Underfloor heating in new and old part of house

HU-209277437

4 years ago

We are just planning for our new extension. We are planning to get wet UFH along the ground floor in the new and old part of the house.

How does it work with putting UFH in the old part of the house....would it need excavation or can it be retro fitted?

Also I understand that you put down out screed over the top once you have put the UFH in. How long do you need to leave screed to dry before you can put flooring on top....I read somewhere it could be as much as 2 months. Is this correct?

Thanks

Featured Answer

obobble

4 years ago

You will need to dig out old floors to put wet ufh in old part if the floors are solid. Pipes are laid over insulation and then screeded over. Drying time depends on how deep it is. It is at least one day per mm of depth but installer or product manufacturer should be able to advise. For us it was 3 months. Even if you think it has dried, put down some plastic overnight and if it is damp underneath in the morning then floor needs further time to dry.

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Comments (8)

Gabby Wong
4 years ago
Not fully aware of all your points.. I think there are super slim systems available that you can get that mean you don't need to excavate down as much in the existing floor but not sure how the price would compare.

but otherwise generally yes, I think you would need to dig down.. and then it depends on the type of subfloor that is currently there, how far down and what kind of prep you'd need... (it's why we ended up not doing it)

and flooring wise we've just discovered... if you're going for Karndean/amtico/LVT they have to have 1day/mm depth of screed that you've just poured before they can pour the latex layer before the LVT! we only found this out really late... and discovered we had a 75mm deep screed... so need to wait 75 days in total.. which overall has delayed it by 2-3 weeks.

They can add an accelerant to the screed that reduces the time by I think half. (but apparently is quite expensive) Not sure about other floor types
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Gabby Wong
4 years ago
Oooo didn't know that tip about the plastic! that's really useful to know! is it enough to put down a small amount of plastic in 1 area? or does it need to be quite a large bit?
HU-209277437
Original Author
4 years ago
Blimey!! That is a long time!! We were thinking of doing the whole ground floor with it....is it a case of you can’t even walk on it??!!

Might be moving out and renting time eeek!!
Gabby Wong
4 years ago
There might be odd days here and there when you can't walk on it at all like when they first pour it.. but most of the time you can... it's essentially concrete, dry and hard enough to walk on... but because the Latex is waterproof, it needs to be completely dry otherwise the moisture can't escape properly and can either cause damp in the walls or end up lifting the flooring (or that's what we've been told!)

A lot of the time it's drying there will still be work going on... plaster boarding, walls, plastering, painting, kitchens, first and 2nd fixes.. etc so it depends how fast they work as to how long you're otherwise completely finished, and just waiting out the floor to completely dry!
obobble
4 years ago
Gabby, we just used a couple of those floor protector mats, but an off cut of dpc or a rubble sac would do as long as they lay flat in close contact so the condensation doesn’t evaporate.
Gabby Wong
4 years ago
Thanks @obobble will definitely do this as an additional check (would be gutted if it pushed it back further, but not worth the hassle if it’s not completely dried out!)
HU-209277437
Original Author
4 years ago
Been researching and came across this:

https://youtu.be/BNtJD9750sw

Just wondered if anyone had any experiences??

Underfloor heating in new and old part of house

obobble

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Gabby Wong

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Underfloor heating in new and old part of house

obobble

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Gabby Wong

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