When it comes to your closed valley design there are a few options.
Woven closed valley roof.
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.
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.
The three basic valley types for asphalt shingle roof systems are woven open and closed cut.
There are various techniques you ll need to know for each type of installation which will be explained in this blog.
There are 4 main kinds of valley installation methods to explore for your roof.
Closed valleys or open valleys.
Shingles are overlapped across the valley on alternative slopes.
One of the details that varies between homes is the method of flashing the valley areas of the roof.
With each new course roofing shingles continue up the valley.
Woven open and closed cut.
In this video we explore the california cut woven closed cut and open metal.
Alternatives for the closed cut valley installation are the woven metal open cut and long island installation.
There are two common methods for completing the flashing of a valley in a shingle roof system.
There are three common valley details.
These disadvantages are neutralized by their simplicity of installation.
Here are diagrams of each style valley style.
Here we have a laminated shingle roof that has been installed with a woven valley detail.
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.
For a closed valley shingles are installed across the joint where planes intersect.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
Certainteed recommends closed valley for their lifetime landmarks and 25yr xt lines.
This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment.
There is a variation on the closed cut referred to as a california valley.
All of the shingle rows will need to be lined up correctly.
The only type of valley that is unacceptable is the woven valley.
Further they wear out faster than a metal valley.
Woven valleys should only be used with strip shingles.
Pros of woven valley shingle installations.
The shingles act as the valley lining and protect the surface from water runoff.
We don t normally offer this line although it is available.
It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves.
Essentially there are three main ways to shingle a roof 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.
