What type of rafter forms a valley in roofing structures?

A valley rafter is specifically designed to create a valley in roofing structures. In roofing, valleys occur where two sloped roofs meet, allowing water to drain effectively. The valley rafter runs diagonally between the two slopes and supports the roof while also guiding water flow into the gutters.

Understanding the role of each type of rafter is essential in roofing design. A common rafter extends from the ridge down to the wall plate, providing the primary support for the roof's surface. A hip rafter, on the other hand, is used at the intersection of two roof planes that slope downwards, and it forms the outer edge of a hip roof. Lastly, a jack rafter supports the roof and connects to the common rafter or hip rafter but does not specifically define the valley structure. Therefore, the valley rafter is uniquely suited for its role in managing the intersection of two roof slopes, ensuring both structural integrity and effective drainage.