Piers being dug

Holes for the slab's piers are being dug this morning. There are 42 holes 1.5m deep. The piers are necessary to provide extra stability to the slab since the soil gets disturbed after demolition. Digging the piers will take all day. They use sort of a bob cat with a massive drill bit.

Concrete will be poured into these holes tomorrow then gravel will be poured over the ground and levelled and made ready to pour concrete for the slab. The concrete piers will stay exposed when leveling is done. The piers will bond with the slab when concrete for the slab is poured. In essence the slab instead of just sitting on its own on the ground will have 42 piers 1.5m deep to sit on for extra support. This is where a lot of the site cost goes into I guess.