Green Building Forum - New windows - position in opening Thu, 25 Jun 2026 04:03:41 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=223985#Comment_223985 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=223985#Comment_223985 Fri, 08 May 2015 08:15:31 +0100 Triassic New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=223987#Comment_223987 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=223987#Comment_223987 Fri, 08 May 2015 08:24:02 +0100 tony New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224007#Comment_224007 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224007#Comment_224007 Fri, 08 May 2015 12:40:29 +0100 Triassic Posted By: tonyMake sure the sill works, the further in the more protected they are. I aim for mid point of insulation, certainly in the insulation zone, need to mitigate thermal bridging, what is your cladding? The cladding is larch boards.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224013#Comment_224013 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224013#Comment_224013 Fri, 08 May 2015 13:49:26 +0100 tony New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224024#Comment_224024 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224024#Comment_224024 Fri, 08 May 2015 15:18:58 +0100 Triassic
I've measured the opening size, how much should I knock off to get the window size?]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224031#Comment_224031 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224031#Comment_224031 Fri, 08 May 2015 16:35:04 +0100 tony
Are openings square, level and plumb. I would do 15 off width and 10 off height for normal windows but I am brave, most would take off 20mm cowboys take off more than that!]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224134#Comment_224134 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224134#Comment_224134 Sun, 10 May 2015 15:57:57 +0100 Triassic Posted By: tonyAre they Velfac? If so design in sash site line gaps.

Are openings square, level and plumb. I would do 15 off width and 10 off height for normal windows but I am brave, most would take off 20mm cowboys take off more than that! all openings square and true, so I'll follow your lead on fitting tolerances.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224135#Comment_224135 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224135#Comment_224135 Sun, 10 May 2015 16:23:13 +0100 woodgnome New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224136#Comment_224136 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224136#Comment_224136 Sun, 10 May 2015 18:42:14 +0100 tony
Plenty of vested interests.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224199#Comment_224199 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224199#Comment_224199 Mon, 11 May 2015 20:02:34 +0100 woodgnome 15mm all round.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224405#Comment_224405 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224405#Comment_224405 Thu, 14 May 2015 13:11:40 +0100 djh Posted By: woodgnomeMine advised against foam around frames
Foam isn't squishy; at least most aren't. The normal type is quite capable of bending frames and/or studs. There are some specialist airtight low-expansion foams that would work.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224412#Comment_224412 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224412#Comment_224412 Thu, 14 May 2015 16:53:09 +0100 PeterStarck Posted By: djh
Posted By: woodgnomeMine advised against foam around frames

Foam isn't squishy; at least most aren't. The normal type is quite capable of bending frames and/or studs. There are some specialist airtight low-expansion foams that would work.

Soudal Flexifoam is part of their window airtightness system. Youtube has Soudal videos showing it.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224417#Comment_224417 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224417#Comment_224417 Thu, 14 May 2015 17:34:40 +0100 gravelld New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224419#Comment_224419 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224419#Comment_224419 Thu, 14 May 2015 18:15:58 +0100 renewablejohn Posted By: gravelldHow well does flexifoam cope with the surfaces pulling away from each other? The YouTube video gives a great demo of how it copes with compression.

Soudal Flexifoam is absolutely cracking stuff. Using it to secure our 44mm wide 3G units direct into the stone mullions. Its very accurate using the gun type trigger allowing a beading of foam to be inserted from both sides resulting in a perfect seal. Takes approx 15 mins to form a holding skin and at least 2 hours before you can trim the excess effectively with a stanley knife.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224422#Comment_224422 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224422#Comment_224422 Thu, 14 May 2015 18:31:14 +0100 gravelld New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224428#Comment_224428 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224428#Comment_224428 Thu, 14 May 2015 20:19:16 +0100 PeterStarck Posted By: gravelldYeah it does look neat. But I wonder about the surfaces pulling away. Probably not something you will have in your case. But for instance when filling plasterboard or joinery gaps, it could happen.

From my experience Flexifoam sticks really well to OSB and plasterboard and needs scraping off. Pulling the foam will eventually make it tear.]]> New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224457#Comment_224457 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224457#Comment_224457 Fri, 15 May 2015 10:55:11 +0100 djh New windows - position in opening https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224463#Comment_224463 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13348&Focus=224463#Comment_224463 Fri, 15 May 2015 11:13:49 +0100 fostertom