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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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    • CommentAuthorwookey
    • CommentTimeMar 19th 2019
    I'm replacing the windows on the north wall (along with EWI). I need to change the size of 2 or 3 of them. One to avoid kitchen cupboards overlapping window, and to allow for the insulated floor to be higher, another to make the pointlessly large north-facing toilet window a sensible size.

    Question is, what's the best way of doing this? It's easy enough to add a row of bricks along the size to make it 220m smaller, but windows are attached to the wall and rely on it being solid. How does one tie the bricks in well enough to support the window fixings properly? Do I need to cut out the half-bricks and tooth them in (sounds like work). Or use one of those channels that bolt to the wall? Or drill in ties of some sort that go in the mortar layers? Suggestions welcome.

    This is also going to have to be a summer job, because now there is along pause between taking out the old window and putting the new one in (whilst one changes the size and waits for it to set). Not much to be done about that...
    • CommentTimeMar 19th 2019
    Posted By: wookeyQuestion is, what's the best way of doing this?

    I don't know whether it's the best way, but an alternative to brickwork might be to make a timber frame and bolt that to the existing wall. I'm concious that our windows are screwed to OSB boxes that are screwed to 2 no 2x4 (i.e. 4x4 equivalent) uprights, and they rest on OSB on straw bales underneath. So even though they're heavy triple-glazed and some are quite large, OSB and fence posts are strong enough to mount on :)
    • CommentTimeMar 19th 2019 edited
    As Dave hints, an outboard-cantilevering OSB box to mount your new window into can be fixed to existing masonry and/or equally to any secure timber framework - studwork infill, or just a post fixed top and bottom.

    The latter can mean that re-shaping window/door openings, esp if it's a reduction in opening size, can be done just with the EWI blocks if thick enough (150, 200, ... 300 thick?) to have some strength. A post/transom, to define the new reduced opening jamb/cill or whatever then both restrains the free edge of the EWI and mounts the OSB box. Internally you're left with a curious recess (where the existing masonry hasn't been extended) which can be made into some shelves/bathroom cupboard, a curtain draw-back space, or anything ingenious.

    This is another benefit of EWI - window/door opening modifications become easy-peasy - even if only because the usual careful DPC/cavity tray etc work isn't necessary - the existing masonry becomes just a dumb lump that can be modified any way that's convenient.
    • CommentAuthorjms452
    • CommentTimeMar 21st 2019
    You could use these:


    Green hat used something similar to this to build out a block wall to be covered by EWI.
    I would go with dhj's suggestion of building in a timber frame to resize the opening and then EWI over on the outside and do what ever you want t the reveals on the inside.
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