Another option If i were to use sleepers instead- heavy work 50x200 H4 - which aren't too expensivethen using data for 190x 45 bearers and joists - s ...

so joists don't need to sit on top of bearers necessarily, they can be built in flush with the bearers using joist hangers and the supported bearer is ...

thank you JacobZ Had planned on 140x45 bearers and 90x45 joists, so pedestals then 1400mm apart on each bearer for support and bearers 1400mm span apa ...