Details concrete masonry roofing wrb flashing.
Installing flashing on a roof valley.
Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present.
How to do it determine cuts.
Fold the top of the flashing over the ridge.
Make sure to cover the gap at the bottom of the raised ridge.
Apply an approximately 3 inch.
Install an underlayment centered in the roof valley.
Cut the bottom edge and fold it down over the drip edge.
While roofing professionals occasionally use nails when flashing they must choose whether to nail to the roof plane or the vertical wall.
Two ways to flash roof edges.
Typically flashing is installed using roofing nails and roofing cement.
For the valley areas of the roof you will be using valley flashing.
Many roofers cut the shingles across because they say it s safer.
Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing.
Install the underlayment as directed by the manufacturer then set the valley flashing on top of it.
Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
Some roofers cut the shingles parallel to the flashing s center ridge.
When you install roof flashing you will need to use a sealant.
The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.
To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch.
In order to properly install new flashing you ll have to remove the shingles surrounding your old flashing and then re lay them after installation.
Place a piece of sheet metal under the shingles to make sure you will not damage the flashing.
Snipping off the corners of.
At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter while this is a nice diagram of how these flashings work don t forget our 5 th design rule.
Recommended procedures of basic valley flashing installation.
One common method is to lay the edge metal under the eaves membrane and over the rake.
Especially if you live in an area that gets a lot of snow and ice.
Remember to caulk the underside of the flashing with a sealant.
Flashing is generally installed at any joints or edges in the roof where water could otherwise work its way in.
Step 6 install the flashing.
Before you apply the flashing you ll need to lay down a waterproof membrane.
In this video i show you how i do the valleys on a shingle roof.
