I need to replace my garage roof as the sheets and timber joists (and wall plates for that matter!) are knackered. As I'd like to add some insulation I'm thinking of using 5m long insulated sheets. Ideally, I'd like to have a single (steel?) joist at the midpoint but I suspect I may be pushing my luck; can anyone advise? I believe I'd be fine with SIPS panels but they're more costly, and obviously not as quick and convenient to install.
If it's a case of "refer to manufacturers instructions" then so be it, but I thought it was worth asking!
If it's a case of "refer to manufacturers instructions" then so be it, but I thought it was worth asking!