Stop nailing 6 inches from the center.
Valley of roof.
Iko recommends that you install architectural shingles with the open valley method for the best roof performance.
Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.
If the nails are placed in the very center of the valley leakage will occur.
The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
Shingle the other side of the valley the same way.
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.
A valley roof leak is the most common type of roof leak.
A roofer must be careful where the nails are placed in the shingles of valley roofs.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.
Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.
When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.
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.
These leaks can be caused by poor roofing practices or just simply by the age of the shingles on the roof.