Torch-on membrane waterproofing is a type of building waterproofing solution composed of bitumen and a variety of modified polymers. When applied to the surface of a structure, it prevents moisture and liquid from seeping through — which when ignored, can negatively impact the integrity of a building over time.
This type of waterproofing in building construction is a sheet membrane system that offers a highly effective waterproofing solution for roofing and other surfaces that experience ponding (when water collects on a flat surface), as it doesn’t get damaged nor allow seepage to occur. It is also resistant to chemicals, toxic vapours, and other dangerous elements.
There are two types of torch-on waterproof membranes:
Atactic Polypropylene Plastic modified asphalt (APP) – The asphalt in APP is processed with an elastic-plastic, designed to tolerate high temperatures, making it the perfect choice for those who are looking at an enhanced sun and UV radiation protection. In terms of application, APP melts easily when heated with a torch, compared to SBS sheets.
Styrene Butadiene Styrene or SBS – This type is made of rubber-modified asphalt making it more elastic than APP. It offers more flexibility in cold temperatures and handles fluctuating weather, temperature, and even contraction and expansion stresses well.
If you are unsure which is best (there are definitely advantages to choosing the right one) consult with an expert building waterproofing service provider to ensure that the waterproof membrane can withstand the test of time.
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