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

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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.

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

Asbestos containing acoustic ceiling tiles

[Click to enlarge any image]

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

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

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

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

Celotex product description from 1943, Architectural Record October 1943 p. 16 -

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, Asbestos-Containing or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see




POLYISOCYANURATE FOAM BOARD - more about Celotex and Dow insulating sheathing

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


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