We need to insulate the ground floor, but to take up the existing slab would cost over £2k and be very disruptive - so do we do it? After much debate, the answer is no - we have decided to apply the insulation (130mm phenolic plus screed) on top of the existing slab and expose the first floor joists to compensate for the reduced floor to ceiling height. The PHPP hasn't said no despite the perimeter condition remaining a significant cold bridge.
3 Comments
25/4/2017 08:23:29 am
I can't believe that people live like that! I love this article very much. Great job!
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Dan Gravell
23/6/2017 07:47:56 am
I haven't read further yet, but did you consider taking EWI down to the foundations to compensate instead of insulating the floor? Appears to be good enough for EnerPHIT looking at other projects...
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Dan Gravell
27/6/2017 09:36:27 am
Ah right, yes I can see you did that: http://thebox-haus.weebly.com/posts/footings
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Russel and Anna Hayden
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