Valley Roof Framing

Subdivided into the hip valley and cripple jacks.

Valley roof framing.

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. Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction. The rise or height of the roof at its peak is the altitude of the triangle. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side.

In a hip jack the lower ends rest on the plate and the upper ends against the hip rafter. 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. Blind valleys simplify framing. Because most framing lumber is not perfectly straight i check each piece and mark the crown before i start cutting the lumber into rafters.

A no math approach to valley plates. Keeping all of the crowns pointing up prevents waves from marring the finished roof. For more photos and details on framing a roof valley click the view pdf button below. And the line length measurement from the roof peak to the building wall is the hypotenuse.

The run or half the building span is the base of the triangle. Whether you re tying in new gable dormers or adding a chimney cricket during roof framing giving the valley jacks a place to land is an easy task with these step by step instructions.