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TOPIC: Flashing

Attaching metal flashing to stucco

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On 12/22 in 20 degree temps we had a metal roof installed. The roof joins to a stucco house and the contractor attached the flashing (30 lf) to the stucco by nailing it and screws where when he nailed it the stucco cracked and came away from wall approx. 2" in an area 12" x 12" (under window see pic). He then attempted to repair with screws and solar seal #900. Is this the proper way to attach the flashing to stucco? I have attached a picture. Also, does the flashing have to be so large?
Guest User

12/26/2009
Stucco walls are always difficult. Some people tend to try to use to small of flashings. They have not done that here. Howeever, sealant alone is not going to hold the flashing long term. They may need to get a quality adhesive or better yet ask them what they think about using a termination bar to hold the flashing in place.
Todd Miller
Isaiah Industries, Inc.

12/27/2009
Thank you. After doing some additional research I am also wondering if it would also be possible to make a cut in the stucco with a diamond blade (?) that the flashing gets tucked into and then sealed. Is that also a possibility?
Guest User

12/27/2009
I don't know ... that would be good but oftentimes it makes the stucco crack and creates problems.
Todd Miller
Isaiah Industries, Inc.

12/28/2009
Stucco is a pain, but I would have used a 2-piece flashing detail. The metal attached to the roof should not attach the wall also. A second piece of counter-flashing should be installed over what you have. This can be sealed using butyl tape behind the counter-flashing and a good quality caulk. Then secured to the stucco using an appropriate fasteners. These pieces of flashing are independent of each other so they are not tugging on each other. Sorry if this sounds complicated but a professional roofer would know this. This is the easiest way when having to do after the stucco is installed. On a new construction job there is a much better way. Having the window there sitting on the roof doesn't help anything either. Picture is not stucco, but still similar idea. I wouldn't cut into the wall. You are creating a large opening that water can get into and completely destroy the wall. Also there is metal reinforcing mesh right behind the stucco that you do not want to cut.
Guest User

1/23/2010
There is a retro flashing that I have used in the past, a 1/4" deep kerf is cut into the stucco. I drilled a 3/8" hole at each end just incase, to prevent cracking. The flashing just pushes in and locks itself in kinda like a fish hook. Then it gets a bead of silacone. The el flashing slides under.
Guest User

10/2/2010