Breathable vs non breathable felt

[tonyo]

Hi
can anyone explain the benefits of breathable over non breathable felt to be used on an 80sq m pitched roof in a garage.

Also I have read recently that breathable felts can result in the death of bats that roosts between the felt and the slates. Does anyone know of a modern felt that is safe for bats or a way of keeping out bats.

 

[tony1851]

Breathable is far more expensive, and probably not worth it for a garage.

 

[tonyo]

Apart from the cost what would be the difference between breathable and non breathable.

And does anyone know of a modern felt that won't kill bats

 

[tony1851]

If you're bothered about the bats, why not use the cheaper ordinary bitumen-based felt?

 

[tonyo]

Thanks for the reply

I wanted to use a lighter membrane due to the garage being 12m long, it makes it at lot easier using 1.5m rolls

 

[catlad]

The only person who would think that would be someone who was guessing.

 

[noseall]

Also I have read recently that breathable felts can result in the death of bats that roosts between the felt and the slates. Does anyone know of a modern felt that is safe for bats or a way of keeping out bats.

How is a breathable membrane any more dangerous to bats than say a bituminous one?

Did you also read the reasons why?

 

[palaceray]

Apparently the fibres in membranes like Tyvek trap the bats and they die.

 

[tony1851]

I wanted to use a lighter membrane due to the garage being 12m long, it makes it at lot easier using 1.5m rolls

Then it's a choice between saving the strain on your back, or saving a few bats.