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Heating and cooling: UFH between timber joists - spacing?

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    • CommentAuthorSprocket
    • CommentTimeFeb 26th 2019 edited
     
    Refurb of an upside down house (ie. Upstairs is main living space).
    Floor upstairs will be 20mm engineered oak boards directly on top of timber joists

    UFH pipes that are all to be replaced are supported in trays between the joists. How important (or not) is UFH pipe spacing?
    I can see it being tricky to get 100mm spacing here, and even if we can, surely the heat delivery is limited by all the air around the pipe?

    Might there be some interesting but practical solutions to this that I am missing?
    • CommentAuthortony
    • CommentTimeFeb 27th 2019
     
    Depends on heal loss of building and temperature of water some go 100mm I did 300mm under my floor but dont use them

    lower the temperature the better and that means closer spacing

    in my lounge the temperature of the water is 22C if my mother in law come to visit and i switch it on
    • CommentAuthorSprocket
    • CommentTimeFeb 28th 2019
     
    > if my mother in law come to visit and i switch it on

    LOL :-)

    Did you put the pipe in some sort of foil-faced PUR former?

    We can do 100mm spacing downstairs where we have normal screed floors, no problem.
    It's just tricky between the joists. I did not want to go to the trouble of putting 4-lengths in each joist-space if the pipe is too insulated by surrounding air to benefit.
    •  
      CommentAuthordjh
    • CommentTimeFeb 28th 2019
     
    Posted By: SprocketIt's just tricky between the joists. I did not want to go to the trouble of putting 4-lengths in each joist-space if the pipe is too insulated by surrounding air to benefit.

    If the pipe is insulated by air, then that would be a reason to put more pipe in, not less. You would need to increase the area to get the same dissipation.

    I don't really understand the problem you're concerned about. Are you worried about maintaining 100 mm distance exactly? I don't think that matters; I think it's the average that is most important. What do these trays look like?

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