Minimum Screed Thickness?
Minimum Screed Thickness
I’m Andy Parkin, Managing Director of the Multi Award-Winning Speed Screed. I’m here today to talk about minimum screed thickness.
We are often asked, “What is the minimum screed thickness for my project?” To answer that, we have to look at the different types of floor construction.
Bonded
Bonded screed is when the screed is bonded directly to the substrate. The requirement would normally be for a structural substrate, such as concrete, beam and block, and concrete plank.
Unbonded
Unbonded construction is where you have a membrane in between the substrate and the screed. Once again the substrate would normally be a structural one, however there are a number of structural screeds.
Floating
Floating construction is where you have either acoustic insulation or thermal insulation in between the substrate and the screed. Often, there is also a membrane over the insulation. Once again a structural substrate is the norm.
Each one of those types of construction allows for a different minimum depth.
Bonded Minimum Screed Thickness
Various products can be used for this type of construction:
- Smoothing Compounds – feather edge to 10mm
- Traditional Sand and Cement – 40mm
- Modified Sand and Cement – 10mm – 40mm
- Calcium Sulphate TS-15 – 15mm
Unbonded Minimum Screed Thickness
Generally with a membrane between the substrate and the screed.
- Traditional Sand and Cement – 50mm
- Modified Sand and Cement – 35mm – 40mm
- Calcium Sulphate TS-15 – 15mm
- Standard Calcium Sulphate – 30mm
Floating Minimum Screed Thickness
Projects generally with thermal or acoustic insulation between the substrate and the screed.
- Traditional Sand and Cement – 65mm Domestic & 75mm Commercial
- Modified Sand and Cement – 35mm – 40mm
- Standard Calcium Sulphate – 35mm Domestic & 40mm Commercial
I hope that give you some idea of the minimum screed thickness for your project, and if you would like any further information please contact us.
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