Final answer:
Common rafters are the type of rafters that extend from the top plate to the ridge board at a 90° angle to both.
Step-by-step explanation:
In construction, the type of rafters that extend from the top plate to the ridge board at a 90° angle to both are called 'common rafters'Common rafters are the most basic and commonly used type of roof rafter. They form the framework of the roof and provide support for the roof covering, such as shingles or tiles.
Common rafters are typically evenly spaced along the length of the roof and are cut to the same length so that they meet at the ridge board and the top plate at a 90° angle.In construction, the kind of rafters that extend from the top plate to the ridge board at 90° to both are commonly known as common rafters. These rafters run perpendicular to the walls and meet at the apex of the roof, directly connecting to the ridge board, which runs along the peak of the roof. Common rafters are an essential component in traditional roof framing and are cut to meet the specific pitch or slope of a roof. They are responsible for supporting the sheathing and roofing materials, and they also define the shape and silhouette of the roof.
Learn more about Common Rafters