We went with 2 foot footings directly on the rock. I'm glad we did. A 2-foot barrier bonded to the rock should divert away any runoff moving along the top ot the rock.The plans for the foundation are outlined here.
The foundation contractor (Laroche et fils) showed up with a flat bed and crane that deposited and a nice portable tool shed on the site (see previous post). The excavation had actually left the site more even than anticipated, despite some undulating crevices and depression that caused the water to pool. All in all, the footing ended up having only three steps, and the final height varies by no more than a foot.
This image shows where the footing is at its thickest at the corner of the "shed" extension. The footing actually dips into a crevice in the rock that will act as a natural drain for the north side of the house.
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