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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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      CommentAuthorfostertom
    • CommentTimeFeb 5th 2019
     
    What change of succesfully removing recent pvc windows and re-installing within EWI? The present windows are of average size - 1800w x 1100h 3-light max - fixed in 1 1/2 brick solid non cavity wall, plastered internally, roughcast cem rendered externally.
    • CommentAuthorgyrogear
    • CommentTimeFeb 5th 2019 edited
     
    With very careful workmanship, I reckon that this could be done OK:

    The tricky bit will be getting to the embedded fixings without damaging the window frames...

    This will involve careful demolition of plaster and brickwork in reveals, deconstruction, in order to save the frames.
    However, the structure can doubtless be made good afterwards whereas the frames could not !

    ========
    FWIW, Tom, my experience is somewhat different to your situation, in that we already had the EWI and were replacing old windows with new (part of a tax-scam!) ("read government eco-renovation initiative").

    However, we had seven such windows (all tilt-and-turns) removed (admittedly much older) with no damage to internal finishes, and only minimal interference cutting of the EWI.

    The windows went for scrap except for two that I decided to keep for my (future) shed.
    The method was to unship the opening light, then remove the frame by exploration to determine positions of fixings, which required partial destruction of the EWI to get to them, then fixings were sawed off.

    Then replacement windows were fitted in the reveals per original, viz. half on the blockwork, and half projecting out into the EWI. The fixings were basically the same as the removed ones - side brackets, to the outer blockwork skin, in basically the same positions as before.

    EWI was then made good using PVC mouldings and injection of foam.
    Minimal injection from inside room, then finishing with cover trims.

    So the neat line of window = neat line of external wall as before, and we retain our inside window sills and decoration.

    We also had external electric roller blinds fitted, so these are surface-mounted over the EWI, above the window line, in weatherproof metal caissons.

    The blinds also contribute to thermal and acoustic performance, and to a lesser extent, break-in protection.

    I have photos of all of the above, but on currently broke hard drive... ( another reason for getting latter sorted...)

    Good luck with the adventure !

    gg
    • CommentAuthorbhommels
    • CommentTimeFeb 5th 2019
     
    Same issue here. I am contemplating projecting out a couple of windows to avoid thermal bridges around the reveals when fitting the EWI later.
    When replacing an external door of the same make, it was very difficult to get the lug-and-screw fixings out and in the end I had to cut the door frame to get it removed. With the right tool at hand to get in between the frame and the brick and cut the steel lugs, and/or a lot more patience it would have probably worked out OK.
    • CommentAuthortony
    • CommentTimeFeb 5th 2019
     
    I think if you shift the window out so that the inside of the frame sits 10mm into the outside of the reveal (to carry the weight then angle bracket the centre and top of the styles and above the mullions then it will be fine, lap the ewi over the frame with a positive head drip detail - likely wider sill will be needed or double sill.
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