How to fix this sheet parts coming off from Gyprock ceiling?
That looks like plasterboard tape - the paper tape placed over the plasterboard joints by the plasterer. https://www.youtube.com/watch?v=UJ17oTw0jkI
If it's loose there could be moisture above…
Deck standards esp re footings ? (Brisbane)
Try this link from Timber Queensland.
https://www.qbcc.qld.gov.au/sites/defau ... _final.pdf
PS. You'll also need a building certifier. Try http://www.buildingcertificationgroup.com.au/
Incorrect roof pitch
Try Don Dixon. He services Brisbane area. http://www.buildingpestinspectionsnorth ... te.com.au/
Phone 0418 222 934
Solid timber 180mm x 19mm secret nailed
It is certainly more complicated and more susceptible to gapping.
Here's what I found online:
http://www.paradise-timbers.com.au/pdf/ ... cedure.pdf
Concrete slab level reference
I'll have a crack.
http://www.qbcc.qld.gov.au/sites/defaul ... uide_0.pdf
76 pages - must be something for you?
Building, Renovating, Extending, Splitter Blocks, Subdivisions, Structural renovations