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Asbestos cement roofing: shingles, corrugated, other forms: this document provides a photo guide and text that can help in identification of asbestos-containing roofing products like asphalt shingles & asbestos-cement roof shingles. We include photographs of various asbestos-containing cementious roofing products such as asbestos cement shingles and corrugated asbestos cement roofing.
Our page top photograph shows badly deteriorated fiber cement roof cladding installed on a motor lodge in Oamaru, New Zealand.
This roof was installed in 1986 and was the subject of a class action settlement.Interestingly, though identified by the building manager as a fiber cement product, this roof, from the ground, in its deteriorated condition this roof looks more like a wood-fiber shingle product than a cement-fiber shingle product. Additional photographs of this roof and its cladding material are included in the article below.
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Cement-Asbestos Roof Shingles,Tiles, or Corrugated Roofing: Photo guide to asbestos containing roofing products
This article assists building buyers, owners or inspectors who need to identify asbestos materials (or probable-asbestos) in buildings by simple visual inspection.
The mixture of asbestos fibers and portland cement to form a hard material that was was durable and fire resistant is credited to Ludwig Hatschek who, in 1900, came up with the name Eternit associated with a U.S. producer of these products. Some fiber cement roofing contains asbestos while other products do not.
Original Asbestos-Cement Roofing & Siding Colours & Patterns
Amy Lamb Woods, in "Keeping a Lid On It" Asbestos-Cement Building Materials" provides a superb and concise description of the history and properties of asbestos cement building products, while beginning at ASBESTOS ORIGIN & NATURE we provide the compete text of Rosato's 1959 seminal work on this topic.
Current Fibre Cement Roofing
No modern contemporary fiber cement roofing or siding product is manufactured containing asbestos.
Fiber cement roofing products, a replacement that is similar in properties but that does not use asbestos, continue in popular and widespread use in the North America and many other areas of the world today. In some parts of the world, fibre cement cladding products are manufactured in compliance with Asbestos-free Standard ISO 9001:2008.
In the article series found at More Reading at the end of this article 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.
However as we discuss at FIBER-WOOD & FIBERBOARD ROOFING, even modern wood-cement and other fibre cement products are not impervious to deterioration or fungal growth. Branko (2006) points out that in modern cement-bonded aggregate and fibre products, especially in prolonged-wet environments, particularly in wood-cement and straw-cement products (such as StrawCrete) the materials support fungal growths, even visible "mushrooms" such as the genus Peziza. - Branko (2006)
How to Recognize Asbestos Cement & Fiber Cement Roofing 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.
Most roofing materials are considered to be non-friable, and are probably less hazardous than other friable asbestos products such as asbestos pipe insulation.
However removal of asbestos-containing roofing products is regulated as we discuss below.
Cementious-based Fibre-Cement Roof Cladding Wear & Failure Examples
Above are additional photographs of the fibre cement roof shown at the top of this page. The photo at above left shows an interesting wear pattern that suggests that chemical or mineral down-wash from metal components installed at the ridge might have been a factor in this particular wear. At above right is a fibre cement roof shingle that was salvaged and doubtless is held for use in repairs. From a distance this product looks a lot like slate, doesn't it?
However these roof tiles were badly worn over many areas of the roof as we show at page top and below.
Unlike the Masonite Woodruf™ roofing discussed below, these delaminating cementious roofing tiles (or cladding, slates or shingles) are a cementious material reinforced with fibres. Early product versions used asbestos.
More contemporary fibre cement products use filler and reinforcement that does not include asbestos, commonly fibreglass. What about the shingles shown just above? They were installed in 1986 and were photographed (above) in 2014, making them 18 years old. We were told by a tenant that the building owner received a settlement on this roof but has not replaced it. Lab samples of this roof cladding are being tested. and results will be reported here.
Watch out: from the ground it can be difficult to distinguish between wood-fiber based shingle products like the Masonite product described below, and fiber-reinforced cement shingles resembling the roofing shown above.
Taking an up-close look, even without magnification or forensic microscopy, the distinction between cementious fiber cladding and wood-fiber based cladding will be visually obvious - as you may notice in the Masonite Woodruf™ type shingles shown next.
Asbestos cement roof shingles were in popular use in the U.S. from the 1920's (est) through the 1960's (est) and were sold in the U.S. into the 1970's and according to some sources even in the 1980's.
The mixture of asbestos fibers and portland cement to form a hard material that was was durable and fire resistant is credited to Ludwig Hatschek who, in 1900, came up with the name Eternit associated with a U.S. producer of these products.
The typical life expectancy of an cement asbestos shingle roof was given as 30 years, but we've seen these roofs that were now 50 years old in good condition. Typical roof wear or failure patterns are either failure of the shingle fasteners or broken and falling shingles.
