Just the floor slab pours to go…Sep 01, 2016 Posted at 14:06h in Under Construction by Katherine Jaeger …and then the concrete work will be completed and interior framing can begin! The lid for the below-grade room. Waterproofing and backfill are next. This will be a nice patio. The temporary supports for pouring the concrete roof will be removed and then the floor slab will be poured. The hydronic floor heating has been placed, all ready for the first of the floor slabs to be poured.