InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
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
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?
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.
Reader Question: Does this 1968-era Celo-Rok® Gypsum board contain asbestos?
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
Aside 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: http://archive.org/stream /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.
See ASBESTOS TESTING LAB LIST
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:
We have not found unequivocal data clearly stating the presence or absence of asbestos in interior gypsum board produced with the Celo-Roc brand
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 ?
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
Above / left: another photo of fiber-reinforced drywall from Celotex, provided by reader T.R. by private email 2017/11/08.
[Click to enlarge any image]
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
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
Damage that is rapid, ongoing, and costly
Disfunctional but needed systems like unreliable heat, electrical wiring, &c.
Continue reading at CELOTEX ASBESTOS PRODUCTS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia.
Ask a Question or Search InspectApedia
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
Celotex ceiling products division was purchased by Ceiling Products & Gypsum Wallboard (BPB) of the U.K. beginning in 1999
Celotex roofing products division was purchased by Certainteed Corporation (Valley Forge PA) beginning in 1999
 Certainteed Ceilings, Adagio fiberglass/mineral fiber composite acoustical ceiling product MSDS, web search 11/22/2011, original source: certainteed.com/resources/Adagio_MSDS_2010.pdf
 "Board of Education for the School District of the City of Detroit v. Celotex, et al., Circuit Court of Wayne County, Michigan, No. 84-429634-ND"
 Armstrong Corporation, web search 6/22/12, original source: http://www.armstrong.rs/commclgeu/eu1/uk/rs/FAQ_other.html, [Copy on file as Armstrong_Ceil_Asbestos.pdf]
 Lipsitz & Ponterio, LLC, "Carpenters and Mesothelioma", Lipsitz & Ponterio, LLC, 135 Delaware Ave, 5th Floor, Buffalo, NY 14202-2415 (716) 849-0701. Web search 6/22/12, original source: http://www.mesotheliomacarpenter.com/carpenters-asbestos-exposure/ceiling-tile/ [Copy on file as LiIpsitz_Asbestos.pdf]
 INACHI forum discussion about asbestos ceiling tiles, web search 6/22/12, original source: http://www.nachi.org/forum/f18/asbestos-ceiling-tiles-14709/ [Copy on file as Inach_Ceil_Asbestos.pdf]
 Celotex [UK] History, Celotex Insulation Specialists, web search 6/30/12, original source: http://www.celotex.co.uk/celotex-history [Copy on file as Celotex_History_UK.pdf ]
 Wikipedia provided background information about some topics discussed at this website provided this citation is also found in the same article along with a " retrieved on" date. NOTE: because Wikipedia entries are fluid and can be amended in real time, we cite the retrieval date of Wikipedia citations and we do not assert that the information found there is necessarily authoritative. Web search 6/30/12: "Ceiling Tiles"
 Brian Greer, "History of Tin Ceilings", Brian Greer's Tin Ceilings, web search 6/30/12, original source: http://www.tinceiling.com/company/historytin.php
 Armstrong Corporation, "Corporate History: a Historical Summary", web search 6/30/12, original source: http://www.armstrong.com/corporate/corporate-history.html
 "Ceilings Pressed in Time", Old House Journal, web search 6/30/12, original source: http://www.oldhousejournal.com/ceillings_pressed_in_time/magazine/1070
 Steven Mlynarek, Morton Corn, Charles Blake, "Asbestos Exposure of Building Maintenance Personnel", Regulatory Toxicology and Pharmacology, 23, 213–224 (1996) ARTICLE NO. 0045, http://library.certh.gr/libfiles/PDF/GEN-PAPYR-4810-ASBESTOS-by-MLYNAREK
 National Institute of Occupational Safety and Health (NIOSH) (1989). In NIOSH Manual of Analytical Methods (P. M. Eller, Ed.),
Method 7400. NIOSH, Washington, DC.
