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Discuss A UFH biggy ?? . in the Plumbing Forum area at UKPlumbersForums.co.uk.

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  1. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Mrs Townfanjon and myself look like we have bought a new house , it wants a fair bit of work and I am seriously considering UFH everywhere . Its not 100% finalised yet but should be within a day or two .
    Floor is suspended timber ( so not ideal ) and its a bungalow as well, so a pretty large area , I have seen the low-pro pipe system and wondered if any of you have tried it.
    Thanks in advance for any thoughts and opinions .
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Insulation below the joists/ infill

    Two option if you can have a bit of extra height then use overboards if not use the alu spreader panels etc
     
    • Like Like x 1
    • Agree Agree x 1
  3. Chalked

    Chalked Plumber GSR

    As Shaun says, take the boards up and insulate. Then either go for spreader plates and cover with fermacell gypsum floor boards. Only trouble doing this, is that the joists can be unequal distances apart and that plays havoc with your pipe centres.
    I’ve used lopro and it works well. You will still need to remove the floorboards and insulate. But then cover with green chipboard. Then install the lopro. You will need a lot of their self levelling, and will be quicker to get somebody with a screed pump to do it. A bungalow could use 4 pallets of the stuff!
     
    • Like Like x 1
  4. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    Leaving the land of the White rose?
    If you're staying, can I have that passport?
     
    • Like Like x 1
  5. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Hell no , dont be silly , and the passport is priceless .
     
    • Funny Funny x 1
  6. bogrodder

    bogrodder GSR

    Don’t use spreader plates, they’re expensive and a waste of time....as you’ve got to insulate it anyhow, I can’t stress about proper 100mm insulation, that overlay stuff is crap to. I’ve used the below method now on three houses and works as good as screeded ufh. Lath along the joists with roofing lath and put 100mm PU insulation across and staple your loops to the insulation and then dry screed 25mm deep to top of joists.. job done!
     
  7. bogrodder

    bogrodder GSR

    I can’t upload an image....damn, says some error
     
  8. Ric2013

    Ric2013 Plumber Top Contributor!!

    I found the spreader plates needed to be made tighter on where the pipe ought to go to allow a proper grip on the pipe and proper heat conduction. Of course, you need to do this before fitting the plates to the joists. You can trim the plates down to size if need be.

    Bogrodder - why are the plates a waste of time? They do seem to spread the heat to some extent. I don't understand what you mean about having to insulate anyway, and how that is related to the use of or lack of use of plates.

    Personally, I have issues with the way we think about underfloor heating. We say that modern, low water content, radiators are good because they have a quicker response time. Then we say that UFH is good because it has a huge thermal mass (especially if you screed instead of using plates).

    So low thermal mass = quick response = good.

    And high thermal mass = slow response = good.

    To me this seems bonkers.
     
  9. bogrodder

    bogrodder GSR

    They’re a waste of time as, they’re very expensive item to purchase and you’ve got to insulate underneath anyhow. They take
    That is another reason they’re a waste of time, the surface contact with the aluminium is probably 60%, so will be very inefficient. At least was dry screed you have near 100% surface contact.
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    And did you consider the extra weight with a screed and as it's timber it will flex but the screed won't and could crack
     
  11. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Thanks to all thus far , the house is too big for spreaders plates , I have them in the bathroom and they are ok , but not a full house .
    Personally I have never heard of a screeded floor on top of a suspended timber floor .
     
  12. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Have another go pal lol
     
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Over boards it is then
     
  14. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Erm . watch this space , not sure yet lol
     
    • Funny Funny x 1
  15. bogrodder

    bogrodder GSR

    shaun why do you seem to always seem to make a habit of diving in nose first, on subjects you seem to nish about.