Valley Between Two Pitched Roofs

Valley gutters are generally considered to be a problem area.

Valley between two pitched roofs.

Explore framing complexities that result when roofs of two different pitches intersect. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Valley tiles which allow the roof to be continued round corners they are special tiles which are the opposite of a hip tile really. A valley gutter is where two main roofs meet or where there is a change in roof direction.

For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. 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. This slope and skew calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof. The materials they use in valleys are inferior.

In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Most roofers know how to install shingles but many have no clue how to do a valley. The valley gutter problem areas can be made worse where there are surrounding trees and associated leaves and branches that can block the valley gutters up.

A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration. They can only be used when the pitches of the two roofs are identical. We may not know how to spell but roofing we know best. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons.

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. An open valley often 100mm or 150mm wide with a metal normally lead or sometimes a grp lining. Repairing a valley area on a shingle roof. Determining the slope and skew angles related to hip and valley beams can be a challenge made even more difficult when the roof slopes on each side if the hip or valley are different.