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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.

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    • CommentAuthordelprado
    • CommentTimeMar 7th 2018
    From some general reading online, there is an implication, including some intimations made by a conversation on Bere Arhcitects blog, that IWI may, unlike EWI, contribute to summer over heating. Does anyone have a view on this?
    A lot depends on fenestration, orientation and shading.

    A colleague who did a near-PH IWI 'deep retrofit', and whose (S-facing) rear ground floor wall was almost entirely glass, found he had some overheating.

    Had he designed in, or retrofitted, a brise soleil, or similar, I do not think he would have had a significant issue. He had some 'exposed' thermal mass in the form of an 80mm screed under floorboards, but that was it.
    • CommentAuthortony
    • CommentTimeMar 7th 2018
    Summer overheating will be worse with IWI than EWI as the mass cant absorb the heat to moderate temperatures.
    That's not my experience - on a day/night cycle the heat only penetrates a few mm into the wall so ewi/IWI/CWI perform the same. We added IWI to a south facing timber frame former and it really helped reduce heat gain.
    • CommentAuthordelprado
    • CommentTimeMar 7th 2018
    In my case I've also got two layers of brick in front of it so maybe I am worrying over nothing?
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