Before the slab can be poured the various underslab tasks must be completed. The various hot and cold water lines are laid in and pressure tested.
The heat source for the house is radiant floor heating. Water, heated by a boiler, circulates through tubing under the slab turning the slab into a radiator. Compared to furnace heating the temperature obtained with radiant floor heating is more constant and totally silent. The tubing is held in place during the slab pouring by tying the tubing to a metal mesh. The wire mesh sits on styrofoam which is on top of a poly vapor barrier to restrict moisture vapor from coming up through the concrete slab. More pictures are in the Underslab Gallery.