Okay, I am concious that I was inadvertantly hi-jacking someone elses post with my contant questions...... so:
Flat roof on a domestic extension. I am using 9"x 2" joists due to the span. "Builder-mate" suggested using 4"x 3" wall plates on top of the inner block wall to drop the joists onto & fasten them down using joist hangers. The BCO suggested using 9mm Master board to close the top of the cavity to prevent fire spreading etc, etc.
Woody has suggested the (logical) route of leaving the top of the cavity open and continuing the insulation over between the joists. This is going to be a cold deck system with Kingspan between the joists, but keeping a 50mm airspace between the underside of the deck and the top of the insulation. Rather than using a wall plate, simply dropping the joists onto the block work. If going this way, how would I tie the joists down onto the wall? Building the block/brickwork up between the joists will be difficult as I have to maintain the air flow over the top....
Anyone know if this should be okay with the BCO? Although the BCO is good she is very young (straight from college) so obviously doesn't have lots of experience behind her, relying on "text book stuff".
Thanks for any comments.
Flat roof on a domestic extension. I am using 9"x 2" joists due to the span. "Builder-mate" suggested using 4"x 3" wall plates on top of the inner block wall to drop the joists onto & fasten them down using joist hangers. The BCO suggested using 9mm Master board to close the top of the cavity to prevent fire spreading etc, etc.
Woody has suggested the (logical) route of leaving the top of the cavity open and continuing the insulation over between the joists. This is going to be a cold deck system with Kingspan between the joists, but keeping a 50mm airspace between the underside of the deck and the top of the insulation. Rather than using a wall plate, simply dropping the joists onto the block work. If going this way, how would I tie the joists down onto the wall? Building the block/brickwork up between the joists will be difficult as I have to maintain the air flow over the top....
Anyone know if this should be okay with the BCO? Although the BCO is good she is very young (straight from college) so obviously doesn't have lots of experience behind her, relying on "text book stuff".
Thanks for any comments.