Intersecting Roof Valleys

An unequally pitched valley rafter is laid out in the same way as the unequally pitched hip.

Intersecting roof valleys.

For roof pitches less then 6 per foot the flashing extends at least 12. The gable and valley roof is a very popular roof design. Where two gable roof lines meet the intersection forms inside corners called valleys. Gable and valley roof.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. The diagonal rafter that runs from the intersection of the ridges down to the top of the walls at the inside. Stop nailing 6 inches from the center. Interestingly you can mix and match roof styles when building a gable and valley roof designs for a cross footprint home.

Fold the top of the flashing over the ridge and nail it off every ten inches or so along the outer edge of the flashing now this valley will carry water off the roof and away from the house. It s also known as a cross gable roof since the home has a cross footprint. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Again choosing the easy way out we opted to build blind valleys aka california valleys where one intersecting roof is built on top of the other.

Shingle the other side of the valley the same way. The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above. Roof one side of the valley running the shingles across it. Applicable for ultravic supervic 7 8 corrugated barnmaster diamond rib double.

To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap. Intersecting roofs using a closed valley must have the same slopes so that the shingle butts line up at the valley intersection. How to install a valley on a vicwest metal roof.