Replacing an asphalt roof where there are roof to stucco wall joints
I am talking to roofing companies to get estimates for replacing my 20 year old asphalt roof. The thing I am not comfortable with is what I should be requesting to be done where the roof meets a faux stucco wall. See the picture. That one probably leaked and prior owners caulked it with a 1″ wide bead of caulk. I have seen diagrams of how to do this when building new with a spacer, step flashing, Z counter flashing and then stucco over the top section of the Z counter spacing. But this is a roof replacement.
Most likely the roof was done first with normal step flashing and then latter on the stucco people came and put stucco over the step flashing. But in some places it must not have been done properly or they would not have caulked the joint in the picture.
Many roofers do not seem comfortable when roofing against a stucco wall.
What do I tell the roofers I want done? Maybe I will need to hire a stucco company after the roof is installed to repair stucco that needed to be cut away to properly flash.
Replies
Have the stucco cut away; Z flash it the way it should be done; and have a good stucco contractor patch the stucco. In other words, do it right.
Step flashing is the correct way unless you’re in Florida.
The stucco needs cut back and step flashed.
Z flashing depends on caulk, don’t use it
Cut or break back stucco and have new step flashings run all the way up around the corner to the peak and a new kickout put in at the bottom. The two layers of D paper behind the stucco need to be lapped over the step flashings. patch in stucco.
That is a poor (but common) design where the valley runs right into the corner of the chimney or house. Although you said it's caulked which would usually mean it's not done properly, it doesn't have the discoloration and mildew of a leaker that I can see. If it was flashed properly and is only 20 years old the step flashings can stay in place and be reused if in good condition.