These roof mats were widely used in built up roofs in the us epa 1990c.
Asbestos bitumen roofing felt.
The primary applications for asbestos felt included.
As a rule intact felt is considered pretty safe as the asbestos is firmly embedded in bitumen so the dust issue does not arise unless the edges are badly weathered even then the quantity to be released is pretty small more dangerous if burnt though.
Asbestos can also be found in spray coatings lagging and insulation boards cement panels floor tiles and bitumen felt mastics sealants putties and adhesives textured coatings and paints yarns etc.
Roofing tar and asphalt liquids.
Also referred to as asbestos roof mat it is a component that is impregnated in asphalt that was used as an insulating and waterproofing material between roof boards and shingles johns manville no date.
Various guides go into detail about other asbestos locations.
Construction workers used asbestos felt as an underlayment for shingles and it was also sometimes the main material used in built up roofs.
Asbestos fibers found their way into these roofing products.
Information about health and safety at work.
The felt was made up of sheets of asbestos material that was then covered with asphalt.
Shingles weren t the only roof product containing asbestos materials.
Old exterior roofing felt on flat roofs or sheds is also a possibility.
Roofing felt and underlayment.
Work on roofing felt would not normally be notifiable provided that the material is in good condition.
In fact most other roofing products produced in the early to mid twentieth century contained asbestos.
Bituminous waterproofing systems are designed to protect residential and commercial buildings bitumen asphalt or coal tar pitch is a mixed substance made up of organic liquids that are highly sticky viscous and waterproof.
But the workers who installed the felt were very likely exposed to the dangerous asbestos fibers.
However tasks on these particular materials can be carried out by non licensed workers who are appropriately trained.
How dangerous is this.
These systems are sometimes used to construct roofs in the form of roofing felt or roll roofing products.
I had a look at the old felt we had removed and it s a black tar type felt with what looks like stands of hessian in a criss cross pattern and some sort of paper on the back.
Asbestos felt was often laid under linoleum vinyl and asphalt floor tiles for padding and insulation.
Asbestos roofing felt being cut.
Hi did any old bitumen roofing felts used in residential pitched roofs contain asbestos.
