Repairing Standing Seam Metal Roofing

Remove Fasteners

• Standing seam metal roofing lasts longer than other forms of metal roofing, when installed, because it is free to move and shift as it heats and cools. Many roof installers mistakenly fasten the metal in the center of the roof to keep it secure, but a standing seam system works best if only anchored at the eaves, according to the National Roofing Contractors Association. Removing some center fasteners will help stop the development of ice dams and moisture problems below the metal.

Removing Mold

• Mold and mildew develop on every roof at some point, due to the presence of abundant moisture. However, both can damage the coating that protects the standing seam metal roof from rusting or leaking. Any household detergent, containing both bleach and less than 0.5% phosphate, works best for removing mold growth recommends Best Buy Metals. Concentrations of phosphate over 0.5% or pure bleach can become corrosive to the metal roofing.

Rust

• Modern standing seam roofs feature a tough coating that usually lasts 20 years or more without failing. Older roofs of the same design lack this coating and instead feature paints or other coverings that chip and crack with age. Where the metal becomes, exposed rust develops, which leads to the failure of the roof and serious leaks. Special metal roof paints work well for sealing older standing seam roofs with rust problems, according to the National Park Service.

Seal Intrusions

• Any penetrations through the metal of the standing seam roof system must be properly sealed or the membrane and deck below will become damaged. Simply sealing holes made by fasteners or damage with construction caulk won't work. Protrusions through the roof, such as vent pipes, must be sealed around the opening with butyl copolymer tape, states the Buildings website. This tape can be used to fill in small holes as well, and the tape should be covered with a layer of polyurethane sealant.