 U.S. Environmental Protection Agency (USEPA—Green Book) (1990). In Managing Asbestos in Place: A Building Owners Guide to Operations and Maintenance Programs for Asbestos-Containing
 U.S. Department of Labor, Occupational Safety and Health Administration (USDOL) (1994). In Occupational Exposure to Asbestos:
Final Rule, FR Vol. 59, No. 153:40964–41162. Materials, Report 2OT-2003. USEPA, Washington, DC.
 U.S. Department of Labor, Occupational Safety and Health Administration
(USDOL) (1986). In Occupational Exposure to Asbestos: Tremolite,
Anthophyllite, and Actinolite: Final Rule, FR Vol. 51,
 U.S. Environmental Protection Agency (USEPA) (1990). In Environmental Asbestos Assessment Manual, Superfund Method for the Determination of Asbestos in Ambient Air, Part 2, Technical Background Document, Report EPA/540/2-90/005 b. USEPA, Washington, DC
 Ceiling - Frequently Asked Questions, Armstrong Corporation, web search 6/30/12, original source: http://www.armstrong.com/resclgam/na/ceilings/en/us/article17697.html
 BPB America Inc.,
5301 West Cypress St., Suite 300,
Tampa, FL 33607,
Web: www.bpb-na.com. Acoustic ceiling tile & accessories.
 Affa Tile Company
No. 1116/8, Poonamalee High Road, Opposite Hotel Shan Royal, Koyambedu
Chennai, Tamil Nadu - 600 107, India, E-Mail: firstname.lastname@example.org website: http://www.affatiles.com Tel:044-24757498, 044 - 24757497
 Made-in-China.com, online sevice to connect buyers with product suppliers in China, web search 6/30/12
 "Directive 2003/18/EC of the European Parliament and of the Council of 27 March 2003 amending Council Directive 83/477/EEC on the protection of workers from the risks related to exposure to asbestos at work". Publications Office of the European Union. 27 March 2003 Web search 6/30/12, original source: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32003L0018:EN:NOT,
 H. M. Murray, testimony before the Departmental Committee on Compensation for Industrial Diseases "Minutes of Evidence, Appendices and Index", 1907. p. 127
 D. Auribault, "Note sur l'Hygiène et la Sécurité des Ouvriers dans les Filatures et Tissages d'Amianté (On hygiene and security of the workers in the spinning and weaving of asbestos)" in Le Bulletin de l'Inspection du Travail, 1906, pp 120–132.
 Wikipedia entry on Asbestos and various citations from that article, web search 6/30/12, original source: en.wikipedia.org "Asbestos"
Asbestos Identification and Testing References
Asbestos Identification, Walter C.McCrone, McCrone Research Institute, Chicago, IL.1987 ISBN 0-904962-11-3. Dr. McCrone literally "wrote the book" on asbestos identification procedures which formed
the basis for current work by asbestos identification laboratories.
Stanton, .F., et al., National Bureau of Standards Special Publication 506: 143-151
Pott, F., Staub-Reinhalf Luft 38, 486-490 (1978) cited by McCrone
Asbestos NESHAP ADEQUATELY WET ASBESTOS GUIDANCE, EPA340/1-90-019, December 1990, U.S. ENVIRONMENTAL PROTECTION AGENCY, Office of Air Quality Planning and Standards, Stationary Source Compliance Division, Washington, DC 20460,original web source: http://www.epa.gov/region04/air/asbestos/awet.htm
Asbestos products and their history and use in various building materials such as asphalt and vinyl flooring includes discussion which draws on ASBESTOS, ITS INDUSTRIAL APPLICATIONS, ROSATO 1959, D.V. Rosato, engineering consultant, Newton, MA, Reinhold Publishing, 1959 Library of Congress Catalog Card No.: 59-12535 (out of print, text and images available at InspectAPedia.com).
"Handling Asbestos-Containing roofing material - an update", Carl Good, NRCA Associate Executive Director, Professional Roofing, February 1992, p. 38-43
EPA Guidance for Controlling Asbestos-Containing Materials in buildings, NIAST, National Institute on Abatement Sciences & Technology, [republishing EPA public documents] 1985 ed., Exposure Evaluation Division, Office of Toxic Substances, Office of Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington,D.C. 20460
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: email@example.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones