Hi guys, I need help
I thought I was almost at site start when I just got a call from the builder saying ordering has asked for our slab design to be relooked at and now it can be a waffle slab rather than a raft slab as they said was needed previously. Contracts have been signed already obviously. We have a sewer easement a couple of metres off the house side and almost half the house has piering and we are on clay (h class but ended up being p)
Is there an advantage/disadvantage on one sort over the other?
The cynic in me says it's because they originally miscalculated the fixed site costs (which was obvious at tender when they tried to take them away but then honoured them).
I view raft slab as more solid and less likely to move but really I have no clue.
Help! How can engineering just change like that?