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Housing - Renovation: EWI detailing

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  1.  
    • CommentAuthorWeeBeastie
    • CommentTimeJan 17th 2023
     
    Looking to install 100mm of cork EWI to solid brick and at the same time replace the current windows with better performing ones. I have no detailed drawings from the architect of where these two meet. The plan drawings show the insulation ending flush with the brick, and the new windows forward of the old so that the frames cover the join between brick and cork.

    If this is not best practice can anyone point me to a drawing showing how it could be improved to minimise cold bridging? Will the new windows be exactly the same sizes as the old ones? I can't find a builder working in my area who has any experience of EWI so am worried about getting this right. Have read a couple of threads here but being a layperson don't fully understand the text descriptions so a drawing would help.

    Second issue is how to insulate the lead roof of a bay window. Architect suggests doing this internally so the ventilation is not interfered with - if this is the case then presumably the new window would be lowered at the top to accommodate?

    If I lose window size in any of this it's not an issue as they are very generous.
  2.  
    First why cork ad not EPS?

    Best practice would have the windows wholly in the EWI and this gives much deeper internal returns (which I like). If the thickness of the windows vs. the EWI thickness doesn't allow for sufficient external return then as far as possible into the EWI would be the way to go. You can put the main EWI up to the window frame and then add an additional 2-3 cm on the external return overlapping the frame to improve the insulation in that area. Over here it is common practice to frame out the window and door openings with an additional 2-3 cm to give a surround detailing frame to the opening. This is often given a different colour to the main body of the wall when the thin film render is applied to give accent colour to the building.

    Sorry I can't help with the bay window - never done it!
    • CommentAuthorWeeBeastie
    • CommentTimeJan 17th 2023
     
    Thanks Peter, I follow your description.

    Cork for the reasons other people on here have chosen cork. EPS below ground.

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