Essentially there are three main ways to shingle a roof valley.
Roof metal or shingle valleys.
Woven closed cut and open.
Valleys are a very important part of a well designed roofing system.
A chalk line is then used to strike a line from the top of the valley to the bottom of the valley.
Roofing shingles are installed then cut and sealed where they overlap the metal channel.
With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.
Metal valley will last forever.
In addition it is important to avoid nailing the shingles through the valley metal.
Some homeowners prefer the consistent look that a woven valley provides.
For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.
It is made of galvanized steel and will not rust.
Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.
As a single component in the entire system a metal valley effectively protects other parts of your roof including shingles roof felt and the roof deck.
The valley is one of the most critical details on the roof because it collects a lot of water.
To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together.
However the hole that is created from the nail may eventually leak.
Woven valley shingle installation.
These items can be fabricated in many different profiles.
The metal is usually pre painted to best complement the shingles color blend.
Shingles in the valley will not last forever and will have to be replaces during a re roof project but the nails will not leak.
An improper installed valley can be the cause of serious leaks.
Unlikely but it can.
When all roof components are performing well a roof s lifespan is more likely to be maximized.
The three methods to shingle a roof valley.