Reverse Roof Valley

Iko recommends that you install architectural shingles with the open valley method for the best roof performance.

Reverse roof valley.

The bottom of our blind valley was about 30 inches short of the bottom of the porch roof so we extended the line of the valley down to the edge of the new roof. This recommendation includes iko s premium shingles. No one of this affirmat. 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.

To do this we had to extend the plane of the shed roof out over the porch roof creating a small triangular extension of the existing roof. A reverse gable roof may be part of an addition or it may be a way to install a garage without adding a new roof. The three methods to shingle a roof valley. Soup to nuts riley shows the proper way of installing a valley on a roof.

Shingling both a closed cut valley and a long island valley is the same for the first half of the process. The general arrangement of rafters shown in the larger drawing. Soup to nuts riley shows the proper way of installing a valley on a roof. 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.

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 is an indication that whoever performed this roof installation was not aware of the proper installation method for this roofing shingle. Valley are the second most prone area for leaks on a roof after penetration such as chimneys and vent stacks. A dormer window is an example of a very common reverse gable roof.

Reverse gable roofs are typically perpendicular to the main roof of the house or building. Many roofers cut the shingles across because they say it s safer. Closed cut and long island roof valleys. Figure 18 1 hip jack and valley rafters roof anatomy a.

504 chapter 18 hip valley jack rafters. 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.