Iko recommends that you install architectural shingles with the open valley method for the best roof performance.
Valley of roof.
When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.
This recommendation includes iko s premium shingles.
These leaks can be caused by poor roofing practices or just simply by the age of the shingles on the roof.
A roofer must be careful where the nails are placed in the shingles of valley roofs.
Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.
Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.
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.
Shingle the other side of the valley the same way.
Stop nailing 6 inches from the center.
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.
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.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
Roof one side of the valley running the shingles across it.