Floor screed thickness + DPM

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Hi
I have a 1 sq m area of concrete floor to damp proof and screed. I was planning to use synthaprufe, blinded with sharp sand and then lay a cement sand screed over. However, the thickness of the screed at a minimum would only be 30mm (it increases to about 50mm across the width). I have read that 50mm is the minimum for unbonded screeds (and Synthaprufe data sheet says it should be a min 50mm).

The area of floor was an old porch which is now internal and part of the hallway, so will get lots of foot traffic. It will be covered in resilient underlay and then 9mm laminate. If I went with the screed would min 30mm really be an issue, and would putting fibres in it help? If not I am into the territory of much more expensive DPM and screed products like Ardex or F Ball, probably about £200 for such a small area.

Any advice would be much appreciated!

Cheers
 
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Bag of self leveler and a bag of sand?
A weak mix of s&c with 25mm celotex over the top?
SBR and fibers would work also.
 
From what I have read you cannot put self levelling screed over synthaprufe or similar bitumen based products
 
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The synthaprufe datasheet says to blind with clean dry sharp sand to provide a key. Are you saying screed on to a wet/tacky top coat of synthaprufe?

What about minimum screed thickness? I was considering adding some SBR to the mix.

many thanks
 
Yeah, the screed will key itself.

20mm is nothing in this context. It won't be going anywhere.
 

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