Water UFH Which UFH Screed (Thin) - Tile Advice

[Sheldon Overs]

All

Please could you advise which is the best thin screed to go with for UFH?
I know it will be a liquid of some sorts and I presume 40mm is minimum I can get away with? I will be tiling on top. Im trying to maximise the amount of insulation I can get underneath a Block and Beam floor with minimum increase in height.

(If any tilers around Warwickshire want a job and have done UFH type stuff before please feel free to make contact)

Thanks

Sheldon

 

[Flintstone]

You can get a thin overlay system from the likes of schluter and I think the underfloor heating store do one. I can’t recall the exact thickness but 30mm springs to mind, perhaps get in touch with them and see what they have to offer. Also our forum sponsor @Uheat - Jake might have a similar setup

 

[Uheat - Jake]

What's the overall floor height you have to play with from base to finished floor? This would determine the best most suitable system for yourself.

 

[Sheldon Overs]

80mm or 130mm. (house on 2 separate levels at min)
I would like a wet system with screed as I think it would be more efficient than a overlay system.

However with the 80mm Im at a push to get 30mm in there. However 30mm is better than nothing (and seeing as currently floor is just block and beam and screed, this would be better). Im digging up the screed and this 80mm is down to beam. (Maybe 5mm extra to play with door frames etc... as Im renovating whole house)

 

[Uheat - Jake]

80mm or 130mm. (house on 2 separate levels at min)
I would like a wet system with screed as I think it would be more efficient than a overlay system.

However with the 80mm Im at a push to get 30mm in there. However 30mm is better than nothing (and seeing as currently floor is just block and beam and screed, this would be better). Im digging up the screed and this is down to beam.

We've always been told a 50mm Liquid screed in the minimum you can go which would only leave 30mm for insualtion. However @Ajax123 maybe able to advise on another type of screed which can go at a lower thickness.

 

[Chalker]

Building regs is minimum 100mm insulation.

 

[Dumbo]

Building regs is minimum 100mm insulation.

I was thinking along those lines and i wondered if he doesn't have any on top of block a d beam at the moment if it is underneath . But while I am writing this I suddenly thought it may of been a floating floor that somebody has removed and screeded hence lack of room for insulation

 

[Ajax123]

All

Please could you advise which is the best thin screed to go with for UFH?
I know it will be a liquid of some sorts and I presume 40mm is minimum I can get away with? I will be tiling on top. Im trying to maximise the amount of insulation I can get underneath a Block and Beam floor with minimum increase in height.

(If any tilers around Warwickshire want a job and have done UFH type stuff before please feel free to make contact)

Thanks

Sheldon

GYPSOL HTC liquid screed. Minimum 20mm cover to the pipes so with 16mm pipe minimum 36mm. Ignore the buildings regs 100mm insulation... It's wrong.

 

[Ajax123]

Building regs is minimum 100mm insulation.

No it's not.

 

[Ttt1601]

Under floor heating store will custom there overlay system to any depth of xps board and it's a great system

 

[Sheldon Overs]

Thanks Guys

This part of house was extended in 1994 and block and beam put in.
The other part of house is 1967 so is timber suspended which I will have to do without screed system.

The 100mm insulation is irrelevant to myself as its a retrofit renovation and there is no requirement for building inspector on retrofit underfloor heating.

Any advice on pipe size, 16mm or the 22/25?
Do you tile straight onto these liquid screeds?

Thanks

Sheldon

 

[Uheat - Jake]

Thanks Guys

This part of house was extended in 1994 and block and beam put in.
The other part of house is 1967 so is timber suspended which I will have to do without screed system.

The 100mm insulation is irrelevant to myself as its a retrofit renovation and there is no requirement for building inspector on retrofit underfloor heating.

Any advice on pipe size, 16mm or the 22/25?
Do you tile straight onto these liquid screeds?

Thanks

Sheldon

With 80 to 130mm height to play with I'd defintely look at going for a Inscreed system over a retrofix system. Not only are the material costs significantly lower, the inscreed system would be the most efficent system you can install.

 

[Sheldon Overs]

Thanks Jake. I was worried that with only 30mm insulation it wouldnt be as good. However I also have seen people retrofit it with NO insulation (might be a solid floor, rather than block and beam), and claiming heating bills are the same. You have put my mind at rest, just need to crack out with the kango drill!

 

[Uheat - Jake]

Thanks Jake. I was worried that with only 30mm insulation it wouldnt be as good. However I also have seen people retrofit it with NO insulation (might be a solid floor, rather than block and beam), and claiming heating bills are the same. You have put my mind at rest, just need to crack out with the kango drill!

If you went with the Screed Ajax mentioned then you'd be able to squeeze more insulation into the project than just 30mm. If you'd like a quote for materials or any install advice please feel free to give me a call.

 

[Sheldon Overs]

Thanks Jake.
I will do, its a 6 bedroom home that I cant find a contractor to do without me moving out for 4 weeks, so Im having to do most of it myself and splitting house into 2 and doing 2 manifolds.