Rust, Warping

Rust, Warping of Roof Decking, and Deterioration of Roof System

In a moist environment, rust can form on metal components like nails and fasteners, which can eventually weaken and fail. Warped roof decking can occur after excessive moisture seeps into the roof decking and dissolves the adhesives that hold them together. The decking warps or sags between the rafters. Deterioration of the roof system, including the underlayment and shingles can be caused by excessive heat and moisture not being vented out of the attic.