What is the term for deflection of the ridge beam?

The term for deflection of the ridge beam is "swayback or saddleback." This term refers specifically to the bending of a ridge beam, typically observed where the center of the beam dips lower than the ends, creating a concave appearance. This condition can occur due to various factors, including excessive loads, improper construction, or the aging of materials, which lead to structural deformities.

Understanding this terminology is crucial for roof inspection and maintenance, as swayback or saddleback not only indicates structural integrity issues but can also affect the overall performance of the roofing system, potentially leading to water pooling and further damage. Identifying this type of deflection helps inspectors to inform homeowners about potential repairs needed to maintain the safety and efficiency of the structure. Other terms like buckling, bow, or warp, and twist or bend describe different forms of deformation and do not specifically characterize the particular deflection of the ridge beam as swayback does.