Hello, and thanks for your question!
My name is XXXXX XXXXX I am happy to assist you today!!
do you know what australian building code says about this matter
With any concrete you need to always compact it down as much as you can, Industry standard ANYPLACE calls for compaction. If you dont the the conrete will settle and crack
the sand needs compacting you mean yeah
I am an Engineering contractor in the United States, I know the concrete industry standards
This is how it should go.
and do they have to put a water proof membrane down before they pour?
#1- Backfill and compact the sand until the depth is right. #2- Plastic is put down to act as a moisture barrier. #3- Under pin the existing concrete (drill into the existing concrete and install rebar approx 4"deep and leave about the same amount sticking out. #4- If the slab that you are pouring is going to be (5feet by 5 feet) or larger then yes, put down wire mesh.
Installing the pins into the existing concrete keeps them from becomeing un level later if one trys to settle.
How big is the area he poured??
2m by 3m
Ok, he should have used wire mesh to be safe.
the contactor said because its not a load baring slab (no brick walls on) it dont need rio but the builder says he should have
And it should be approx 4" deep
and because hes laying tiles on it
he said he poured it 130mm
shuld i get him to rip it up and start again and do it properly?
Ok, thats thick enough, the rebar is a saftey that will keep the concrete from going uneven. Load bearing or not, I always do it to be safe.
because i dont want it to crackor start leaking water under as it is a bathgroom
And as far as him laying tile over the new concrete, The new concrete has to dry for at least 30 days minimu before he lays the tiles or they will not stick right
If it was my job, he wojuld be replacing the concrete
ok thanks for the info ill tell him to redo it
thanks for your time
No problem, anytime