Under floor heating between joists

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Hi,

I am fitting nu-heat DPJ 14 Underfloor heating between the joists in my house. The system uses polystyrene panels fitted between the joists with the pipes fitted on top of this.

The nu-heat information shows "joists at 400mm centres". I have measured the joist spacings and they are at 350-360mm c/c.

Does anyone know if this will be a problem? I was thinking that there might be an issue as the polystyrene comes with the tracks preformed for the pipes so if it was cut at 360mm instead of 400mm then the tracks might not be in the right place.

I am checking with nu-heat but wanted some independent advice.


 
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Just trim them to size to fit between the joists. You're only talking about 40 mm! 20 mm either side. That's three parts of FA...
 

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