One of the details that varies between homes is the method of flashing the valley areas of the roof.
Woven closed valley roof.
For a closed valley shingles are installed across the joint where planes intersect.
Further they wear out faster than a metal valley.
The shingles act as the valley lining and protect the surface from water runoff.
There are 4 main kinds of valley installation methods to explore for your roof.
According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s.
With each new course roofing shingles continue up the valley.
A woven valley shingle installation is one where the shingles from both sides of the roof valley extend over the valley and weave together overlapping courses alternately.
When it comes to your closed valley design there are a few options.
There is a variation on the closed cut referred to as a california valley.
Pros of woven valley shingle installations.
There are three common valley details.
These disadvantages are neutralized by their simplicity of installation.
The only type of valley that is unacceptable is the woven valley.
It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves.
In addition there are recognized options for open and closed cut valleys commonly referred to as california open valleys and california closed cut valleys open valley.
Before you decide how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.
All of the shingle rows will need to be lined up correctly.
In this video we explore the california cut woven closed cut and open metal.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Closed valleys or open valleys.
We don t normally offer this line although it is available.
Woven closed cut and open.
Woven valleys should only be used with strip shingles.
Here are diagrams of each style valley style.
Certainteed recommends closed valley for their lifetime landmarks and 25yr xt lines.
Here we have a laminated shingle roof that has been installed with a woven valley detail.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
Essentially there are three main ways to shingle a roof valley.
This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment.
The three basic valley types for asphalt shingle roof systems are woven open and closed cut.
Water has a small chance of even getting up under the woven valley shingles even though it flows in either direction.
Alternatives for the closed cut valley installation are the woven metal open cut and long island installation.
Woven open and closed cut.
