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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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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 ?
    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.
    • 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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