Rafter, Valley

Definition

A valley rafter is the rafter extending from an inside angle of the plates toward the ridge or center line of the house.

Purpose

The purpose of a valley rafter is to support the roof where two sections meet at an internal angle, forming the valley, and ensuring the stability and proper load distribution of the roof.

Examples of Use

• Valley rafters are used in roofs with intersecting planes, such as gable and hip roofs, to provide support where the valleys occur.
• In dormer roof designs, valley rafters extend from the intersection of the dormer roof with the main roof to the ridge.
• Valley rafters are essential in complex roof designs to maintain structural integrity and effective water drainage.

Related Terms

• Valley: The internal angle formed by the intersection of two sloping roof planes.
• Ridge: The horizontal line at the top of the roof where the rafters meet.
• Jack Rafter: A rafter that fills the space between the valley rafter and the top of the wall plate.

Notes

Valley rafters must be installed accurately to ensure the roof's stability and proper water drainage, preventing leaks and structural issues.