Customer had a deck built a few years ago , no flashing was installed . He has a leak in his basement which appears to be coming from the lag bolts holding the ledger onto the house.
I thought about pulling the first deck board against the house and cutting into the stucco and flashing with coilstock and silicone caulking. I don’t want create anymore problems by cutting into the stucco. Just caulking might work for a while but will eventually fail.
How has anyone handled this situation in the past?
Replies
maybe you could do a curf cut into the stucco and not all the way through it and then tuck the coilstock into that and caulk it with a good roofing caulk, instead of cutting all the way through it and tucking the flashing behind the stucco???
I would do a two-piece system.
The primary flashing covers the ledger board and runs up the wall a few inches. Do this first.
The second piece (counterflashing) is an ell profile with the short leg inserted into a 1/2" deep kerf cut with an angle grinder or circ saw using a diamond blade. Fill the kerf with polyurethane caulk to match the stucco or the metal color, then insert the counterflashing. Mask above the kerf to keep the caulk line straight. Brace with temporary supports off the deck until it cures, and smooth it/pull the tape masking right away.
The counterflashing overhangs the primary by an inch or more. Its lower edge should wing out at 45 degrees to form a drip edge so water doesn't wick back up between the two pieces of flashing.
Bill