I have BC sign-off on specification to convert my integral garage. There is already an insulated concrete floor, the specification is to put down DPM (sheet) and then to install 50 x 50 timbers resting on top (shimmed to deal with slope of floor), 50mm PIR between battens and finish with 22mm chipboard.
On further inspection the height difference between the floor of the existing house and the garage floor is greater than 50mm (more like 100mm to 150mm). My question is can I just use larger joists (with shimming as required) and then still use 50mm PIR (with battens to support)?
On further inspection the height difference between the floor of the existing house and the garage floor is greater than 50mm (more like 100mm to 150mm). My question is can I just use larger joists (with shimming as required) and then still use 50mm PIR (with battens to support)?
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