Metal roofing materials are much more durable than their wooden and asphalt counterparts, but just like every other exterior surface of your home, they are exposed to a massive amount of different weather conditions which can cause them to begin to degrade over time. Damaged roofing panels can cause water damage within your home that can lead to mold growth and expensive repairs. While companies like The Roof Doctor can offer more information, below are the warning signs of worn and aging metal roofing to help you catch damage early.
The most obvious sign that you may need to patch or replace individual sections of your home's roof is if there are actual holes or other forms of physical damage that puncture through the surface of your roof. Large holes will be the most noticeable, and will usually be caused by falling debris which has punched clear through your metal paneling. Keep in mind that other types of holes can manifest themselves as well, however: missing fasteners and screws, poor installation, and expansion and contraction due to temperature fluctuations can all create openings on your roof that can allow water to enter your home.
While most metal roofing panels and shingles are treated with rust-resisting chemicals that prevent the spread of corrosion throughout your roof, eventually water exposure and general wear will cause rust to take root. Rust can quickly spread throughout your entire panel, eating away at the structural integrity of your roofing materials and creating holes, as mentioned above, that allow water to enter your home where it can cause all sorts of damage. Small amounts of rust may be able to be sanded off and then painted over to protect your roof; however, widespread and deep-set sections of rust will require the replacement of entire panels or even sections of your metal roof.
Despite what their name would suggest, blow-offs are not entire panels that have been removed from your roof due to heavy winds. Instead, blow-offs are much more subtle and harder to notice. They are small gaps at the lip of individual metal roofing panels that form during heavy high winds, but which may bend back into place once the wind dies down. Blow-offs will eventually bend your metal roofing panels out of shape and create an opening for water and moisture, as well as pests, to enter your home, and can stress the structure of your roofing materials to the point where breaking and damage are likely occurences.