What is the fibre screed minimum thickness?
I’m Andy Parkin, Managing Director of the Multi-Award Winning Speed Screed. Let’s talk about fibre screed minimum thickness.
Bonded minimum thickness
Traditional sand and cement screed can go down as thin as 40mm, in a bonded situation, directly onto the concrete substrate. This is defined by the British Standard BS8204-1:2003
Unbonded minimum thickness
When using a slip or damp proof membrane in between the substrate and the screed, the construction type would be classed as unbonded. The fibre screed minimum thickness would be 50mm for a traditional screed mix.
Floating minimum thickness
With floating construction, the minimum for domestic is 65mm, and 75mm for commercial.
Specialist screed minimum thickness
There are other specialist semi-dry screeds that will allow you to go down as low as 10mm bonded, and 35mm for floating construction. These mixes tend to contain the polypropylene fibres, which minimise shrinkage cracking.
Smoothing compound minimum thickness
Some smoothing compounds also contain micro fibres and can be bonded from 1mm upwards.
All bonded screeds would normally require a bonding agent/primer/slurry mix, to ensure that the bond penetrates the substrate. Without there would be a high probability of debonding and failure of the screed.
I hope that helps and gives you an idea of fibre screed minimum thickness.
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