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Believe it or not, it's sandstone (i think - house is c.120 years old) - defo not wood..!
Hacked it all back to solid substrate before giving the first couple of layers of the repair mortar stuff.
It was in such a mess due to a leak in the old gutters directly above, and a crazy amount of buddleia all around the back of the house
hvsds
NotThamesWater
JonoMarshall
Are you building over a rotten wooden sill here?!