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PostPosted: Tue Jun 05, 2018 9:17 am 
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In the process of constructing the small shed I applied a vapour barrier (about three months back) around the stud frame work and over the OSB plywood roof and eaves (Cromar Vent 3 Light) as pictured below...

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The other day I had to remove some of the vapour barrier on the roof, to my horror the plywood underneath looks like this...

Image

I've never dealt with mould before but I'm assuming this is what is? I can't quite understand why the surface of the plywood is now covered in this? Surely the vapour barrier lets out moisture not retains it? Also the vapour barrier is water proof?

The underside of the plywood...

Image

...feels slightly damp and an odd black line but no black spots.

A metal roof is will finally cover the plywood (suspended on battens). What worries me is this mould, if it is mould and that the plywood could rot away?

Any ideas about this?

Thanks :)


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PostPosted: Tue Jun 05, 2018 11:00 am 
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how much off an air gap do you have between outer cladding and membrane :dunno:

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PostPosted: Tue Jun 05, 2018 1:43 pm 
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big-all wrote:
how much off an air gap do you have between outer cladding and membrane :dunno:


Yes, I've made a mistake here! No gap! I should've used 2 x 1 battens only I found out after I attached the feather edge boarding.

However this shouldn't trouble the roofing plywood?


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