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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    I'm externally insulating a concrete block wall with 100mm EPS (50mm between 50x50mm timbers, then 50mm between timbers at right angles). Is it worth taping all the joints between the timber and the EPS? Was wondering if this would help with the performance of the insulation in any way, but was also concerned about trapping any moisture in the timber if I seal it with tape (it has been raining a lot recently...).

    Also, do I need to include any sort of membrane before I batten and fix my timber cladding? Is so, what would be best? I have a large roll of Visqueen but would I be better with something breathable?
    Hi Chris, I guess you know this is an unconventional construction. I am not sure about the effect of mostly covering the inner battens. Have you done a condensation risk analysis? I think buildesk do a free download, Nigel should be able to confirm if he reads this. In any event it is not a good idea to use a vapour barrier on the cold side of insulation. It should be a breather membrane if anything.
    • CommentTimeJul 16th 2007
    Chris already has the buildesk software but I would have thought it would be low risk.

    I would use a breather paper between the insulation and the cladding. Any air movement will reduce the effectiveness of the insulation.
    You could alternatively fill any voids with foam filler.
    It is the covering of the battens with EPS at 90 degrees which worries me. Then again I am always worried about something different :bigsmile:
    I put the second layer of EPS at 90 degrees to the first to reduce cold bridging through the timber. The timber is treated by the way. The gaps I've got are too small for foam. Perhaps I should just leave them and the breather paper will help reduce any air movement? Is there any particular breather paper product that I should ask for (I know nothing about them)?
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