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 Post subject: Roof felt/underlay
PostPosted: Wed Sep 20, 2017 12:41 am 
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Hi Folks,

Was just wondering how do I know if the roof felt, which I can see from inside my loft, is breathable or not?


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 Post subject: Re: Roof felt/underlay
PostPosted: Wed Sep 20, 2017 9:47 am 
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Hmm good question.

At first I would say that if it is bituminous, then it is not breathable, and anything else is.

Just having a look at the history of roof felt now

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 Post subject: Re: Roof felt/underlay
PostPosted: Wed Sep 20, 2017 11:14 am 
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How long has it been there - and is there any printing on it, either a logo or brand name/number?

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 Post subject: Re: Roof felt/underlay
PostPosted: Wed Sep 20, 2017 12:43 pm 
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for a time there was a dodgy plastic sheating stuff used. tht caused problems.

breather paper tends to have lots of little teeny tiny holes and not look at all like old skool roofing felt


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 Post subject: Re: Roof felt/underlay
PostPosted: Wed Sep 20, 2017 8:49 pm 
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Could it be sarking?

How 'smooth' is the surface?

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 Post subject: Re: Roof felt/underlay
PostPosted: Thu Oct 12, 2017 12:22 pm 
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Hi Folks,

This is the underfelt here. I'm not sure if it is breathable or not. It looks like it could be though, pretty smooth surface


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 Post subject: Re: Roof felt/underlay
PostPosted: Thu Oct 12, 2017 1:27 pm 
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looks as if it is to me


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 Post subject: Re: Roof felt/underlay
PostPosted: Thu Oct 12, 2017 5:31 pm 
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You can get the modern felts like that which are not breathable as well. They have a wax coating on top. The only way you’ll know is by removing some tiles and having a look at the branding as every one has the logo plastered over the front of the felt whether it’s proctor/roofshield/tyvek etc. You’ll also see whether it’s got a wax coating on the outside.


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