Intersecting Roof Valleys

To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap.

Intersecting roof valleys.

For roof pitches of 6 or more per foot the flashing extends at least 9 under the roof covering on each side. Applicable for ultravic supervic 7 8 corrugated barnmaster diamond rib double. For roof pitches less then 6 per foot the flashing extends at least 12. Interestingly you can mix and match roof styles when building a gable and valley roof designs for a cross footprint home.

How to install a valley on a vicwest metal roof. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Gable and valley roof. 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.

Repeat the process on the other side of the hip using the pitch of the hip for the secondary roof 9 5 8 18 13 16. It s also known as a cross gable roof since the home has a cross footprint. An unequally pitched valley rafter is laid out in the same way as the unequally pitched hip. Intersecting roofs using a closed valley must have the same slopes so that the shingle butts line up at the valley intersection.

Stop nailing 6 inches from the center. The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above. The diagonal rafter that runs from the intersection of the ridges down to the top of the walls at the inside. 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. Where two gable roof lines meet the intersection forms inside corners called valleys. The gable and valley roof is a very popular roof design.