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Green Building Bible, Fourth Edition
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General: Loose fill insulation

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  1.  
    • CommentAuthorPete23
    • CommentTimeJan 27th 2024
     
    Hi all.. my neighbour has built a garden pod and has ended up with square(ish) cavities between the floor framing (on top of solid ply) which are 600mm x 600mm (but with wedges in the corners) and 100mm deep. He's going to lay engineered wood flooring and is wondering how best to insulate. I was thinking a loose fill for the cavities and then maybe a rigid insulation (25mm of PIR or similar) to run over the floor joists under the engineered floor..
    Does anyone have any better ideas and/or recommends for loose fill insulation and best performing thin rigid insulation to go under the laminate floor?
    Thanks!!
  2.  
    I would be concerned that the rigid insulation over the framing will over time become compressed by the point loads of the frames in walk areas to give a floor that dips as you walk over it. I think that OSB or ply or some other sheeting should be place over the framing to prevent the rigid insulation becoming compressed.

    Depending upon the engineered floor it may be possible to dispense with the insulation over the framing if the finished floor can span the framing voids (manufactures advice here). If the framing is actually 100mm then 80 grade 100mm EPS cut to size between the framing and foamed in would work and if more insulation is needed then more EPS over the lot and the flooring laid on that..
    •  
      CommentAuthordjh
    • CommentTimeJan 27th 2024
     
    Rockwool or EPS beads between the joists. You can't put flooring on insulation, unless the insulation is supported underneath by a smooth floor - as PiH says it will compress otherwise, not to mention not being strong/stiff enough to take the weight without bending and thus not supporting the floor.

    It perhaps would have been better to build with the joists/framing under the ply in the usual way.
    • CommentAuthorPete23
    • CommentTimeJan 29th 2024
     
    Great - thanks for the help.. will pass this on to my neighbour!

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