Sat, 13 Jun 2026 21:11:49 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210453#Comment_210453 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210453#Comment_210453 Sun, 05 Oct 2014 14:29:24 +0100 savagehk Is this something anyone can shed any light on?

We have a shared chimney stack with our neighbour, and originally there would have been backing chimney breasts as well. Ours were removed by a previous occupant, while the neighbour's are still present but have been covered up (and aren't in use!). Is there any benefit to us (or her!) of filling her chimney stacks with leca? (and/or the remaining stack we have - it is cut off in our loft).

We have a moisture problem in our downstairs room where the chimney breast has been removed and are wondering if it could be coming through her unused chimney breasts (at least in part). We have had a roofer to look at the stack and it does need repointing which may not be helping the moisture, but if we are going to re-cap it we might as well fill it at the same time.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210458#Comment_210458 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210458#Comment_210458 Sun, 05 Oct 2014 15:39:43 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210613#Comment_210613 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210613#Comment_210613 Tue, 07 Oct 2014 01:11:10 +0100 wookey
My chimney has two flues and the other is still in use (now lined). That put me off using better insulation with low melting point like polybeads as I'm not sure how hot it gets adjacent to the other flue. Rockwool would be fine, but would it stay dry enough to be effective? leca is pleasingly robust against both heat and damp so seems well-suited for this application. Putting in a foamglass thermal break at the loft level (my chimney is internal) would probbaly be a good idea too, but is a lot of work for limited benefit. Maybe one day...]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210638#Comment_210638 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210638#Comment_210638 Tue, 07 Oct 2014 10:58:31 +0100 haplessDiyer https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210644#Comment_210644 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12636&Focus=210644#Comment_210644 Tue, 07 Oct 2014 12:16:07 +0100 savagehk