There are good reasons to choose metal roofing, including lower initial installation costs and superior protection against fire. But time catches up with everything, including metal roofs. Years of exposure to the elements, hot and cold extremes, and rust and corrosion can combine to compromise your metal roof's integrity. In fact, if your metal roof is more than a few years old, you probably know the frustration of leaky buildings and escalating maintenance costs. And you're not alone. With over 60 billion square feet of metal roofing in place in the United States and two billion more installed each year, that adds up to a lot of leaks - and a lot of money spent fighting them.

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A closer look at metal roof problems
Unfortunately, metal roofs are susceptible to a number of problems that lead to leaks and larger repair and maintenance budgets. These are some of the most common:

Loose seams and cracked penetrations
Roofs expand and contract with the weather. Because metal roofs are made of rigid sheets fastened together, this expanding and contracting loosens screws, pulls at seams, and causes cracks to form around stacks and other penetrations.

Rust and corrosion
Everyone knows what moisture does to steel. Snow, rainfall, and ponding water eventually cause rust and corrosion to form and holes to appear.

Interior Drips
Cold temperatures chill inadequately insulated metal, causing warmer moisture vapor on the building to collect as water or frost on the underside of steel roofing panels. This condensation effect can cause dripping inside, even when the weather is dry outside. And the problem is compounded when oxidation occurs and rust forms on the inside of the building.

Ice build-up
Ice build-up in gutters can block water from properly draining off the roof during a thaw, creating a drainage back-up and providing more opportunities for moisture to enter through a roof's seams.

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