How Long Does a Roof Really Last on the Gulf Coast?

Ask a shingle manufacturer how long their product lasts and you will hear 25 to 30 years for a typical architectural shingle. Ask a roofer who has spent 39 years on Mobile and Baldwin County roofs and you will get a more honest answer: it depends on what the Gulf throws at it.

Why the Gulf Coast is hard on roofs

Heat and sun, most of the year

Asphalt shingles age by drying out. The oils in the asphalt slowly bake off, the mat gets brittle, and granules let go. Our long, intense summers run that clock faster than it runs in Ohio, which is where a lot of the textbook numbers come from. South-facing slopes with no shade age fastest of all.

Humidity and algae

Those black streaks you see on so many roofs around here are algae feeding on the limestone filler in the shingles. The streaks themselves are mostly cosmetic, but constant moisture also feeds moss and lichen, and those do hold water against the shingle and work under the edges. Nearly every shingle we install now carries algae-resistant granules for exactly this reason.

Wind, every single season

A roof does not need a named hurricane to lose its seal. Every strong squall line that rolls through lifts tabs, and once a shingle's adhesive bond breaks, it flaps in every wind after that until it tears loose. Small wind damage that never gets repaired is one of the most common reasons a 25-year roof is finished at year 15.

Salt air near the water

If you are close to the bay or the Gulf, salt accelerates corrosion on the metal parts of the roof, flashing, vents, fasteners, drip edge. The shingles may be fine while a rusted-through valley is quietly letting water in.

Realistic expectations by material

• 3-tab shingles: the budget option. Rated around 20 years, but on the coast, plan on less. We rarely recommend them here anymore.
• Architectural shingles: the standard choice. Rated 25 to 30 years; well-installed and maintained, a Gulf Coast roof in this class commonly delivers 18 to 25.
• Impact-rated and high-wind shingles: heavier mats and stronger sealant lines are worth real money in our wind zone, both in lifespan and, often, on your insurance bill.
• Metal: a properly installed metal roof commonly outlasts two shingle roofs, which is why we install more of it near the water every year.

How to get the most years out of the roof you have

1. Fix small things while they are small. A lifted shingle is a $200 visit. The rotted decking it causes two years later is a $3,000 one.
2. Keep trees cut back. Branches scrubbing granules off in every breeze will wear a stripe straight through a slope.
3. Keep gutters and valleys clear. Standing debris holds water against the roof edge, and edges are where rot starts.
4. Get it inspected after any serious storm: and once every few years regardless. Most of the expensive failures we see gave quiet warnings for years first.

Not sure where your roof is in its life? That is a fifteen-minute look for us, and the inspection is free. If it has years left, we will tell you exactly that, we repair far more roofs than we replace.

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