Floor Screed Thickness?

I’m  Andy Parkin, Managing Director of the Multi Award-Winning Speed Screed. Let us take a look at floor screed thickness.

We are often asked:

  • What thickness do I need?
  • What thickness can I go down to?
  • What is the thinnest?
  • What is the maximum?”

We need to put it into the context of the three main types of construction that you are likely to encounter when looking at floor screed thickness.


First of all, you have got bonded.  That is where the screed is actually bonded directly to the substrate.


Unbonded, this is where the substrate has a membrane separating it from the screed.


And then floating. That is where you have got acoustic or thermal insulation in between the screed and the substrate, and you may also have a membrane as well.

If we look at each different type, you’re going to have different floor screed thickness on the minimum and maximum depths.

Bonded Screed Minimum Depth

Bonded Screed Maximum Depth

  • The maximum depth you would use a smoothing compound would generally be around out 10mm, you can add aggregates, to bulk up the screed going up to 30, 40, 50+mm. If you are getting up to the 50mm, you would question whether you want to use a smoothing product really just from an economic point of view, because it is going to be very expensive.  There are far more cost effective alternatives products out there.
  • Modified sand and cement screeds can go up to whatever thickness you would like, however you would question doing so, if you are starting to get up to 150mm, 200mm.  At those kind of depths, you would using void formers (insulation and then screed on top).
    It is rare that you will see screeds going in above 150 mm, however it is theoretically possible, providing it is compacted in layers. It is possible, but you would question as to why you would want to do that.
  • Traditional sand and cement is the same as above and doesn’t have an upper limit as such, but you would question anything too thick.

Unbonded Minimum

Unbonded Maximum

Floating Minimum

Floating Maximum

I hope that gives you an idea of the thicknesses you can start at, and you can go up to. But please feel free to contact us for any further advice.

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