Originally Posted by
Jeff Eastman
Would you agree that:
1- Nails are underdriven?
2- The nail holes should be sealed?
First photo? No.
3- Headlaps nead mastic or appropriate sealant?
First, and more importantly, those are rake tiles used for the ridges. Those should be ridge tiles.
Ridge tiles do not have holes along their sides, they have holes top center. Typically (depending on you wind zone conditions), yes, the ridge tiles need to be "properly" fastened down. This normally means that the ridge tiles are fastened to a nailer below the ridge tiles, and the overlap end of one ridge tile (this is the "headlap") is glued to the end of the tile below, this is the tile with its 'head lapped', i.e., "headlap", (the end which faces up the roof and which is nailed or screwed down) with roof tile adhesive. NO OTHER TYPE IS ALLOWED, only "roof tile adhesive". Ohio Sealants is the first, and major, manufacturer of roof tile adhesive, their RT 600 adhesive (RT for Roof Tile). "Headlap" consists of two tiles, one is overlapped (the bottom tile) and one is underlapped (the top tile), with the distance of the overlap being the "headlap".
4- Lead flashing should overlap next adjacent tile crown?
Not required. That flashing is shedding water over the tile which has the vent penetrating it, now it is just like the tile itself over the tile below.
Now, that photo with the hip ridge tile, and the three plumbing vent stacks, well ... THEY ARE JUST PLAIN FLASHED WITH THE WRONG flashing.
The other flashing in your photo was an 'on top of the tile' flashing, indicating this roof is a System One ... ALL the flashings should be 'on top of the tile' types.
Besides, those on those three vent stacks, they look a lot like Type B vent roof flashings, not plumbing vent flashings, and not for a System One tile roof either.