This article series discusses best practices in the selection and installation of residential roofing.
Open cut valley roofing.
Although the open valley is recommended by the manufacturer closed valley is acceptable.
Closed valleys are very vulnerable to mechanical damage.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet.
The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment.
I begin the second side the side that will be cut by snapping a cutline 2 in.
Water collects in a valley to flow off the roof.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks.
Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled.
Woven closed cut and open.
A roof valley is formed where two roof slopes meet.
It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves.
From the valley center.
With a closed cut valley there s no need to shingle the two roof planes at the same time.
Roofing shingles are installed then cut and sealed where they overlap the metal channel.
For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.
We describe how to construct three common styles of roof valley.
However it is said that provided the rest of the roofing shingles were properly installed and are performing properly open valleys will perform better over time than closed valleys.
Essentially there are three main ways to shingle a roof valley.
The metal is usually pre painted to best complement the shingles color blend.
In this video we explore the california cut woven closed cut and open metal.
People working on your roof especially less skilled trades or homeowners invariably use the valleys to walk on.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
With a clean valley you can lay down some peel and stick roofing membrane.
There are 4 main kinds of valley installation methods to explore for your roof.
We don t normally offer this line although it is available.
Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications.
