Wed, 10 Jun 2026 09:48:02 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279740#Comment_279740 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279740#Comment_279740 Tue, 07 Apr 2020 10:46:34 +0100 Victorianeco
16mm UFH pipe will be used

And can it just sit on top of the PIR or does it have to be raised further?

Also can each sheet be cable tied together or have I got to use wire ties? Or do they even need to be tied together?

Many thanks]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279747#Comment_279747 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279747#Comment_279747 Tue, 07 Apr 2020 12:13:49 +0100 revor what is the floor covering going to be.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279757#Comment_279757 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279757#Comment_279757 Tue, 07 Apr 2020 21:21:45 +0100 jamesingram for that i think it a useful better way of doing it, but not essential.
i just cable tie them together and lay them on the screed with the uper mesh pointing the way it makes tying the pipes to easier]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279759#Comment_279759 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279759#Comment_279759 Tue, 07 Apr 2020 21:26:03 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279773#Comment_279773 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279773#Comment_279773 Thu, 09 Apr 2020 10:17:48 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279776#Comment_279776 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279776#Comment_279776 Thu, 09 Apr 2020 16:08:44 +0100 revor https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279777#Comment_279777 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279777#Comment_279777 Thu, 09 Apr 2020 21:12:32 +0100 Dominic Cooney https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279778#Comment_279778 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279778#Comment_279778 Thu, 09 Apr 2020 21:13:51 +0100 Dominic Cooney https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279779#Comment_279779 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279779#Comment_279779 Thu, 09 Apr 2020 21:19:12 +0100 Dominic Cooney Insulation was under the slab.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279780#Comment_279780 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279780#Comment_279780 Thu, 09 Apr 2020 21:26:53 +0100 Dominic Cooney https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279790#Comment_279790 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279790#Comment_279790 Fri, 10 Apr 2020 17:18:11 +0100 jamesingram Posted By: fostertomHow do you keep the pattern of pipes in place then?
cable ties]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279858#Comment_279858 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279858#Comment_279858 Wed, 15 Apr 2020 16:03:18 +0100 Mike1 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279935#Comment_279935 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279935#Comment_279935 Sat, 18 Apr 2020 15:59:31 +0100 Victorianeco
Found various links suggesting that too]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279946#Comment_279946 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279946#Comment_279946 Sat, 18 Apr 2020 19:33:38 +0100 Jonti Posted By: VictorianecoChicken wire any good?

Found various links suggesting that too

Yes, chicken wire works well.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279968#Comment_279968 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279968#Comment_279968 Sun, 19 Apr 2020 16:21:43 +0100 Mike1 Posted By: VictorianecoChicken wire any good?
BS 8204 requires the use of either:
50mm square 16 gauge (1.2 mm) welded wire mesh,
D49 (2.5mm bars, normally used), or
A98 (5mm bars).

Chicken wire can be as thin as 0.4mm, and isn't welded. It is sometimes used in DIY, but shouldn't be. It should provide some cracking resistance, but not much load distribution or curl resistance. However trying to keep it flat while attaching UFCH pipe to it might make an amusing YouTube video.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279973#Comment_279973 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279973#Comment_279973 Sun, 19 Apr 2020 20:12:37 +0100 Victorianeco https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279988#Comment_279988 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=279988#Comment_279988 Mon, 20 Apr 2020 08:54:38 +0100 Jonti
I didn't use the chicken wire to strengthen the slab but to set the height of the UFH pipes by bending small pieces into arches to support the piping whilst the slab was poured.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280017#Comment_280017 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280017#Comment_280017 Mon, 20 Apr 2020 23:26:47 +0100 Dominic Cooney Posted By: VictorianecoI actually used a142 mesh in the end. Finished all the UFH pipes literally 15mins ago, all set for the screed Tuesday

Hope it goes well tomorrow with the screed. We still have to do that bit yet on this project.
Currently scratching my head about MVHR install and ducting routes, having taken a delivery from BPC Ventilation today.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280027#Comment_280027 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280027#Comment_280027 Tue, 21 Apr 2020 11:37:25 +0100 Victorianeco
It's up to 100mm in places, how long till:

1. We can walk on it?
2. Till we can run the UFH?
3. Till we can put finished floor down? (likely to be an LVT tile)]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280030#Comment_280030 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280030#Comment_280030 Tue, 21 Apr 2020 12:27:38 +0100 barney
Stay off it for at least a week

What did the installers say when you asked them ?

Regards

Barney]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280031#Comment_280031 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280031#Comment_280031 Tue, 21 Apr 2020 12:42:54 +0100 Victorianeco
But advised to not walk on direct for 2 days]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280036#Comment_280036 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16509&Focus=280036#Comment_280036 Tue, 21 Apr 2020 13:22:05 +0100 Mike1
2) As long as possible - the autumn would be good - and don't be tempted to use the UFCH to dry it out.

3) That depends on the temperature and humidity; 1 day / mm is one rule of thumb, but basically leave it for as long as possible - it will continue to shrink slightly for some months.]]>