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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthormarsaday
    • CommentTimeJul 9th 2017
     
    I am going to do a suspended timber floor and will have oak floorboards on top.

    Reading about the insulation choices it seems the soft insulation is better than the rigid sheets. So i am going to go with this.

    My joist depth will be 145mm i think. The void underneath is going to be the minimum of 150mm.

    Is it a case of packing the joist with the insulation and use netting to hold it up. Then lay a plastic membrane over the joists and then new floorboards down ?

    As it is new build should i be doing something a bit different ?
  1.  
    What U value will you get with 145mm of 'fluff'? You need 0.22W/m2K for extensions (p.16 of Approved Doc L1B).
    • CommentAuthormarsaday
    • CommentTimeJul 9th 2017
     
    On the kanuf website it seems to say 150mm between the joist of a floor will get 0.22w/m2k, so this seems ok. I do have some 170mm stuff left over from a job i worked on ages ago. Would 170mm stuffed into a 150mm space be ok? OR would i need to remove a little. Seems a shame to waste 2 rolls.
    •  
      CommentAuthordjh
    • CommentTimeJul 10th 2017
     
    Posted By: marsadayWould 170mm stuffed into a 150mm space be ok? OR would i need to remove a little.

    If it's supported underneath by a net then just leave the net a little slack so there's a bit more room. It should be fine.
    • CommentAuthortony
    • CommentTimeJul 10th 2017
     
    Apart from the cold bridge through the joists themselves.
    • CommentAuthormarsaday
    • CommentTimeJul 10th 2017
     
    Wouldn't this happen with rigid board as well Tony ?
    • CommentAuthortony
    • CommentTimeJul 10th 2017
     
    No because I would start with a layer under the joists :smile:
    • CommentAuthormarsaday
    • CommentTimeJul 10th 2017
     
    Well even on this new build i don't think i can fit the boards this way, plus would need to dig out even more for the floor.
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