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Discuss Electric underfloor heating in the Underfloor Heating Forum area at PlumbersForums.net

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Hi folks, an underfloor heating question...

I have a bare concrete floor in the hall way. Can I simply lay flat electric cable heating on this then put floor tiles on top? I`ve been inspired seeing some ornate tiling inside a front door, but want to put cable heating underneath this. Will I lose a lot of heat into the screed? Is there an approved way to do this?

Thanks for any advice!
 

ShaunCorbs

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Loose a lot of it into the uninsulated screed
 

Chalked

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Use 10mm insulation boards, fas end down with powder tile adhesive. Prime the boards, then tile. This gives a food substrate to tile onto and insulates the ufh from heating the sub floor.
 
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Thankyou gentlemen! Very helpful. Its just the floor is obviously all laid, its the original concrete and I cant start digging it up so I`m just considering my options. I suspected I`d lose a lot into the screed.
 
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Did you read my post??
This all goes on top of your existing floor
yes ty Chalked I did. Yes I understand. I didnt want to be raising the floor level (with insulation boards) because I dont want steps between the hallway, kitchen, living room. I wanted a level floor across the downstairs, to allow a smooth, neat transition between rooms.

Thanks again.
 
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Hello everyone,

Steve, we do 6mm XPS polystyrene boards which can be installed by using 1-2 mm flexible tile adhesive. Heating mat goes on top.
I totally understand you don't want to have a little step but if you use the insulation boards we know the UFH will work and will be more efficient and cheaper to run.
It's a much better soltuon rather than using higher wattage of heating mats or cables on top of concrete.
If you can't go for insulation boards you can use a Thermal Primer and 200W/m2 mats but it will cost you more to run.
I've got 6mm insulation board on top of uninsulated concrete with 200W/m2 mat on it and it works perfectly and doesn't cost a lot to run.

Hope that helps.
 

StephenF

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Consider an overlay wet system - cheaper to run. Height change including insulation 24mm.
 
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