We have not started building yet (but plans approved by council 4 weeks ago) but we have now been advised we need to raise our slab by 200mm to accomodate the fall in the sewer. The sewer line is along the back fence line, which is also the highest point of the block. From the back fence line, the first 9-10 metre's are relatively flat then the block starts to slope downwards slightly to the front of the block, the fall is less than a 0.5m overall. We are still awaiting details from our builder as to how they will raise the slab.
How do they normally raise the slab height required to the land? I've been advised it can be a combination of extra soil to raise the land height in the building area and then some extra concrete? Is this correct?
If we need extra soil, the builder said we may not be able to use soil from our land. As we are about to arrange the dig for our pool, can this soil be used to fill the slab area? Why would the builder not be able to use this soil when the same soil is on the remaining area of the block and was OK per council approval for the slab before we were advised of sewer requirements?
Would appreciate if someone could assist with some advice as to what is normally done in this instance. Would prefer to use the pool soil if we can, which would save us some money getting soil in for the slab and also save money on tipping fees for the pool soil. This slab raising requirement was not in our budget (and not expected) so trying to see if we can use the existing soil if possible.
Tried to google this but not getting the information I was after so hoping someone on H1 can assist.
Many Thanks