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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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  1.  
    Hi all,

    After a bit of a break, I'm cracking on once again with the timber framed bungalow renovation.

    To re-cap, the original external walls are comprised of (inside to out) 6mm board, 3" uninsulated stud, 1" weatherboard, .5" cavity and pebbledash on chicken wire. This is being improved as I work around the house to plasterboard, 7" insulated stud, 1" weatherboard and 100mm EPS EWI.

    I'm going to be turning a large cupboard in to a little shower room next. This cupboard, it would appear, used to form an inset porch way entrance to the house, and at some point a single skin of blockwork has been applied with window above, parallel to the original timber walls to block off this entrance and make the area an internally accessed space. Given that the exterior is going to be insulated in EPS EWI, how should I insulate this small section block wall internally? When finished, this wall will form the end of a tiled shower cubicle.
  2.  
    Posted By: alexoftheorchardGiven that the exterior is going to be insulated in EPS EWI, how should I insulate this small section block wall internally? When finished, this wall will form the end of a tiled shower cubicle.

    IMO the best approach would be to make the EWI sufficient so that the inside does not need insulation - then you can tile straight onto the blockwork.
  3.  
    Ok Peter, sounds logical, but this would mean this little section is less insulated than the rest of the house. Do you think that'll be no big deal given that it's going to be a shower cubicle, and as such any condensation on the tiles is hardly a concern?
  4.  
    A quick calculation of you wall (a bit ruf and ready) gives a u value of 0.14. Your shower room block and 100mm EWI is about 0.30, putting on 50mm of IWI gives about 0.22 and 100mm of IWI gives 0.17.

    Alternatively tile directly on to the blockwork, live with the 0.30 u value and put in a bigger rad!

    If you are going to have any sort of MVHR then the shower room will probably have an extract vent any way so lots of air change so condensation won't (shouldn't) be an issue
  5.  
    Yes good point, it'll have an MVHR vent in and the room is teeny tiny, so very little space to heat anyway. Thanks, that makes life easier and gives me a slightly bigger shower without the IWI!
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