Picking suitable UFH for tiles - and correct method for installation

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Hi all

We are having an extension built. The kitchen will be approx 6m x 4m. We want a tiled floor (probably slate), and under-floor heating. I am trying to determine the best system to go for; as well as the best method for the tiling.

This is what my research has uncovered- I would appreciate comments to validate or correct the below.

1. Water system under screed.

Pros: efficient. Seemingly easy to find a system that accommodates tiles. The plumber does the hard work and the builder puts a level floor in place for me to tile on to - nice and easy for me

Cons: builder says that laying the screed on to a water based system is a pain (barrow cannot go over pipes) which will cost me money. Screed takes a month to dry before we can turn heating on - we move in in December. Expensive to buy and expensive to fit.

2. Water system over screed

Pros: efficient. Builder is happy - no need to screed over UFH. quick - Don't need to wait for screed to dry before using it.

Cons: expensive. I can't find an over-screed water system that is suitable for tiles. Unclear how I tile on to one: do I need to pour SLC first?

3. Electric system over screed:

Pros: cheap. Builder is happy - no need to screed over UFH. Surely cheaper to install on the basis that I can lay the insulation, roll out the mats and the electrician can connect them up to the mains. Quick.

Cons: inefficient. I do more of the work and I still don't know how to tile over it - do I need SLC first?

Any comments or advice would be welcome!
 
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Hi David, cant comment with regards the wet UFH, but i know alot of our installers/fixers are liking the Vario Pro electric UFH. Basically its a cable that is installed over a decoupling matting, meaning your tiles will not crack and you also do not need to screed over, with flexible tile adhesive simply back fill the matting, then tile.
 

L95

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Warmup Prowire for me. Fix it to the screed and tile over it. Just make sure your builder uses a plastic trowel.
 
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