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 Post subject: Permeable membrane
PostPosted: Mon Oct 09, 2017 9:06 am 
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I understand roof membrane to have classification depending on the 'slope' of the roof - is this correct?

I want to cover a low slope shed roof (<20 degrees) before covering with corrugated sheet (steel).

The roof void (internally) will have a ceiling with glass wool insulation above (only a couple of inches but better than nothing).

Could I use an impermeable membrane providing I vent the enclosed roof space? or would it be better to get the appropriate breathable membrane - in which case can anyone recommend something?

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 Post subject: Re: Permeable membrane
PostPosted: Wed Oct 11, 2017 12:49 pm 
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breathable membrane is pretty cheap now, proctor and dupont (tyvek) to name a couple, there are lots some are crap.

I just did my garage with the cheapest waterproof and breathable membrane from screwfix (it seems ok), over sarking with corrugated sheet on top.

My house on the other hand has the best quality membrane proctor does.

Have you got sarking or just battens?

All membranes have downloadable data & spec sheets to give you fitting angles & overlaps.


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 Post subject: Re: Permeable membrane
PostPosted: Wed Oct 11, 2017 1:45 pm 
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Thanks.

It's an OSB roof. Just taken delivery of a roll of suitable stuff (I think) and it gives all the spec for lapping and wind lift etc and it states it's good for roofs with pitches starting at 12.5 degrees so I reckon it's sorted!

:thumbright:

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 Post subject: Re: Permeable membrane
PostPosted: Wed Oct 11, 2017 3:49 pm 
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are you using screw hex head fixings for the corrugated, i drilled the holes for mine on the roof and it was a pig, I then saw a tip to stack all the corrugated sheet and drill through them on the ground, this makes life much easier for fitting on the roof however you need to be sure the holes are in the right places!


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