6x6 slab for garage. Relevant bits of the engineer's spec are "2xD12s with D10 links at 600 and taken 600 into slab. 165mm wide 300mm deep perimeter with new 668 mesh in 100 slab on 150 compacted hardfill (tailings are not to be used). 0.25 poly DPM underneath, 20 MPa concrete at 28 days." Box and prepare site with hardfill, wait for pre-pour inspection, and pour slab. Site has already been cleared of topsoil. Sefton is 30 minutes north of Chch.
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