Metal roofs are renowned for their strength, durability and performance, but they can still be prone to leaking. Here are five of the most common reasons why metal roofs may leak, even when they have been properly installed. The most frequent cause of leaks in metal roofs is due to roofing screws. These screws are responsible for creating a “joint” between the panel and the screw head by compressing a rubber grommet at the base of the screw head.
If the screws are inserted incorrectly, such as being driven at an incorrect angle or not being driven far enough, then water can enter through these joints. Another area where metal roofs are more likely to leak is around chimney plugs. These plugs have a lifespan of less than half that of the roof itself, and when they fail, they need to be replaced by a qualified roofing expert. Pile gaskets, also known as “boots” or gaskets, surround pipes that protrude from the metal roof.
The constant expansion and contraction of the metal roof due to heat puts a lot of pressure on these gaskets over time, which can lead to leaks. Rust can also be a problem for metal roofs as it can destroy the protective layer of the roof and leave holes or inlays that can cause leaks. Finally, if metal roofs are not properly installed then the joints along the metal panels can lift and allow water to drip from under the ceiling. This problem is impossible to solve without scraping off the metal panels and starting from scratch. Metal roofing products can be made from a variety of metals such as galvanized steel, copper, aluminum or tin and can use a number of different installation systems.
It is important to ensure that these systems are installed correctly in order to prevent any potential leaks.