Asbestos containing acoustic ceiling tilesCatalog of Celotex® Insulating & Sheathing
products that contain asbestos or that are asbestos-free

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

Asbestos-containing products made by the Celotex corporation.

The following list names and comments on building products such as ceiling tiles and many other Celotex® brand building products & articles listed by some sources as believed to contain asbestos.

This article series assists building buyers, owners or inspectors who need to identify asbestos materials (or probable-asbestos) in buildings by simple visual inspection. We provide photographs and descriptive text of asbestos insulation and other asbestos-containing products to permit identification of definite, probable, or possible asbestos materials in buildings.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

Alphabetical list of Celotex™ insulating & other building products believed to contain or not contain asbestos

Celotex L-260 Mayfair Stipplied White 12x12 ceilign tile (C) reader Bruce Pederson 1960-1970

Photo: Celotex 12x12" ceiling tile installed late 1960's - early 1970's contributed by InspectApedia reader Bruce Pederson 2018-08-15.

[Click to enlarge any image]

Celo-Siding Celotex siding board (C) InspectApedia op cit 1943

Celotx cane board insuilating  sheathing  (C)  A B Celotx cane board insuilating  sheathing  (C)  A B Celotx cane board insuilating  sheathing  (C)  A B

Above: photo of Celotex cane-board insulating sheathing along with packabge labeling, provided by an reader . [Click to enlarge any image]

Below: Celotex Lay-In Fiberboard Ceiling Tiles date-stamped 3/82

Celotex fiberoard lay-in ceiling panels (C) Mark Celotex fiberoard lay-in ceiling panels (C) Mark

Question: do these 1982 Celotex Ceiling Panels Contain Asbestos?

I just purchased a large volume of Celotex Fiberboard Lay-In Panels [photos above] from a private party that had posted on a Facebook page. The seller had told me that the material was in his basement and had been purchased but not installed by the previous owner.

It didn't even cross my mind that the material could contain asbestos until after it was delivered and my wife brought it up. I have included two photos of the label.

In the bottom right corner of one, I think there is a date listed as 3/82. My guess is that this is the date it was produced. This issue is causing me a great deal of anxiety as I may have done something stupid here. Any help you can offer would be so greatly appreciated. Thank you - anonymous by private email 2018/09/05 -


Try to fight off the anxiety as that's more of a health risk than the hazard of possible-asbestos-containing ceiling panels still in boxes. Generally, "fiberboard" is a cellulose based product, not an asbestos one.

I suggest having a sample tested - cost about $40. - as that will tell us for sure if these panels, made rather close to when companies stopped using asbestos in such products - can be used or should be tossed out or returned to the vendor.

See ASBESTOS TESTING LAB LIST. Do let us know what you find as that will assist other readers.

Celotex gypsum board interior wall system in 1943 (C) InspectApedia original source Architectural Record 1943 p. 16

Celotex asbestos board (C) InspectApedia op cit 1943

Cemesto building panels from Celotex (C) InspectApedia op cit 1943

Celotex gypsum roof panels (C) InspectAPedia 1943 op cit

What is Celotex Insulating Lumber? Did it contain asbestos?

Celotex insulating lumber Reader question: I have a home built in 1940 that used a brown fiber board called "Celotex Insulating Lumber" looks like is was designed to be used as sheathing and lath. Made in either Chicago on Louisiana. Anyone familiar with this? Or know if it contained asbestos? - Dan Theisen 1/30/12


Dan, Celotex, a Chicago company, has been a producer of a wide variety of insulating sheathing boards for a long time and the company continues to produce modern insulating board products as well.

Our illustration (left) shows Celotex insulating lumber on the exterior of a Lebanon PA home. This insulating board is a wood-fiber product (actually made of bagasse fibers obtained from sugar cane, that is, cellulose) that we document in detail at SHEATHING, FIBERBOARD.

Asbestos was not among the product's ingredients. Only if such products were produced at a manufacturing facility that also produced asbestos-containing products might there have been a risk of cross-contamination that could result in the detection of asbestos in the cellulose-based materials.

Asbestos in Celotex Gypsum Board (drywall) 4X8 panels?

Celotex tapered edge drywall gypsum board (C) InspectAPedia

This topic has moved to CELOTEX DRYWALL ASBESTOS where we illustrate Celotex gypsum board products, labels, and where we discuss possible asbestos content in Celotex brand gypsum board.


Also see ASBESTOS TESTING LAB LIST if you need to demolish asbestos-suspect drywall or joint-compound or other asbestos-suspect materials.

Question: was asbestos used in Celotex Thermax foam core insulating board sheathing?

Celotex Thermax TM Insulating board  (C) JW

Jason Wojnowiak said:

I have a picture of some Celotex. IMG_5620.JPG
Would you know if this has asbestos?

Reply: some Celotex Thermax™ laminate insulating board products contained asbestos at least in patent disclosures


Celotex Thermax™ was (and is currently as a Dow Thermax™ product) a foil-faced insulating board comprised chiefly of foam insulation, laminated with aluminum foil or possibly kraft paper.

Asbestos appeared in some, probably not all, foam insulating boards made up to the early to mid 1980's, particularly or more likely in fire-resistant products that incorporated a layer of asbestos paper.

Looking at photos you sent by email, I think your Thermax sheathing is a later polyisocyaurate foam insulating board reinforced with fiberglass and faced with aluminum foil, though of course an expert inspection of your material might find something different. Please see details about Celotex Thermax and its successor Dow insulating sheathing board, now found

History of the Celotex Corporation: Background on Celotex & Asbestos

Please see the new and more complete Celotex history information given at CELOTEX HISTORY & PRODUCTS

While an expert lab test using polarized light microscopy may be needed to identify the specific type of asbestos fiber, or to identify the presence of asbestos in air or dust samples, many asbestos-containing building products not only are obvious and easy to recognize, but since there were not other look-alike products that were not asbestos, a visual identification of this material can be virtually a certainty in many cases.

See ASBESTOS FIREPROOFING SPRAY-On Coatings for photos of dangerous tremolite asbestos ceiling panels and photos of spray-on asbestos fireproofing coatings.


and see ASBESTOS DUCTS, HVAC a field identification guide to visual detection of asbestos in and on heating and cooling system ducts and flue vents.

Also see Micro-Photographs of Dust from the World Trade Center collapse following the 9/1

References & Research on Asbestos in Celotex Products


Continue reading at ASBESTOS CEILING TILES or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see CELOTEX ASBESTOS PRODUCTS FAQs - Q&A posted originally at this page

Or see






Also see MESOTHELIOMA doctors, organizations, treatment resources, legal advice.


POLYISOCYANURATE FOAM BOARD - more about Celotex and Dow insulating sheathing

Suggested citation for this web page

CELOTEX ASBESTOS PRODUCTS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia


Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

Ask a Question or Search InspectApedia

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.

Search the InspectApedia website

HTML Comment Box is loading comments...

Technical Reviewers & References

Click to Show or Hide Citations & References

Publisher - Daniel Friedman