Hi All

I am hearing conflicting info about which floor screed is best to use for ufh.

We are laying water underfloor heating in our new home. We will be putting floor tiles down as the finished floor. I have heard that tile adhesives can react with certain screeds and that you have to be careful regarding drying times etc. I have read somewhere that dry is not as effective and therefore more costly to run than wet screed.

Please can someone help with advice on the pro’s and con’s for each.



  • Mark Brinkley

    I’m not sure what you mean by ‘dry’ and ‘wet’ screeds. Normally a screed is laid wet and you have to wait for it to dry before you put any cover on it. Laying floorboards on a screed that still contains significant moisture (i.e. is still ‘wet’) is bad news. But the performance of an underfloor heating system shouldn’t depend on how wet or dry a screed is.

    Having said that, there is a significant move towards using pumped screeds made of calcium silicate rather than sand and cement. There are issues with chemical reactions with pumped screeds and it is recommended that you cover the screed with a membrane after it is laid and fully dried. But the drying times on these screeds tend to be a little shorter than on traditional screeds.

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