valley rafter

This number gives the length of the hip or valley rafter per seventeen units of run.

Valley rafter (historically also called a sleeper): A rafter forming a valley (look for illustration showing a valley).

Difference in lengths jacks The jack rafters lie in the same plane as the common rafter but connect the top plate (the wall) or ridge board to the hip or valley rafter respectively.

Since the hip or valley rafter meets the ridge board and the common rafter at angles of 45 degrees, the jack rafters will have varying lengths when they intersect the hip or valley.

Hip or valley rafter per foot of run The hip or valley rafter also connects the ridge to the plate, but lies at a 45-degree angle to the common rafter.