Bolting the bottom plate to the concrete foundation before the spray foam insulation is installed.
Plywood attached to the cripple wall studs provides shear resistance. Doing this at the same time as the spray foam insulation is being installed allows for racking strenght, air sealing, and better thermal bridging resistance too.
On the crawlspace portion of the home, typically the spray foam and the sheathing are installed at the same time, so the insulation and air sealing becomes a part of the seismic upgrades.
