What do you know about APP and SBS torchon membranes

Published 8th July 2016 John Stallard

WPS TPO or Thermoplastic polyolefin was developed and introduced initially to address the short comings of PVC. TPO’s strength is its ability to withstand UV radiation and reflects more heat than it absorbs. The white TPO is extremely reflective and the most efficient at preventing heat from being transferred into the building. TPO has a higher breaking strength in an installed situation than any other single ply systems making it more desirable in applications where penetrations are required . It’s not as flexible as rubber or PVC KEE systems during installations, but has better overall performance as an installed membrane system. WPS TPO has been in New Zealand since 2004 is now widely used in all types of roofing situations as a durable, contamination resistant, and efficient roofing membrane system.

APP (Atactic Polypropylene) are more suited to warm and very hot climates. They are very resistant to weathering, aging and are far more resistant to ultraviolet radiation than the SBS torchon membranes. bituFLAME is a APP torchon membrane and is the new generation APP which has the elongation properties of an SBS membrane but with the superior UV resistance that APP membranes naturally have. For NZ we recommend using the APP mineral chip finish.

bituFLAME is a proven APP modified bitumen membrane system, very UV resistant with an excellent in-service history.

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