Asbestos Bitumen Waterproofing
Bituminous waterproofing membranes and coatings reinforced with asbestos fibres for durability and flexibility.
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Description
Asbestos bitumen waterproofing encompasses a range of products where asbestos fibres are combined with bitumen to create flexible, waterproof membranes, coatings, and adhesives. These products were manufactured from the 1930s through to the mid-1990s and used for flat roof coverings, damp-proof courses (DPCs), foundation tanking, gutter linings, and industrial floor coatings.
The asbestos content in bituminous waterproofing products typically ranges from 5 to 15 per cent, with chrysotile being the most common fibre type. The asbestos reinforcement gave the bitumen matrix greater tensile strength, flexibility, and resistance to cracking under thermal movement. It also improved the material's longevity and ability to bridge small cracks in the substrate.
Asbestos bitumen products are found in several distinct forms. Sheet membranes, produced by saturating an asbestos fibre mat with bitumen, were laid on flat roofs and beneath concrete floors as damp-proof membranes. Liquid bitumen coatings containing asbestos were painted onto foundations, retaining walls, and metal gutters. Bituminous adhesives with asbestos were used to bond roofing felts, floor tiles, and insulation boards.
In their intact state, asbestos bitumen products are generally non-friable because the fibres are encapsulated within the sticky bitumen matrix. The risk increases when the material is removed, cut, heated, or allowed to dry out and become brittle. Heating bitumen-asbestos products — for example, when using a torch to strip old roofing felt — is particularly dangerous because it can release both asbestos fibres and toxic bitumen fumes.
If asbestos bitumen waterproofing is discovered during renovation or demolition, it should not be heated, torn, or dry-scraped. A licensed asbestos contractor should assess the material and carry out removal using appropriate methods, which may include controlled wetting, careful peeling, and sealed containment of waste. All asbestos-contaminated bitumen waste must be disposed of at a licensed hazardous waste site.
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Comment l'identifier
Asbestos bitumen waterproofing is typically black or dark brown and has a tar-like appearance. Sheet forms may show a fabric-like reinforcement layer when torn or cut. Old bituminous coatings may appear cracked, dry, or chalky on the surface. The presence of a fibrous mat layer within a bitumen membrane is a strong indicator of asbestos content. Any bituminous waterproofing product in a building predating 1995 should be sampled and tested before disturbance.
Risque sanitaire et friabilité
Ce matériau a un niveau de risque de 2 sur 5.
Il est classé comme non-friable, ce qui signifie que les fibres d'amiante sont fermement liées dans la matrice du matériau. En bon état et non perturbé, le risque de libération de fibres est faible. Cependant, couper, percer, poncer ou casser le matériau peut libérer des fibres dangereuses.
Que faire si vous trouvez ce matériau
Do not heat, torch, or dry-scrape bituminous waterproofing materials without first testing for asbestos. If the material is intact and not being disturbed, it can usually be left in place safely. If removal is required for renovation or replacement, engage a licensed asbestos contractor. Wet methods and careful peeling are preferred over heating or mechanical removal. All waste must be double-bagged and disposed of as asbestos waste.
Questions fréquentes
Does all old roofing felt contain asbestos?
Can I torch-on new felt over old asbestos roofing felt?
Is the black coating on my foundation asbestos?
Matériaux associés
Autres matériaux contenant de l'amiante que vous pourriez rencontrer.
Asbestos Roofing Felt
Bituminous roofing felt reinforced with an asbestos fibre mat, used on flat and low-pitch roofs.
Asbestos Flashband
Self-adhesive bituminous flashing strips reinforced with asbestos, used for weatherproofing roof junctions.
Asbestos Sealant
Fire-stop and expansion joint sealants formulated with asbestos fibres for heat resistance and durability.
Asbestos Cement Corrugated Sheet
Corrugated roofing and cladding sheets made with chrysotile asbestos fibres bound in Portland cement.
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