Runoff from the roof falling on the (now removed) deck splashed up on the three corners, promoting rot that was soon exploited by carpenter ants.
Dryrotted materials were carefully removed and replaced with pressure-treated wood. All materials were also sprayed with a mixture of antifreeze and boratic acid: a navy recipe said to kill the dryrot fungus.
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Damage from water and ants
Dryrot removed & lumber dressed, South side
Temporary support, West side
Sill replacements, South side
Rim joist replacement, South side
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Rot removed & dressed, West side
Sill replacements, West side
Rim joist replaced, West side
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Sills and Rim joist repaired
Exterior sheathing applied to South side
Exterior sheathing - 1/2" pressure-treated ply
Membrane
Forenze
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Indications for heatpump supply wiring
Ready for siding
Corner board and siding replaced