Green Building Forum - Floor VCL to walls Tue, 19 Dec 2023 08:39:30 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 Floor VCL to walls http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300162#Comment_300162 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300162#Comment_300162 Tue, 07 Feb 2023 10:20:58 +0000 lngn2
Context:

New concrete slabs with DPM underneath.
PIR on top
Slip membrane/VCL
Anhydrite Screed.

I understand that the DPM should be joined to the DPC in the wall (but can't as the builders didn't leave enough membrane free and I wasn't aware at the time). Seems I can mitigate with a paint-on DPM such as BlackJack or Synthaprufe).

How does one deal with the floor VCL though? Should that also be joined to the wall? I'm tempted to trim it back to floor level and then use blower-proof paint over the junction? Alternatively I could use some sort of tape - Contega Solido?

As an aside, does anyone know how long a concrete floor should be left before covering with PIR? Our builder said it would be OK after a few days (which is what we did) but subsequent digging suggests otherwise and I've had to pull him up on a number of technical points he got wrong and I suspect this may be one?]]> Floor VCL to walls http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300187#Comment_300187 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300187#Comment_300187 Wed, 08 Feb 2023 08:46:50 +0000 tony
VCL is controversial, I prefer a combined VCL and DPM on top of the concrete and insulation (On the warm side of the insulation) it is possible though unlikely for it to collect condensation if on the cold side.

I trap membranes behind the skirtings.

If dpm overlaps dpc in practical terms ok if not black the gap]]> Floor VCL to walls http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300188#Comment_300188 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300188#Comment_300188 Wed, 08 Feb 2023 09:57:32 +0000 lngn2
VCL is in the right place at least. Thanks for confirmation on membranes - black & blower-proof (or similar) it is then!]]> Floor VCL to walls http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300206#Comment_300206 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300206#Comment_300206 Fri, 10 Feb 2023 12:28:34 +0000 GreenPaddy
Jointing the DPM to the DPC level, I suspect the only option is a Liquid Membrane, as you described.]]> Floor VCL to walls http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300207#Comment_300207 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17734&Focus=300207#Comment_300207 Fri, 10 Feb 2023 16:19:01 +0000 lngn2
I was thinking that there's a possibility of moisture-laden air getting behind the PIR upstands at the floor/wall junction and then condensing on the concrete slab?]]>