Final answer:
The sections of lumber located directly under the roof decking are called rafters. They provide structural support to the roof and transfer the weight of the roof to the walls.
Step-by-step explanation:
The sections of lumber located directly under the roof decking are called rafters. They provide structural support to the roof and transfer the weight of the roof to the walls. In a pitched roof, the rafters extend from the ridge line to each side wall, while in a flat roof, they extend from wall to wall.
Learn more about Roof Rafters