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PostPosted: Thu Aug 02, 2018 8:51 am 
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We have an early 1900's semi, with sound well ventilated suspended floors but without any underfloor insulation. We're needing to look at having the three rooms insulated and level due to a developing medical condition for my better half.

I'm looking at the possibility to install Under floor heating throughout the ground floor at the same time as insulating. One roomneeds to be raised by approx 140mm to meet the others.

Having spent some time searching on best methods etc and coming across conflicting info from Engineering flooring and UFH suppliers, I'm looking at the following set up and would love to hear if it's OK or am I barking up the wrong tree!?

Attached are two images showing that I have to work in two ways...one adding a floating 25 sq/m slab across an existing suspended ground floor to make up the 140mm to reach two other rooms where I need to go between joists to keep the floor as low as I can.

The other two rooms are 20 sq/m each.

I've played around with the Plywoood thicknesses just to balance the end levels, and maintained 70mm on the Celotex.

All comments welcome!


Attachments:
Floating floor 130-146mm.png
Floating floor 130-146mm.png [ 22.26 KiB | Viewed 308 times ]
Kitchen & Lounge between joists.png
Kitchen & Lounge between joists.png [ 16.21 KiB | Viewed 308 times ]
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PostPosted: Thu Aug 02, 2018 9:41 am 
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Can I ask what is your reason for wanting underfloor heating?


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PostPosted: Thu Aug 02, 2018 9:59 am 
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Thanks for the response.

I'm looking for a good amount of flexibility in room layout, because of my other half's developing medical condition we don't know how we'll use two of the rooms or what the layout will be. So having no radiators would be good and I'd need to replace the existing ones anyway within the general refurbishment, so there's a small cost to stay with Rads that can be balanced against any UFH installation.

Also, I've been in houses that have the heating and it just felt nice!!

I'm led to believe that overtime with the right levels of insulation it will be more economical, but I'm guessing this is very marginal as the rest of the house is using Rads and will continue to do so.


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PostPosted: Mon Aug 06, 2018 8:41 am 
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Hi,

Any advice is welcome... :welcome:


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PostPosted: Mon Aug 06, 2018 10:39 am 
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underfloor heating in general needs the system to be on all the time as the time lag can be hours
so if you plan to have the heating on timed :cussing: the room can be cold when you need to use it or hot when you dont
the draughtier the room the worse it is

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PostPosted: Mon Aug 06, 2018 11:58 am 
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Thanks Big-all,

From weeks of research I know that UFH needs more time to get to a decent room temperature but is also slower to drop temperature once switched off, as there's a pretty large thermal mass to handle, but that simply means you switch it on earlier and of earlier too.

I'm looking to dramatically increase the insulation below so it shouldn't leak heat / energy very much, and draughts should be dramatically improved to.

Having stayed in a number of houses with UFH for a few days at a time, I liked the feel of the warmth that UFH gave and the fact there weren't any obvious cold spots in the rooms once you were away from a radiator. I have heard a few people say that they tend to leave the UFH heating on low all the time, but most seem not to...maybe because they have better insulation?


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PostPosted: Mon Aug 06, 2018 12:24 pm 
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just checking you are using your boiler as electric is about 3 times the cost for the same heat output

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PostPosted: Mon Aug 06, 2018 10:51 pm 
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Your concepts appear OK in principle.
You could probably loose the 18mm chipboard & 25mm insulated panel in leu of thicket celotex & a routered chipboard flooring panel like:
https://www.thefloorheatingwarehouse.co ... d-One.html


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