I'm replacing a lower roof, which abuts a cement-block wall. I need to
flash this joint. In other places, I've cut a slit in the blocks, and
fit the upper flashing into the slit. I can't do that here. Long story
- basically, there's an opening in the blocks that can't be filled with
masonry. The opening can be covered, though.
I'm thinking to run a strip of wood along the wall at the joint. The
upper edge of the wood could be tapered down for a smooth transition to
the block surface. This would cover the opening, and the flashing
would be attached to the wood. I would then need to seal from the block
wall to the upper side of the wood and flashing. I plan to use mortar
1. What cement to use. I've read that acrylic-modified cement has
considerably improved adhesion to wood/metal. Yes? If so, would
something like Quickcrete Concrete Patch (contains vinyl) be a good
choice? Or, would it be better to look for a stucco product?
Or something else?
2. Should I use wire lath over the block-to-wood transition? I guess I
could even nail the lath into the flashing, though that may be one of
those things that works better in your mind's eye than in reality.