How To Roof A Valley

Roof one side of the valley running the shingles across it.

How to roof a valley. Overlap metal roof valley sections by 12 inches and seal the lap with a flexible sealant such as polyurethane or butyl on roofs shallower than 5 12. A roof valley is very prone to leaks especially if you have an older roof. The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. You can see in our roof valley photo left that there has been a history of.

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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. For the next two shingling methods closed cut and long island valleys i work out of the valley using laminated shingles instead of working toward the valley with three tab shingles. No one of this affirmat.

Many roofers cut the shingles across because they say it s safer. Where two roof valleys meet for example above a gable dormer a soldered joint is likely to break from the movement. Shingling both a closed cut valley and a long island valley is the same for the first half of the process. Closed cut and long island roof valleys.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. Valleys are a prime leak area so it s important to be careful. When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. The open woven and closed cut methods are demonstrated.

The three methods to shingle a roof valley. 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. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. This recommendation includes iko s premium shingles.

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. Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.