9,000 sf pre-school in San Ramon, CA
Attached are 10 sequence photo's of the Wafflemat foundation-forming system at the
Goddard Preschool in San Ramon, California. 1,700 Waffleboxes were placed in the
9,000 sf slab. The initial concrete estimate was 300 yards, the actual about 280.
The concrete pour began at 7:00am and was completed about 1:00pm.
Of special note is the beam spacing the structural engineers (Advanced Engineering
in Brentwood, California) utilized in the foundation (12" instead of the standard
6" at the bottom of the Wafflebox) because of the loads that need to be supported.
A little extra work was involved in making the larger spacers -- simple rebar bent
downward at the ends to be placed in the W/box's existing holes -- by the foundation
subcontractor (Encore Construction, Tracy, CA), but the savings in soils work that
would have been done if Wafflemat was not used -- estimated by the GC (Proforma
Construction, Pleasanton, CA) to be several thousand dollars -- was worth it. And
then there's that superior performance in expansive soils vs. the alternative uniform
thickness slab . . .
Super job by all involved.
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