There are different types of roofing options in the market. There is asphalt shingles, clay tiles, slate shingles, green roof, etc. However, if there is a roofing option that lasts longer, requires little maintenance, stands up to all weather conditions, and cuts down energy costs, it is the metal roof. But, all these qualities do not make metal roofs indestructible. These roofs can leak too. In this blog, we will take a look at common reasons why properly installed metal roofs can leak. Let’s get started!
Screws Driven In The Metal Roof
You will be surprised to know that most leaks in metal roofs are caused by roofing screws. The job of the screws is to form a seal so that water stays out. It achieves this by pressing a rubber washer present at the base of the screw head. A sort of gasket gets formed between the roofing panel and the screw head when a screw is driven into the metal roof panel. Properly driven screws form a proper gasket but under driving screws, driving screws at an incorrect angle, overdriving screws, or screws that miss the framing member, all allow water to penetrate through the metal roof.
Stack Flashings
Many commercial metal roofs leak through the stack flashings, which are basically flashings around the pipes that go through the metal roof. Many things go through your metal roof such as plumbing pipes, HVAC vents, air vents, etc. The job of the stack flashings is to waterproof the pipe by creating a seal using its rubberized material. These flashings form a double seal. One is formed by staying flat on the metal roof surface and another one is formed by squeezing the pipe from all sides. Although these seals are strong, constant expansion and contraction of the metal roof make them weaker over time. Also, the rubberized material degrades over time under direct sunlight. You should replace old stack flashings to keep your building dry.
Worn Out Sealants
It has been found that metal roof sealants that are installed together with the metal roof do not hold out as long as metal roofing panels do. They need to be changed with regular roof maintenance. You need to fill up sealants around areas such as roof transitions, metal ridge caps, counter flashings, Z flashings, pitch pans, etc., as they all wear with time. It is therefore essential to use only sealants that are specifically made for metal roofs. As we all know, metal roofs expand and contract. If you want sealants to last longer and offer protection against water penetration, you must only use sealants that are flexible and can stretch with the metal without breaking their seal.
So, there you have it. These are some of the most common causes of leaks in metal roofs. You can get in touch with a reputable metal building contractor like the Metal Guard for getting your metal roof inspected for leaks and their possible causes. Proper metal roof sealing is essential for keeping water out of your building. With the help of an experienced metal building contractor, you will be able to seal your metal roof in the correct way.