How Deep Should Liquid Screed Be Over My Wet Underfloor Heating?

I’m Andy Parkin Managing Director of the Multi-Award Winning Speed Screed. Thank you very much for your question, Julie.

Your question is:

“How deep should the liquid screed be over my wet underfloor heating?”

Watch Andy’s video to find out his answer:

When you have been dealing with traditional screeds that are a lot thicker, people are nervous laying them up to half the depth in some cases (around half the thickness of a traditional screed).

But some products require only 30mm, so liquid screeds generally require just 30mm coverage. If your pipes are 15/16 mm, that means a total minimum depth of 45/46mm. But remember that it is on the high spot. Of course, you are going to have slight variances across the floor. In some places, it could be 5055mm. But the minimum at your high spot is 30mm coverage over the pipes, with most of the liquid screeds currently on the market.

Now, if you are looking to go even thinner than that, there are a couple of fantastic products that you can use that will allow you to go 20mm just over the pipes. That is incredible when you compare it with traditional screeds. A 15 mm pipe means 35mm minimum depth of screed.

These exceptional products are Gypsol HTC and Gyvlon Thermio+. Two manufacturers of the binder that supply to various nationals and independents throughout the UK.

Both products will go down to only 20mm above the pipes. Just bear in mind that the substrate is never going to be flat. You can have high spots and low spots within the floor.

Gypsol HTC and Gyvlon Thermio+ specialist at 20mm above the pipes, and most liquid screeds are 30mm.

I hope that helps with your question. We are here to help! So please get in touch with us with any more questions that you may have.

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