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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthorbxman
    • CommentTimeApr 15th 2019 edited
    • CommentAuthorgyrogear
    • CommentTimeApr 15th 2019 edited

    only a namerican could of thought of that !

    • CommentTimeApr 16th 2019 edited
    I hope he said outsulation not outsolation.

    Makes perfect sense. The concept doesn't have to be designed by some building scientist as it says at the beginning.

    Any of us who puts substantial EWI outboard of sheathed stud/rafters are doing this routinely - whether or not (about half max of) the EWI insulation is moved to between the studs/rafters is optional - the point is that at least about half of it is outboard.

    The interior aesthetic is OK but you might get tired of it - but is optional, as above.

    One thing jarred - outside of his sheathing he puts "the peel and stick weather barrier" before applying his EWI over that. If that's not just liquid-tight and airtight, but also vapour-tight, then this is a very different animal. The potential beauty of our UK method above is that is safely 'breatheable' i.e. requiring no vapour barrier. If fact is much better off without a vapour barrier, as my WUFI trials showed.

    Even if a VCL prevents water vapour coming from the interior, the outboard EWI insulation is plenty subject to flows of exterior atmospheric water vapour (if not accidental liquid water) and even in mild southern UK there will be interstitial condensation within at least the most outer parts of it, at some times and conditions. Then everything depends on it reliably re-drying, when the sun comes out, or at least come next summer. If it doesn't re-dry, then liquid steadily builds up, year by year.

    Current http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16097&page=1#Item_9 shows that this re-drying is doubly important in northern/Scottish (even e.g. southerly Dartmoor) UK. How more so again in many continental/US climates.

    An inboard VCL (such as this guy's peel and stick weather barrier) at a stroke halves the re-drying ability of the wall. Re-drying is as much to the interior as to the exterior - sometimes more or all one way, sometimes the othger, depending on fluctuating conditions.

    That's why properly configured 'breatheable' constructions work so well, and why, paradoxically, similar constructions but with VCL are more at risk of interstitial condensation problems.

    I don't think this construction, with that peel and stick weather barrier, is 'scientific' at all - is an embodiment of faulty conventional wisdom.

    PS How about changing the title of this thread to indicate its v interesting contents?
    • CommentTimeApr 16th 2019
    So apart from watching the eye candy video, did you read the article the video links to? The one that explains why the vapour barrier is there and how this construction works in all climates (allegedly).

    How does your proposed system cope in a hot climate with interior air-con?
    • CommentTimeApr 16th 2019
    You're talking to me Dave? Hot climate with interior air-con is beyond my ken, tho interesting for the mind-experiments it suggests. I didn't go there this time - but "all climates"? Def not for UK, even far north, according to my time with WUFI.

    I only had WUFI for a few months but have relied ever since on what I generalised from that, for example completely demolishing the 3:1 (5:1?) inboard-outboard vapour resistance (resistivity?) rule of thumb.

    Wd be interesting to have another go - anyone?
    • CommentAuthorbxman
    • CommentTimeApr 17th 2019
    PS How about changing the title of this thread to indicate its v interesting contents?

    I think that would require Keith's participation .

    Who has the best suggestion as to the most appropriate title ? there are clearly a number of benefits and probably a sizable reduction in costs
    • CommentTimeApr 18th 2019
    No, you can open your OP for editing and change the title yourself.
    • CommentAuthortony
    • CommentTimeApr 20th 2019
    Wouldn’t pass here on fire or sound transmission, not too sure how much insulation was used, looks to little to me
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