comments

STAIRS:

i like the stairs, are they going to be connected to the slab? we might need to thicken the slab in this area if we are going to have cast in bolts

BOX GUTTER:

i agree with you Elise the parapet doesn't look too high, also if we have an exposed or slopping ceiling it will not be wasted space anyway.

FOOTING:

if we are having all the tubes filled with reinforced concrete i don't think there would be a need for steel posts, it would be like insitu concrete without the formwork removed, in this case we would need a deepened strip footing anyway even if we have a few that have steel sections inside (unless they are holding a significantly larger load eg. the second floor) i think that there would be no need for piles, as long as the weight is distributed relatively evenly...

however if we are using a steel section ( UB SHS CHS etc.) inside as the primary support we would need to use piles....

i don't think we need to use both systems i think we can choose either, concrete insitu or steel post and beam

i have posted a quick sketch of the options...i hope it makes sense