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For latest update see: https://somersetbat.group/advice/planning/brm/
14th Feb 2019.
Following a up on a enquiry from a local Builders Merchants chain, we have today received clarification from the Bat Conservation Trust (BCT) of their Statement in the January Bat Worker Bulletin:
Modern Roofing Membranes (formerly Breathable Roofing Membranes) currently are of a spun poly-bounded construction made up of long fibres, bats claws are sharp enough to pull these fibres loose, which entangle and ultimately kill bats.
BCT are aware the there is a new roofing membrane on the market called TLX Batsafe which claims it is safe for use in bat roosts, however BCT has not seen test data to verify this. Therefore the original advice stills stands, currently the only ‘bat safe’ roofing membrane is bitumen 1F felt that is a non-woven short fiibred construction.
It has also been noticed that on the manufactures website http://www.tlxinsulation.co.uk it says:
A summary of the manufactures testing is on the technical page of their website.