Waterproofing a vertical wall adjacent to the roof


As I prepare my house painting project I made the mistake of going through everything with a fine tooth comb...and I found a lot more than I bargained for.
So now the painting is no hold, until I can fix all the problems...
I have a concrete tiled roof, on three sides of the house the roof extended beyond the concrete block wall with an overhang. On the forth side however, the concrete block wall is taller than the roof line by about a foot. The tiled roof stopped where the wall is. This wall is about 10" thick, as I prep my exterior paint surface I figured I should paint the top of the wall as well, so I climbed up and inspected it, and I saw the paint chipped and bubble on top. So I used a wire brush to brush it to rid of the loose paint, the concrete wall is in perfect shape underneath. But as I brush the top of this wall, I also noticed the "other side" of this wall (which is where it adjoins the roof tiles) has chipped paint as well. In some spots there are some bubbles so I started to brush and peel those as well.
Well turns out on that side where it protudes above the roof line for about a foot, the wall there is not just paint. It is a thicker layer of black asphalt material, cover by paint. I believe this may be the hot mop stuff they did for the roof? So they hot mopped the roof surface then the mopped where it adjoins the wall as well forming a seal across where the two surfaces meet. The roof tiles are OK and solid so there is no reason for me to look under them.
But now what do I do with this partially peeling layer of hot mop asphalt on this 1 foot vertical wall?
I was initially thinking of scoring it along the line where the tiles meet the wall, riping out what is above and then reseal the joint with something (what do I use), then repaint the wall with elastomeric paint.
But now I am not so sure, may be I should only cut out those areas that are badly cracked. Then use some construction adhesive to glue back the hot mop layer to the block wall to keep as much the original water proofing membrane in place as much as possible. Then apply some other sort of sealer before painting.
At the location where the roof tiles and wall meet, should I add on some cement? I noticed some black cement they use to seal the ridge tiles in place and those seem to last a long time and did not crack under the Florida sun and rain. I assume those are somewhat flexible? Can I apply those along that "valley" line to speed up rain runoff and protect the joint better?
I want to get this done before I paint...I hope I can begin to paint soon and not keep on finding other projects!
Thanks in advance,
MC
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intersection should be flashed, and drained. Adding more asphault only gives you a false sense of security. Pick up a roofing book on how the flashing should be done at a vertical wall intersection.
Good luck
miamicuse wrote:

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