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Nice! What size roof joists will you need to support the living roof?
Also what is the purpose of the floor joists over the slab?
Hovis-
I'm working off a 3.8m span with 400mm centres, and an expected dead load of < 80kg - 2x6 should, I hope, see me right, according to internet fag packet calculations.
(The sketchup file at the moment is 2x5 - which would be pushing it a bit. I can take back the inch from the floor joists, though, as 2x5 is overkill for those)
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Also what is the purpose of the floor joists over the slab?
No real reason, to be honest - people seem to do both framed floors over concrete, or just insulation & chipboard by itself.
I'm inclined to have the joists, as I prefer the idea of flooring being supported by wood & not foam insulation.
NotThamesWater
And here are the plans: