Wed, 08 Apr 2026 10:32:33 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14833#Comment_14833 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14833#Comment_14833 Fri, 22 Feb 2008 19:12:38 +0000 ali.gill Understand the whole thermal mass/lightweight construction debate but want to know your thoughts on suitability of masonry cavity fill with spray urethane foam to achieve the airtightness discussed elsewhere. Any other solutions to this ..?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14838#Comment_14838 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14838#Comment_14838 Fri, 22 Feb 2008 19:42:59 +0000 Mike George
Also see discussion here http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=61&page=1#Item_19

I would go for partial fill cavity unless you can use rendered external insulation.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14848#Comment_14848 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14848#Comment_14848 Fri, 22 Feb 2008 22:16:31 +0000 tony
Better idea is to do the external insulation Mike just mentioned.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14851#Comment_14851 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14851#Comment_14851 Sat, 23 Feb 2008 00:29:52 +0000 ali.gill thanks, i'm sure i read before you werent keen on keeping cavity for rendered blockwork. with increasing insulation standards that style of construction appears to be becoming uneconomical. any thoughts on spray urethane as a cavity insulation? product blurb looks positive and seems to make sense.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14852#Comment_14852 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=14852#Comment_14852 Sat, 23 Feb 2008 00:32:42 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17066#Comment_17066 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17066#Comment_17066 Mon, 24 Mar 2008 16:20:44 +0000 ali.gill if you're struggling with that - imagine a capital T - bottom right corner is external, theres insulation on top of the horizontal line and to the right of the vertical line, but heat can track through the horizontal line.
even more so if the original cavity is only partially filled.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17087#Comment_17087 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17087#Comment_17087 Mon, 24 Mar 2008 19:07:08 +0000 Chris Wardle https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17089#Comment_17089 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17089#Comment_17089 Mon, 24 Mar 2008 19:14:30 +0000 tony
http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=931&page=1#Item_12]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17106#Comment_17106 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17106#Comment_17106 Mon, 24 Mar 2008 20:54:31 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17108#Comment_17108 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17108#Comment_17108 Mon, 24 Mar 2008 20:59:09 +0000 ali.gill now i just need to convince the client to hack off the render to the front of the house so it can be re-rendered with mesh folded round the corner, where the new external insulation is, to prevent the render cracking where old would meet new.
has anyone found that to be a problem with external insulation systems, cracking render i mean, not convincing clients ? any other solutions to completely re-rendering of the front i'd be keen to hear. the only alternative i can think of is some kind of mastic joint.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17119#Comment_17119 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1287&Focus=17119#Comment_17119 Mon, 24 Mar 2008 23:02:08 +0000 tony
No need to strip the render? go over it.]]>