Mon, 25 May 2026 06:11:08 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301206#Comment_301206 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301206#Comment_301206 Sun, 16 Apr 2023 18:28:34 +0100 davidlithy@gmail.com
I am looking at a retrofit project (theoretical study). The project involves the retrofit of a Wimpey no-fines concrete terrace block.

I will be specifying an EWI to the walls, but I was wondering if anybody could kindly offer some suggestions on what would be the optimal solution in terms of thermal bridging/continuity of insulation concerning the single-storey section/flat roof (as attached indicative photo).]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301210#Comment_301210 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301210#Comment_301210 Sun, 16 Apr 2023 20:23:29 +0100 djh https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301214#Comment_301214 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301214#Comment_301214 Mon, 17 Apr 2023 11:14:49 +0100 Mike1 Posted By: djhJust put EWI on the single-storey section as well?This.
BTW, you may want to change your username to avoid spam.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301234#Comment_301234 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301234#Comment_301234 Tue, 18 Apr 2023 09:04:08 +0100 davidlithy@gmail.com
So, the EWI on the main elevation abutment would extend and sit on an insulated single-ply membrane (with some sort of flashing/trim). On the single-storey walls, the EWI would extend up to the finished roof level and again finished with a trim/flashing.

Oops, I will try and change my username!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301237#Comment_301237 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301237#Comment_301237 Tue, 18 Apr 2023 10:55:24 +0100 djh Posted By: davidlithy@gmail.comSo, the EWI on the main elevation abutment would extend and sit on an insulated single-ply membrane (with some sort of flashing/trim). On the single-storey walls, the EWI would extend up to the finished roof level and again finished with a trim/flashing.Sounds about right. We have some aluminium flashing on the roof-wall corners of our flat roof, that were formed to shape by the installers. There's some flashing let into the render on the wall above that roof. In our case we have a parapet around the edge, with an internal downpipe to drain the roof, but you could use gutters and an external downpipe in the usual way.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301278#Comment_301278 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301278#Comment_301278 Thu, 20 Apr 2023 21:54:39 +0100 davidlithy@gmail.com
My wall would circa. 250mm thick concrete, and not masonry.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301283#Comment_301283 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17814&Focus=301283#Comment_301283 Fri, 21 Apr 2023 09:53:41 +0100 djh
The largest load the flashing needs to resist is probably something like a ladder leaned up against it, and a person scrambling on and off it.]]>