Older roofing systems may include asbestos in felts, mastics, coatings, shingles, flashing compounds, underlayment, and other components. Evaluation should occur before tear-off, cutting, grinding, or demolition.
Which roofing components may be suspect?
Potential materials include built-up roofing felts, roof mastics, sealants, coatings, shingles, flashing compounds, cement panels, and layers beneath newer roof systems.
Why are roof assemblies difficult to assess?
Multiple roofs or repair layers may exist. Materials can vary by section, addition, installation date, and prior repair history.
When should roofing be tested?
- Before tear-off or replacement
- Before core cuts or penetrations
- Before demolition
- After storm damage
- During capital planning for older facilities
How do results help the roofing contractor?
Results allow the contractor and owner to plan access, sequencing, removal methods, disposal, and schedule impacts before mobilization.
Frequently asked questions
Can a roof be tested without removing the entire system?
Representative sampling can often evaluate specific layers, but the sampling plan depends on roof construction and access.
Does a newer top layer mean older layers are safe?
No. Older roofing components may remain beneath later installations.
Should roofing work stop when an unknown layer is uncovered?
Yes. Avoid disturbing the layer until it has been evaluated.