I'm planning on building a 3-sided lean-to timber shed up against my garage using the garage wall as the 4th wall to the shed. I think I'm happy with the dpc/dpm detail but can anyone please advise the best way to butt the flat roof up against the garage wall for a water-tight junction detail?
The garage wall has a spar-dash render finish and although I suspect it might be asking too much I would like to avoid having to chase into the existing wall.
Thanks