Tue, 19 Dec 2023 06:26:18 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298787#Comment_298787 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298787#Comment_298787 Sun, 13 Nov 2022 17:55:01 +0000 Erkindik
Has anyone installed a systems like this? What sort of performance have you seen?]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298794#Comment_298794 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298794#Comment_298794 Sun, 13 Nov 2022 20:07:11 +0000 tony http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298802#Comment_298802 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298802#Comment_298802 Mon, 14 Nov 2022 08:44:55 +0000 PeterStarck http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298804#Comment_298804 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298804#Comment_298804 Mon, 14 Nov 2022 08:52:53 +0000 TimSmall
With UFH you'll probably be operating at 35°C or higher. That increases the temperature difference across the flooring slab (and so the heat loss) from ((20°C - 3°C) - 10°C) = 7°C without UFH, to: 35°C - 10°C = 25°C. So you'll increase heat loss to the ground by about 3x or 4x.

So unless you're prepared to break out the concrete and replace the floor entirely (possible, but hard work, disruptive and messy), then you may be best getting down whatever insulation you can, without UFH.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298809#Comment_298809 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298809#Comment_298809 Mon, 14 Nov 2022 09:48:27 +0000 WillInAberdeen
*Actually someone else did it for us, while we vacated, horrendous messy expensive job.

However, we probably won't do that with our current house because the carbon released by manufacturing the insulation and concrete slab will likely be worse than what is saved from the reduced heat losses.

So we are also looking at the low profile polystyrene boards that come with precut channels for ufh pipes. We noted that the insulation is thin so heat losses are high, as was mentioned above, so ideally we would lay additional insulation below the ufh boards.We'd also have to lay 18mm timber over the top for impact resistance, and floor covering on top, so the total build up gets rather thicker.

You can get low profile ufh based on cement boards rather than polystyrene, which don't need the timber layer on top, but do need more insulation below.

We found previously that adding height to the floor is less of a problem than you might think, we had one floor 40mm higher than another and the difference was taken up by 20mm tapered profile oak thresholds in the two doorways between, no problems.

However we have a fitted kitchen in the room in question so we decided to delay raising the floor until we replace the kitchen.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298812#Comment_298812 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298812#Comment_298812 Mon, 14 Nov 2022 15:29:36 +0000 Jeff B Posted By: WillInAberdeen

We found previously that adding height to the floor is less of a problem than you might think, we had one floor 40mm higher than another and the difference was taken up by 20mm tapered profile oak thresholds in the two doorways between, no problems.

I can concur with this. I did exactly that in my brother-in-law's place and yes, the timber "ramp" was scarcely noticeable. I would love to do it in our lounge but SWMBO is concerned that we would not be able to re-install the fitted carpet properly, apart from all the disruption of course. It would have been an ideal time to do it now as we are installing IWI in this room* but I must admit it is a headache moving bulky settees/armchairs about the place!

*Looking forward to testing this out when ambient temperatures return to normal for this time of year. Currently room temperature doesn't drop below 20C overnight with no heating.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298993#Comment_298993 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298993#Comment_298993 Fri, 25 Nov 2022 07:08:25 +0000 cjard Posted By: Jeff BSWMBO is concerned that we would not be able to re-install the fitted carpet properly,.

Most of the carpet fitters I've met aren't wizards that know something the rest of us cannot fathom; I'm not sure I'd let a concern like that hold up an eco renovation; you could always ask a fitter to come round and reinstall the pre cut carpet as most of the tricky bit has already been done in terms of sizing it]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298999#Comment_298999 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17641&Focus=298999#Comment_298999 Fri, 25 Nov 2022 09:59:43 +0000 bxman
With UFH you'll probably be operating at 35°C or higher. That increases the temperature difference across the flooring slab (and so the heat loss) from ((20°C - 3°C) - 10°C) = 7°C without UFH, to: 35°C - 10°C = 25°C. So you'll increase heat loss to the ground by about 3x or 4x.


All very true But once the soil below the the floor has warmed up how fast is that going to continue I am convinced the loss will reduce to a fraction of that expressed above .

the Delta is going to decline to practically nothing.


Dry soil, after all is not a very good heat conductor .

As Tony says it is the perimeter where you need to concentrate your efforts IMO.]]>