Sun, 13 Sep 2026 20:14:40 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311456#Comment_311456 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311456#Comment_311456 Sun, 13 Sep 2026 10:20:33 +0100 englishjohn
We have settled on 200mm EPS EWI and are now looking at the windows. The wife is concerned that the sunken-window look won’t look very nice. The windows would originally have sat on the blockwork, approximately 200mm inboard of the finished face of the EWI.

I need to move them outwards, ideally in the easiest and cheapest way possible, as I’m having to make some sacrifices due to the costs spiralling.

Compacfoam is expensive, and cutting and setting out individual blocks would also be quite time-consuming for the builder. He has suggested simply using 100mm treated timber, similar to a fence post, and fixing it back into the blockwork, perhaps with some steel brackets along the bottom and possibly the sides.

I would also like to be able to remove the windows from the inside if anything goes wrong in the future, without having to destroy or significantly disturb the EWI.

Can anyone give me any guidance on whether the timber approach would be suitable, or suggest a better/cheaper way of achieving this? Windows approx 3G 1600mmx1700mm, doors 3000mmx2100mm and 2100mmx2100mm.

Secondly, I’ve also been quoted approximately £16/m² for graphite EPS beads to fill the existing cavity. Does that sound about right?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311457#Comment_311457 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311457#Comment_311457 Sun, 13 Sep 2026 13:39:21 +0100 Nick Parsons
We screwed our windows in 'blind' - screws from the outside of the ply, into the window frame, so not easily removeable, but if you fix yours thro' the frames onto the box you'd be able to free the frame from the box. The (literal) 'sticking point' would be how the window is rendered in. If you use Compriband (or similar) expanding air-tight foam tape you could maybe just then do a big mastic bead which can easily be knifed thro' if you need to remove.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311458#Comment_311458 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311458#Comment_311458 Sun, 13 Sep 2026 14:27:05 +0100 englishjohn https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311459#Comment_311459 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311459#Comment_311459 Sun, 13 Sep 2026 19:10:53 +0100 Nick Parsons https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311460#Comment_311460 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18479&Focus=311460#Comment_311460 Sun, 13 Sep 2026 20:03:42 +0100 Nick Parsons https://www.21degrees.com/guides/installing-windows-in-energy-efficient-retrofits/]]>