Asbestos containing acoustic ceiling tilesCelotex® insulating products believed to contain asbestos or to be 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.

Green links show where you are. © Copyright 2015, All Rights Reserved.

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

Asbestos containing acoustic ceiling tiles

  • Acoustical Systems & Sound Control Systems [1]
    • Acoustical ceiling panels. Notes: Asbestos fibers were used in some acoustic asbestos ceiling tiles, often amphibole asbestos such as amosite, crocidolite, anthrophylite, tremolite, and actinolite, with amosite among the most commonly-found. Modern ceiling products do not contain asbestos.
    • Insulating panels.
    • Celotex Brand ceiling tiles - [Suspended ceiling tiles of the 2'x2' or 2'x4' dimension, and manufactured by Armstrong, Celotex, Conwed, LoTone, and USG and made before the late 1970's are listed by several attorney-sponsored "mesothelioma websites" as often containing asbestos to add fire-resistance. On that basis, if the age of your ceiling is in that range it would be prudent to treat it as PACM.[9] Confirmation of asbestos content use & dates pending - Ed.]
  • Cane fiber products [2] [Cane products were not an asbestos-containing product, though some may have been manufactured at facilities where asbestos was present - Ed.]
    • Celotex sheathing,
    • Celotex insulating lath (board),
    • Celotex interior finish,
    • Celo-Siding
  • Celo-Rok Gypsum products [some gypsum-based drywall as well as drywall compound may contain asbestos]: [2]
    • Celo-Rok anchor lath,
    • Celo-Rock wallboards,
    • Celo-Rok plasters
  • Insulating building panels or "fiberboards - [Fiberboard is generally a wood-fiber productd
    See FIBERBOARD SHEATHING, Celotex Homasote & Other , but someproducts listed here include fiber-cement materials, probably due to confusion among attorneys who have erroneously lumped these materials together - Ed. ] Also
  • Other Building insulation products
    • Carey 7-M Asbestos Shorts
    • Carey Block Insulation & Careytemp masonry block insulation and blocks
    • Carey Insulating Cement, CareyTemp insulating cement, & Carey MW-50 Insulating Cement
  • Building plumbing products
  • Building roofing products
  • Building interior products

Background on Celotex & Asbestos

  • 1970: The Celotex Corporation of America introduced an isocyanurate foam ceiling tile [11] (not an asbestos-containing product). By this year, asbestos was widely used as fireproofing in roofs, floors, ceilings.[28]
  • 1999: US EPA Asbestos Materials Bans: Clarification. This document makes clear that EPA has no existing bans on asbestos-containing products other than items listed in this document: ACM ceiling tiles were not banned. Note: however because of public resistance to purchase or use of ACM products, many manufacturers discontinued of asbestos in various products, particularly after 1976. Check the individual product MSDS for confirmation of its content. - Ed. In this year Great Britain banned the sale or re-use of white asbestos. [26]
  • See ASBESTOS MATERIAL REGULATIONS for a history of asbestos bans, regulations, laws

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

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 we document in detail at SHEATHING, FIBERBOARD.

Asbestos was not among the product's ingredients.

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

Celotex tapered edge drywall gypsum board (C) InspectAPedia5/21/2014 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.muse the CONTACT link 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



Continue reading at ASBESTOS CEILING TILES, Asbestos-Containing or select a topic from the More Reading links shown below.

Or see




Suggested citation for this web page

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

More Reading

Green link shows where you are in this article series.


OR use the Search Box found below at Ask a Question or Search InspectApedia


Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

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.

Search the InspectApedia website

HTML Comment Box is loading comments...

Technical Reviewers & References

Publisher's Google+ Page by Daniel Friedman

Click to Show or Hide Citations & References