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Siding and sealing exterior wall that’s built against another wall

last month

I am building an addition at the back of a semidetached. The neighbour has already built their extension and our extension will be built right up to it. There will be no access to the exterior side of the wall that’s being built right up to the neighbours wall.

I plan to put siding on that wall during framing but would appreciate tips from the community on how to seal the new addition to the old existing home?

Any other suggestions on how to apply siding and seal that wall would be appreciated.

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