Most roofers that do shingles will use a heavy base paper instead of a rubber membrane.
Flat valley roof.
Valley areas are prone to leak due to the lack of using proper materials.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
Because of the volume of water and lower slope along valley lines valleys are particularly vulnerable to leakage.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.
Water collects in a valley to flow off the roof.
These leaks can be caused by poor roofing practices or just simply by the age of the shingles on the roof.
Essentially there are three main ways to shingle a roof valley.
A roof valley is formed where two roof slopes meet.
Just enough slope to drain water but also flat enough to be a problem if not constructed properly.
A valley roof leak is the most common type of roof leak.
When a valley is flat like this one in the image it is more problematic.
The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off.
Despite this flat roof valleys should never be built.
Also different architectural styles will use the same type of roof.
This is a granulated roll installed in three feet sheets it is mostly used on commercial flat roofs and is well adapted for residential application especially dead valleys or other troublesome spots.
Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.
There are two basic types of valleys.
Woven closed cut and open.
A roofer must be careful where the nails are placed in the shingles of valley roofs.
The roof design is as essential to the proper function of a house as is the foundation plumbing or electrical design.
Valleys are created where two roof slopes meet.
Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss.
Building a flat roof valley is no different than a plumber installing a drainpipe that is flat for a few feet just to accommodate some aesthetic feature.
Repairing a dead valley isn t really a diy project for most homeowners.
Valleys are a prime leak area so it s important to be careful.
We love the flexibility of a flat roof for certain design limitations but they have a bit of reputation for leaks and repairs.
