Going for 18mm T&G OSB3. Thought being it is a little more expensive, but easier to handle (half the width) and will have little waste as I'd have to cut loads off full square edge sheets to fit nicely on the joists. T&G avoids this.
1. What spacing along each joist for base deck screws? 450mm?
2. Once base deck is down, VCL and 120mm insulation laid on top, I lay the top OSB deck. What to use to fix through this lot? Total of near 160mm.... 200mm screws? Or is there special fixings?
3. What spacing for the top deck fixing? 450mm again?
4. Any tips on hitting the joists? Marking up the wall the position, then snap a chalk line?
Cheers
1. What spacing along each joist for base deck screws? 450mm?
2. Once base deck is down, VCL and 120mm insulation laid on top, I lay the top OSB deck. What to use to fix through this lot? Total of near 160mm.... 200mm screws? Or is there special fixings?
3. What spacing for the top deck fixing? 450mm again?
4. Any tips on hitting the joists? Marking up the wall the position, then snap a chalk line?
Cheers