Asbestos cement corrugated roofing has been in use over the same time period and was generally a thicker material used in low-cost applications such as on sheds, barns, and low-income housing in some areas.
Roofing materials that use fibers and aggregate other than asbestos are properly called "fiber cement" roofing products. Some manufacturers use the term "fiber-reinforced cement" for these products. All of these products use some sort of fiber along with cement. Before 1978 in the U.S. the common fiber used was asbestos.
Also see the following articles providing more detail about asbestos-cement roofing:
See Cement Asbestos Roof Shingles, information for home buyers & home inspectors for basic information for home buyers purchasing a home with cement-asbestos roof shingles..
How do we cut, install, or remove fiber cement roofing or siding products with a minimum of dust and potential asbestos fiber release? How friable are cement-asbestos roofing and siding products?
Definition of friable asbestos materials:
The asbestos in cement asbestos roofing products is not friable under normal conditions. That is, asbestos cement products are is not normally easily crushed into dust by hand.
Cleaning stains, mold algae, lichens from cement-asbestos roofs
Watch out: As we discuss at Power Washing Roofs we do not recommend power-washing asbestos-cement nor any other roofing.
See Black Stain Removal & Prevention for advice on diagnosing, cleaning, and preventing stains on roofing.
Warning about making asbestos-containing cementious materials become friable
Watch out: However very old, weathered and worn asbestos cement shingles, such as on a roof or sometimes on a wall that has been painted and is peeling, or roofing or wall cement asbestos shingles that are mishandled during demolition (breaking into many small pieces, running hand or power saws to cut the material) risks creating airborne asbestos-contaminated dust which could be a health and environmental hazard.
See ASBESTOS ROOFING / SIDING DUST - separate article
A modern version of this fiber cement cutter that is hand-lever operated and does not require electricity is the Bullet Tools 920 Pro Magnum Shear I-20 Electricity Free 20 Inch Flooring and Siding Dust Free Cutter (photo at left) - this is a great tool, but a bit steep for a homeowner or do-it-yourselfer at around $900. \
A modern fiber cement shingle cutting tool used for the same purpose is the Malco® TSFC Tubo Shear fiber cement cutting tool also used to cut cement backerboard and similar products.
The Malco fiber cement and backerboard shear is powered by a separate cordless or wall-power connected electric drill.
Malco also produces the TSF2A, a heavy-duty pneumatic shear cutting tool for the same purpose.
Similar shear tools are produced by quite a few other manufacturers - s
Added demolition and disposal cost of cement-asbestos products
Also in some communities special measures and added costs are involved because of a requirement for air-testing during removal and possibly costs to dispose of the material in an appropriate landfill. (After all, originally this material came from the land.)
Thanks to reader Van Moore for technical editing and requesting clarification.
Asbestos-filled asphalt paint was used damp proofing on building foundations and as a roofing sealant for many decades up to 1978.
Other paints and sealants that used asbestos fibers, particularly chrysotile asbestos include textured paints, textured surfaces using joint compound, and popcorn ceiling paints and coatings. Possibly also in some fire-resistant coatings and paints.
and ASBESTOS REGULATION Update that address the handling of asbestos containing building materials, including ACM (asbestos containing materials), PACM (presumed asbestos containing materials), SACM (suspect asbestos containing materials), and ACRM (asbestos containing roofing materials).
According to NRCA, the National Roofing Contractors' Association, their studies up to February 1992 had not found a single roofing job at which the asbestos permissible exposure limits (PELs) were exceeded, and NRCA reported that in some cases no fiber release was detected.
We note that the association would have been referring only to asphalt-based roofing materials, not jobs involving the demolition of other ACRM such as cement-asbestos roof shingles (or "asbestos roof tiles" as some consumers refer to them) which might produce different statistics.
At OSHA Asbestos Roof/Siding Regulations we discuss (briefly) the regulation of demolition & removal of cement asbestos or other asbestos containing roofing and siding materials.
Also see Environmental Issues - Asbestos Roofing/Siding. (Also see Hardie's Fibrolite™ or Fibro where used in Australia).
List of Fiber Cement Roof Shingle Companies Warranty Claims & Websites: Fibre Cement Cladding Products
Asbestos Cement & Fibre Cement Resources (also see REFERENCES below)
Continue reading at ASBESTOS ROOFING / SIDING DUST or select a topic from the More Reading links shown below.
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Frequently Asked Questions (FAQs)
Terry Jones said:
Yes - readers needing replacement fiber cement shingle wall siding should see Sources of Replacements for Asbestos Cement Shingles
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.
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