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Screed Boards (like Gypdeck Structural 18mm Board) or standard flooring

 
Insulation
Last Post by Transparent 5 days ago
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 sjc123456789
(@sjc123456789)
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Topic starter 26/02/2026 12:19 pm  

I need help!!! (on a number of levels).

Just about to get 100sqm of UFH put in on the ground floor of our house via spreader plates on 400mm joists and wondering what is the best structural board to put on top. Logic tells me (my logic, so it might be dodgy) its best with some kind of screed board that will allow the heat to pass through to the final surface, porcelain tiles or rigid core lvt, something like Gypdeck Structural 18mm board.

My problem is, as i'm fast approaching 60, I might not live long enough to benefit from the ROI, I'm seeing prices from about £30 to £45 sqm for the screed type products, with standard flooring about £8sqm?

what's are your thoughts experience please?

thanks Simon.


This topic was modified 6 days ago by Mars

   
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Transparent
 Transparent
(@transparent)
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27/02/2026 2:13 pm  

This is right up my street @sjc123456789 

I have installed suspended floors with UFH in my own home in several stages:

ufh20sm550

The majority of my floors use 20mm-thick engineered oak planks for the final surface layer.

I buy-in untreated planks (no lacquer) and then use a synthetic brush on a pole to completely seal the wood and joints with two coats of Osmo flooring oil.

 

I have used large-format porcelain tiles within one en-suite bathroom. That has a heavy stone walk-in shower tray which is bedded onto a dry screed above a plywood sheet. Thus the UFH coils go under both the floor-tiles and the shower-tray. That's worked ok, but the 25mm hardwood ply sheet was obviously costly!

 

Your 'problem' comes down to you choosing two types of finished flooring first, and then wanting the UFH to accommodate that choice. I did things the other way around. The engineered oak was the best option to go above the heat-spreader plates!

I'll assume that the option for rigid-core LVT won't be for a faux-wood effect.
Because if it is, then why not use real wood?!

I haven't previously met or used Gypdeck, but it's a type of cementitious board, and I understand those properties. Is your reticence due to its price?

What 'standard flooring' at £8sqm are you comparing with?
That's a low price for a type of sheet which could meet your requirements.

Are you expecting to place those porcelain tiles in a humid location, such as kitchen or bathroom?

 


This post was modified 5 days ago 2 times by Transparent

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