roof

These screws typically have a rubber washer that creates a waterproof layer when locked in place, preventing moisture from entering the object and protecting against corrosion. They can be used to secure metal boards or roofs in damp environments, such as along the coast or on the exterior of industrial buildings.

 When installing roof screws, it is important to make sure that the screws are long enough to provide adequate holding power. 

 In addition, roof screws often require the use of a rust inhibitor to increase their durability. In particular, #12 hex head screws are required to drill through a 1.6mm metal plate within four seconds, while #14 hex head screws must drill through a 1.6mm metal plate within five seconds.