I have a concrete tile roof which butts up against a vertical masonry wall (imagine the roof ending at the edge of a chimney situation). The asphalt cement flashing that comes up from below the tiles are sort of bubbling and peeling off.
So last week I bought a bunch of those rubberized roof patch that you apply using a caulking gun. I first used a utility blade to cut off all the loose peeling areas and exposed the raw masonry. Then I applied a thin layer of this black tar looking like roof patch. Then I applied a fabric mesh over it, after that another coat,
Now I have two questions.
(1) Since this material is black, I need to paint over it as my house is white. Do I need specialized paint? I am thinking of using the Elastomeric paint which stretches more then normal paint? Is that the right kind to use? If so, do I need to prime it? I imagine this being rubbery it will be hard to paint on and need a few coats to cover the black?
(2) My repair is all on the wall surface where the previous asphalt flashing is. Now there is a joint between the wall and the tiles. I wonder do I leave that joint alone? Do I caulk it? or Should I apply the same rubberized roof patch over the joint and spread it over layer I already have on the vertical wall? I think since the tiles and wall moves with the temperature and settlement, if I use the same patch it might "pull" the layer off the wall as the joint moves. May be I better caulk it with another Elastomeric sealer (silicon based?) and not use the same material?
Thanks in advance,
MC