If the tile has less than 1 percent asbestos then the results are negative.
How to spot asbestos roof slates.
Cut the tile carefully and place it in a plastic container.
The date of the building or material can also tell you a lot about asbestos risk.
Asbestos shingles were so common during the 20th century that almost any shingles installed between 1920 and 1986 probably include asbestos.
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The asbestos fibers inside slates can only be released when they are broken and this roofing material does not necessarily require removal although many people choose to do it.
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.
Find an inconspicuous area in the roofing and mark a square inch of tile.
If you don t know the age of the shingles inspect them for wear.
Their width can range from 12 to 48 inches and are very simple to identify since asbestos fibers can be seen on the grained sections of the material.
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If they look old they might have asbestos fibers in them.
With slates the mark was ink jetted on to the back of approximately one in twenty products with the same letters denoting whether they contain asbestos or not.
The cost of testing a small sample is reasonable.
Buildings made between the 1940s and the 1980s are very likely to have used asbestos materials.
Determine when the shingles were installed on your roof.
Take the sample to an asbestos testing laboratory.
