Tue, 19 Dec 2023 08:41:17 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299681#Comment_299681 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299681#Comment_299681 Tue, 17 Jan 2023 07:45:29 +0000 WeeBeastie
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.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299684#Comment_299684 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299684#Comment_299684 Tue, 17 Jan 2023 08:30:01 +0000 Peter_in_Hungary
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!]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299689#Comment_299689 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17700&Focus=299689#Comment_299689 Tue, 17 Jan 2023 10:44:43 +0000 WeeBeastie
Cork for the reasons other people on here have chosen cork. EPS below ground.]]>