Taping Roof valleys
When taping the valleys of ZIP System sheathing, there’s really two ways to do it: you can do it with one strip of our 6-inch tape, or you can do it with two overlapping layers of the 3 ¾. I’m going to demonstrate the two layers of 3 ¾ on this dormer valley right here.
Then install the second layer over the first, overlapping it a minimum of one inch. --- One-inch overlap.
In areas that require the use of an ice-and-water membrane in the valleys, ZIP System tape does not replace that need, so continue to add ice-and-water membranes where required by code.
When taping T-intersections, whether it’s on a roof or a wall, the minimum overlap is one inch. --- One inch minimum overlap.
Rigid metal flashing
Whenever transitioning to a rigid flashing from a vertical surface on ZIP wall, the easiest thing to do is install the rigid flashing and then tape over the vertical lay. That involves whether it’s base-flashing for brick, could be a weep screed on stucco.
Here we got some step flashing on a dormer. It would be the same for all of them.
Simply take your ZIP System tape, and that’s it.