help would greatly be appreciated. We just purchased the house to find a number of issues hidden behind the drywall.

We are trying to determine if the previous owner installed the drywall and therefore knew about the foundation damage. I will try the company. - Anonymous by private email 2017/03/03

Reply: Celotex® Drywall with the UPC # 0 46788 00129 7 was tested to confirm no asbestos content

Celotex fiber reinforced drywall with UPC 0 46788 00129 7 (C) InspectApedia.comAbove / left: another photo of fiber-reinforced drywall from Celotex, provided by reader T.R. by private email 2017/11/08.

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The reader reports that the drywall with the Celotex drywall product UPC # 0 46788 00129 7 was in home constructed in the U.S. in 1978. The fiberglass fibers at the upper edge of the drywall are reported to be a mesh tape that was used on that drywall seam. (I thought that fiberglass mesh drywall tape was not in use until the 1980's - Ed.].

OPINION: based on the construction date of the home alone, and if no asbestos-content tests have been performed, it would be prudent to treat this drywall as presumed to contain asbestos but chances are it's not an asbestos-containing product.

After Celotex reorganized in 1997, BPB PLC of the United Kingdom bought Celotex’s ceiling products and gypsum wallboard operations in 2000.

Current gypsum insulating boards such as Celotex Saint-Gobain Plasterboard Insulation and possibly other Celotex Saint-Gobain sheathing products contain long fiberglass fibres and polyester polyols (produced from recycled plastics such as PET bottles) but would not be expected to contain asbestos. (More details are at CELOTEX HISTORY & PRODUCTS).

The company's current products include rigid polyisocyanurate (PIR) foam boards bonded to plasterboard, for use as insulating dry lining for internal wall applications in existing domestic and non-domestic buildings.

The reader T.R. reports that he has ordered an asbestos test for this material. The sample test results were negative for Asbestos using the EPA 600 test. - private email, anon to DF, 2017/11/08

Regarding the Florida reader's question above, sorry I can't date the drywall from the data given, though Celotex might be able to do so from the bar code or labeling details.

Also I see what looks like a bit of mold on your drywall.

If you haven't done so, a thorough inspection by a competent home inspector can help you set priorities of attention for both further exploration of the home and for its repairs.

For example, the asbestos hazard from drywall that's in place in the building may be trivial (so long a you avoid dusty demolition methods) while a large moldy drywall reservoir may be more dangerous. And there may be other completely-different topics that need attention, focusing first on


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