Western red cedar cladding - will it condensate

8 May 2009
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United Kingdom
The front of my house is tile slung.

I'm looking to remove the tiles and battens.

Lay tyvek breathable membrane onto the block work.
Then batten with 45x75 treated timber
Insulate between battens with 75mm celotex then clad with western red cedar.

My question is will it condensate and do I need to allow for air flow.
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It will run down the back of the cladding or the membrane

As you have a masonry wall, the cladding is just decorative
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IMO you should definitely allow for airflow, 25mm is often stated but in this instance you can prob get away with 10mm. You probably don't need membrane.
Beware when ordering the timber, that the finished size might be slightly smaller, so you'd have the insulation sitting proud of the timber.
The space between the laths will give the airflow. And there will be the drainage provision at the base
There wouldnt be any lathes.

I was going to use a 75mm treated stud timber fixed straight back onto the blockwork.

75mm insulation between then the cedar on top leaving no air gap.

Im not thinking i may still use the 75mm timber studs with 60mm insulation then the cedar leaving a 15mm gap between the insulation and the cedar.

what do you recon?
As long as air can circulate immediately behind the cladding, you will be OK.
Some (driven) rain is bound to get in sometimes, and it needs to be able to drain and dry out.

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