1. Waterproofing and Nailing Waterproof the roof deck with peel-…
1. Waterproofing and Nailing Waterproof the roof deck with peel-and-stick membrane such as Grace Ice and Water Shield, lapped up onto the wall. Apply a 1×6 wood ledger to the wall base.
Harry Whitver
2. Membrane at the Joint Cap the end of the ledger board with si…
2. Membrane at the Joint Cap the end of the ledger board with site-bent copper flashing, soldered at the seams, forming a “kickout” to direct water out from the wall. Apply peel-and-stick flashing membrane to the roof and ledger board joint. Apply another strip of membrane to the wall, lapping it down over the ledger board. To protect the roof deck during stucco work, apply underlayment fabric over the waterproofing.
Harry Whitver
3. Integrated Flashing Lay a pre-formed “pan flashing” on th…
3. Integrated Flashing Lay a pre-formed “pan flashing” on the roof deck, with its vertical leg against the ledger. Fasten the flashing to the ledger, high up on the vertical leg. Apply a site-bent copper Z flashing to the house wall, lapping down over the pan flashing. Again, place fasteners high up on the wall.
Harry Whitver
4. Kickouts and Housewrap Cut and fold the pan flashing into a k…
4. Kickouts and Housewrap Cut and fold the pan flashing into a kickout shape at the bottom, to direct runoff into the gutters. Apply housewrap to the wall, lapping bottom edges down over the flashing, and taping any seams or cuts in the housewrap. Install roof tile after stucco is complete.
With their expensive finishes inside and out, high-end homes can be big money-makers. But to work properly, a custom home’s costly exterior materials, such as concrete tile or traditional three-coat stucco, need professionally installed details.
Where a tile roof abuts a stucco wall, experienced builders install a thorough flashing system to make sure there won’t be any leaks. Water running down the surface of a stucco wall—or percolating through its porous cement mass—has to be directed out onto the surface of the rain-shedding tile. And under that tile, the roof needs complete protection—because tile typically won’t deflect all the water that hits the roof.
In this detail, custom-bent and soldered copper flashing, applied over a wood ledger, ties the weather-resistive building paper or housewrap under the wall stucco to the membrane and roofing underlayment that backs up the roof tile. This may not be the cheapest solution, but it’s sure to keep the rainwater out of the house and send it down to the ground where it belongs. —
