Downpipe at facade
I'll first explain the roof drainage regulations and will also assume that you are in Sydney metro.
Roof drainage regs for eave gutters are based on a 1:20 year storm event…
Downpipe at facade
Without knowing your region and its 1:20 ARI, the roof pitch, the roof areas and your gutter and downpipe sizes, it is impossible to give an answer.
Extremely Shallow Block
I don't think that there are many volume builders who would have an existing plans of theirs to suit your land. Even if anyone has, I don't imagine the plan…
Noise transfer through duplex common wall - solutions?
Track down the construction/engineering drawings,
your local Council Building department should have copies.
Then have it properly assessed for sound, fire, compliance ,etc.. solutions can be calculated/worked from there.
Zero lot boundary set back
if he has concreted up to the boundary this is fine
if he has encroached on your land then no that is not ok
DA and CDC Campbelltown Council (NSW)
I’m no expert on this but when I built my house in Campbelltown in 2018 my builder went straight to DA because they knew it didn’t comply with cdc rules.…
Discolour on new brickwork
I think that is vanadium staining - that should clean off with the right process.
Google def -"Vanadium stains are a yellow-green harmless discolouration on the face of a…
Weatherboard direct fix or cavity batten?
Sounds silly. The hardieflex is not designed for that use case. Battens are required on all lightweight cladding no question.