Footing and concreteTime to get the foundation trenched and formed.  In this stage of the project which is very different than an ordinary house slab,  the slab in the shower area  must be recessed to allow for a zero lip entry.  All the exterior doors' thresholds must also be recessed to allow for  custom doors with a low threshold. Encino Concrete At this point we are also ready to block out the elevator pit.  Once all the forms are installed a 2 inch bed of sand is covered by a heavy duty plastic (visqueen) followed by rebar every 16 inches in both directions. On  concrete day,  15 trucks of concrete or 150 cubic yards of concrete were pumped in using a special boom pump which took 6 hours.