Ice barrier underlayment installed in roof valley.
Valley dies into roof.
This is known as a dead valley.
This type of roof is also called broken back hip and valley roof because the main hips are intconeected by the rafter of gables on one side and the rafter of the valley on the other.
Such buildings may have more than four hips in the roofs and they form valleys at the inside corners.
Pros of woven valley shingle installations.
Dead valleys occur when two slopes come together in a way that does not allow proper natural drainage or very slow drainage.
The following photos illustrate removal and replacement of a closed cut valley with new open metal valley shingles being removed in closed cut valley.
You may notice although it can sometimes be hard to see some areas where the roof drains onto lower pitched or reverse pitched areas that don t naturally drain.
This layering will help direct the water into the valley and down the roof preventing leaks.
A roof valley is formed where two roof slopes meet.
Then rather than cutting the shingles on the high volume roof plane a row of shingles is installed with the exposure edge facing the valley center.
All of the shingle rows will need to be lined up correctly.
Woven closed cut and open.
A roof valley is very prone to leaks especially if you have an older roof.
It installs and looks almost the same as a regular cut valley where the shingles on the low volume roof plane are installed first and pass through the center of the valley by at least 12 in.
Asphalt shingles roofing how to install valley by roofrepair101 more about roof installation at.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
Water collects in a valley to flow off the roof.
You have to cut the shingles back to 1 inch from the centerline.
Essentially there are three main ways to shingle a roof valley.
No need for precise measurement.
The reason why the roof valley is such a sensitive area has to do with all the rainwater and or melting snow that accumulates and flows through the valley on its way into the gutters.
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.
Then lay the shingles on the other side of the roof and again stretch them across the valley a little.
All shingles removed from closed cut valley.
Entire width of new metal flashing properly extends over fascia at bottom of roof.
Draw a 2 inch self stick flashing down the center.
