Last week, the first of the concrete trucks arrived and we poured the east and west footings inside the hotel. This was not part of the seismic upgrade but it was done as a “best practice” to replace the old method of supporting the ground level floor joists
The new footings replace the old wooden shims that originally held up the mud sills under the floor. The old shims served okay for the last 150 years but they were really a makeshift solution that should never have been.
As you can see in this view from under the floor, the mud sill is about 8″ above the top of the stone foundation wall and the gap was filled with a length of 4″ x 4″ and several scraps of pine flooring hammered into place. This has been replaced with rebar and concrete.
The new concrete replaces all the old shims and supports the mud sill directly. This is a top view showing how the floor joists rest on the mud sill and new concrete beam.
The next concrete addition will be sprayed on concrete on the inside of the north and south walls. The prep work for this will be building a grid of rebar and bolting it to the interior of the walls. The concrete will be sprayed over this creating a rigid wall that supports the existing brick wall if and when the big one hits.