A brief history of asbestos cement siding.
Asbestos siding what do asbestos shingles look like.
Asbestos siding was manufactured to resemble many different materials so it doesn t always look the same.
Covering old asbestos shingles with new siding may seem like an option too but it s not easy to do safely.
And see asbestos cement siding for details about cement asbestos building siding its repair removal demolition or cover over.
Because fiber cement siding manufactured in north america after around 1978 was made without using asbestos in those later products and because those non asbestos fiber cement shingles included products that by eye were an exact visual match for their older asbestos containing brothers and sisters already installed a building built.
If they look old they might have asbestos fibers in them.
Recognizing siding with asbestos.
Most likely the shingles are in two sizes 12 inch or 24 inch.
Determine when the shingles were installed on your roof.
Testing for positive id.
The best method for determining if a substance contains.
Look for siding that looks like roof shingles.
It is usually brittle and the back may be black and have the appearance of tar paper.
The bottom of an asbestos siding tile may have a wave like pattern though not always.
Asbestos cement was first developed in 1905 by the johns manville company who became one of the premier manufacturers of cement asbestos materials.
You can t drive screws and nails through them without pre drilling.
Asbestos shingles were so common during the 20th century that almost any shingles installed between 1920 and 1986 probably include asbestos.
Asbestos cement is a mixture of portland cement reinforced with asbestos fibers.
Asbestos is a natural fibrous mineral used for insulation and fireproofing.
Cement asbestos wall shingles outside and not easily friable unless being demolished or cut with power tools.
This would trigger dust and asbestos dust is a problem as i ve mentioned.
If you don t know the age of the shingles inspect them for wear.
When the fibers become airborne they pose health concerns.
The portland cement binds asbestos fibers into a hard mass.
Asbestos siding was manufactured to resemble many materials so it won t always look the same.
This is the most common pattern used.
The use of asbestos siding shingles was a popular one that was used in the us from the early part of the 20th century until the 1970s.
If the asbestos material is in good shape and will not be disturbed do nothing.
The front may have a grainy sandy texture.
Asbestos cement roofing shingles and siding products are not likely to release asbestos fibers unless sawed dilled or cut.
See photos at asbestos siding in this document.
Old asbestos siding tiles may also have a wood grain texture like cedar.
