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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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    • CommentAuthornstansbury
    • CommentTimeNov 10th 2017 edited
    I have a load of this graphite EPS EWI insulation https://ewistore.co.uk/shop/ewi-410-eps-platinum-grey-insulation-70mm that I'm intending to cut and use as a retro-fit cavity closer under new windows going in.

    I appreciate it is EWI insulation, but as it will physically bridge the brick-block cavity at the reveal should I run a strip of DPC along the inner face of the outer brick leaf before sandwiching the strip of EPS behind it, or even wrap each strip in a DPM to cover it? I'm worried about moisture tracking back across it.

    The windows will sit on the brick outer leaf with a strap back across to the inner block


    • CommentAuthorMarkyP
    • CommentTimeNov 10th 2017 edited
    Is your cavity fully or partially filled? The closer is a fire detail if you have partial fill cavity then technically you should use a fire resistant mineral wool closer.

    I have a fully filled cavity so no concerns from a fire detailing point of view. I used various offcuts, EPS , PIR and XPS. "proper" cvavity closers arent cheap, especially ni wider cavity formats. With my DIY closers I didn't use a DPC, BCO agreed the DPC here was an out dated detail, I cant see water tracking across EPS. I foamed the EPS closer into place.
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