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Upstand PIR and foam expansion strip?


CH_18

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Hi everyone,

 

I'm in the middle of putting my floor down for underfloor heating. Typical set up, Block and beam floor, Radon barrier, 150mm celotex, 75mm screed.

 

I've put 25mm celotex around the perimeter upstands to eliminate thermal bridge, my question is, do I also need the foam expansion strip around the perimeter also? For reference it's a 75mm sand & cement screed with fibres.

 

Thanks

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