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 Post subject: Ventilating a wall
PostPosted: Fri Nov 17, 2017 5:39 pm 
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Follow up to my previous post about insulating a timber framed wall. I've put rigid foam insulation between the wooden uprights, but left about 50mm gap between the foam and the back of the plywood. Now, how do I ventilate it?

The outside skin of the wall is:

cement render -> weldmesh -> building paper -> plywood. Absolutely no air gaps!

I believe adding some trickle vents to the outside skin would be advisable. I tried using the narrow brick vents, but they are not very easy to install in this wall. I'd really like some simple, small diameter circular vents that have insect screens. The only ones I've come across so far are for caravans (http://campingequipmentshop.co.uk/ces-wall-vent-round-vent-80mm-20861.html). Although these might do, they seem bigger than I think necessary and rather expensive. Do such things exist?


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 Post subject: Re: Ventilating a wall
PostPosted: Fri Nov 17, 2017 6:03 pm 
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What's the point in venting a non existent air gap, never seen that build up vented.
If you must then try soffit vents


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