There are 18 species of bats found in the UK all with different characteristics and habitation requirements, and there are many ecologists willing to offer varying opinions on what is or is not bat friendly. We would always recommend seeking advice from the Bat Conservation Trust, however the Trust now no longer endorses specific products for use without lengthy ecological studies.

The modern generation of lightweight high performance spun-bonded roofing underlays do however pose a risk to some bat species where it is possible that their claws will become entangled in the fibres and therefore should not be used in bat habitation spaces.