The chimney I’m dealing with is in the middle of a valley. The front of the chimney is not at the lowest slope, but the right corner of front is. So I plan to install a soldered copper “apron” corner piece.
How to install a copper step flashing? I would nail the back outboard corner so it’s overlapped by the next upslope step flashing piece by 2 inches. The first step flashing piece after the apron needs to be nailed in front outboard corner?
How big step flashing should be? NRCA recommend a minimum of 7 inches long by 8 inches wide (bent in half). Would it matter if it’s bigger?
I’m temping to use roofing cement or silicone sealant as a precaution to prevent water from getting into chimney thru step flashing. What is best to seal nails into step flashing? Some people said yes and some said no.