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    • CommentAuthordelprado
    • CommentTimeMar 13th 2017
     
    I am planning on using wood fibre batts in between my joists for soundproofing and to try and keep even temperatures across the house, but before I put the floorboards can down, shall I put a membrane on top to make it air tight? I think there could be some merit in that, but on the other hand, it seems a bit OTT.

    I am also planning on putting a layer of ply on top of that/under the floorboards. So if I spilled a drink or something it wouldnt go into insulation. What is the thickness depth I could get away with? Boards are at uneven centres - between 27 and 25cm

    Thanks
    • CommentAuthortony
    • CommentTimeMar 13th 2017
     
    No membrane needed

    Seal all air paths from below and between rooms upstairs.

    4mm ply or hardboard ove the floor boards should be ok
    • CommentAuthordelprado
    • CommentTimeMar 14th 2017
     
    I've come across the smart ply stuff, which seems sensible - zero formaldehyde OSB. Only in 15mm though. Is lower formaldehe worth it do you think?

    Also, should plumbing pipes be insulated if they are within the insulation envelope? Conscious I want to keep my notch sizes to a minimum
    • CommentAuthortony
    • CommentTimeMar 14th 2017
     
    15mm too thin as flooring, ok over floor boards, formaldehyde is short lived in heated homes,

    I don't believe in insulating pipes inside the house, no need in the notches though unless copper pipes, then use wrapping or clout to prevent clicking. The heat will all escape from the pipes just slightly more slowly.
    • CommentAuthordelprado
    • CommentTimeMar 14th 2017
     
    Thanks Tony. I wasn't going to use the 15mm on its own, it was going to be below the old floorboards.

    For the notches, I was going to use these, which look great!
    • CommentAuthordelprado
    • CommentTimeMar 14th 2017
     
  1.  
    Posted By: delpradoI am also planning on putting a layer of ply on top of that/under the floorboards. So if I spilled a drink or something it wouldnt go into insulation. What is the thickness depth I could get away with? Boards are at uneven centres - between 27 and 25cm

    If you are going to put the ply under the floorboards it will take no structural load - so why 15mm ply? I would have thought 10mm OSB3 would be fine. (I don't like thiner OSB 'cos its a bit too flexible in handling and the price differance is peanuts).
    • CommentAuthordelprado
    • CommentTimeMar 15th 2017
     
    Thanks Peter. I had (without any application of logic) just thought it would feel more "solid"

    I also thought that a big sheet, very a single floorboard, will spread load better?
  2.  
    IMO any solid feel will come from the stability of the joists and the (about?) 1" thick floor boards. Yes a thick board will spread the load better - but do you need to spread the load beyond the load spreading given by the floor boards? And any way OSB is a lot cheaper than ply and I can't see an advantage to ply in this application
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