Sat, 15 Aug 2026 21:09:58 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6018#Comment_6018 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6018#Comment_6018 Fri, 24 Aug 2007 16:44:05 +0100 IanC I need to redo some of the tiling on the bay window of our 1930s semi, and while I was at thought I'd try and improve the thermal efficiency. The bay itself is brick rather than timber, so no possibility of fillig with insulation. I was thinking of once the tiles and battens were off, putting some thin insulation such as Tri Iso against the wall before battening and tiling. Do I need a gap between the insulation and the wall (I was hoping to minimise the amount by which the tiles pushed away from the wall)? Should I have membrane anywhere as on a roof? Any thoughts or alternatives much appreciated.

Thanks
Ian]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6019#Comment_6019 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6019#Comment_6019 Fri, 24 Aug 2007 17:17:17 +0100 tony
There is also a bit of discussion on multifoil insulation that you must read too before deciding to use it.

Basically insulate between the studs and make sure the whole thing is very airtight between indoors and out especially in relation to the floor void.

Vapour control on the warm side of the insulation and I would re line inside with thin sheet insulation and a lining board vb between the two.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6020#Comment_6020 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6020#Comment_6020 Fri, 24 Aug 2007 18:20:38 +0100 IanC https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6021#Comment_6021 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6021#Comment_6021 Fri, 24 Aug 2007 18:41:21 +0100 tony
In either case I would insulate with something other than multifoil. Sheet insulation behind the battens and/or composite internally

Are the walls on the rest of the house insulated?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6033#Comment_6033 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6033#Comment_6033 Sun, 26 Aug 2007 13:51:07 +0100 IanC
Sheet insulation may be too thick, but if I can get some thin enough, should there be any form of underlay / membrane between that and the wall or between that and the tiles.

Thanks.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6034#Comment_6034 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=597&Focus=6034#Comment_6034 Sun, 26 Aug 2007 16:13:52 +0100 tony
Do you have any cracks to the bay window brickwork? especially in the cheeks?]]>