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Fyi.This is a basement flat in a Victorian property.

Yes we have ensured there is no gap between the sand cement and ply on top. But I'm wondering if there might be a possibility of some vapour going down to the joists and rotting it? Installation instructions don't ask for any vapour barrier but I feel it is a real risk. So trying to find what...

The insulation is fully supported by boards under the joists. I was wondering if I need to polythene sheet installed as a vapour barrier and if so where? Ie just below engineered wood boards? Below the subfloor? Below celotex? Any suggestions?

The sand cement mix is there to retain heat. It is standard practice for underfloor heating on joists so there are no air gaps. The alu plates, etc are alternatives to this method and considered less effective for conducting heat. Anyway does anyone here have an answer to my question On vapour...

As far as I know this is the recommended way of installation. The alu plates are a less effective heating option. I'm looking to hear from someone who has installed this in their property already.

And any additional edge insulation I require.

Hi Andrew, this system is designed to be run between joists. I'm installing per the manufacturers instructions. My question is about the vapour barrier I require.

Hi all, I am looking for some advice re my wet underfloor heating system. I am installing celotex 50mm between the joists and then pinning the ufh pipes to it and covering with dry mix of sand and cement. followed by 18mm ply and then the final board. I was wondering if this sounds fine or I...