When you live in a hot, humid, coastal climate like Myrtle Beach, your roof is exposed to some harsh environmental conditions.
Over time, heat, humidity, and salt air can take a serious toll on roofing materials, shortening their lifespan and increasing the need for maintenance.
In our 40 years of business, we’ve seen the effects of heat, humidity, and salt air on a roof. And it’s not pretty.
Understanding how each of these factors affects your roof can help you make smarter decisions about care, materials, and long-term upkeep.
The Impact of Heat and UV Rays on Roofing Materials
The combination of heat and UV rays is one of the most relentless stressors your roof will face.
- Rubber grommets on exposed fastener metal roofs
are especially vulnerable. Prolonged sun exposure causes the rubber to dry out and crack, compromising the watertight seal around fasteners. - Asphalt shingle roofs can also dry out more quickly in hotter climates. When shingles lose their flexibility, they become brittle, making them more prone to cracking, curling, and losing granules. When your shingles are compromised in this way, they’re susceptible to wind damage. Damage of this nature, when left for a period of time, can cause roof leaks.
- Caulking and roof sealants degrade faster under UV exposure, which is why resealing every 3–5 years is recommended to maintain their effectiveness. Caulking and roof sealants are used on things like exposed nail heads that can rust and disintegrate when exposed to the elements over time, leaving a hole in your roof for water to come in during rainfall.
- Steel roofs are not immune either. Over time, heat and sun exposure can contribute to corrosion, especially if the protective paint layer begins to deteriorate. Not only that, but you run the risk of oil canning, which doesn’t negatively affect your roof’s functionality, but can be aesthetically displeasing.
To learn about oil canning, check out this article: What is Oil Canning on a Metal Roof? (And How to Prevent it)
The Impact of Humidity on Roofing Materials
Humidity brings its own set of challenges, particularly when it comes to the growth of algae and mildew.
- Algae and mildew buildup tends to occur more on the northernmost side of your roof. That’s where morning dew lingers the longest. The combination of lingering moisture and warm, humid afternoons creates an ideal environment for organic growth.
To learn how to remove algae from your roof, take a look at this article where we offer DIY and professional options for algae removal: How to Get Rid of Algae on Roof Shingles | Myrtle Beach
Fortunately, this type of buildup is largely cosmetic. While it can make a roof look stained or dirty, it generally doesn’t affect the lifespan or performance of the shingles themselves. Many homeowners choose to address it simply for curb appeal.
- Ventilation plays a role here, too. In areas with consistently high humidity, poor attic ventilation can trap moisture and exacerbate mildew or humidity-related issues. Proper ventilation can help regulate attic conditions and reduce the risk of moisture problems. When you don’t have adequate ventilation on your roof, you can run into issues like this, or worse.
If you’re concerned you might not have the best ventilation system on your roof, check out: The Importance of Proper Attic Ventilation for Your Roof to see why proper ventilation is worth investing in.
The Impact of Salt Air on Roofing Materials
If you live near the ocean, salt air is an unavoidable factor. And it can be particularly tough on roofing materials. Often homes on the beach or the Intracoastal Waterway don’t last as long as inland or tree-covered roofs.
- Steel roofs are especially susceptible to corrosion in salty environments. Unless you’re using standing seam aluminum, most fasteners won’t be stainless steel, which accelerates rusting over time. Maintenance is crucial throughout the life of an exposed fastener metal roof to avoid costly repairs, especially if your home is located near a body of salt water. We suggest having fasteners replaced around the 10 year mark to avoid damage.
- Roofing nails are another weak point.
Some homeowners have experienced hundreds of rusted nails on their roofs due to prolonged salt air exposure. Corroded nails can lead to leaks and require expensive resealing or, ultimately, a roof replacement.
We recently completed an inspection for a homeowner who did not have obvious signs of roof damage, like missing shingles. But she had roof leaks. Upon inspection, it was clear that the nails holding the shingles to the roof had rusted, resulting in interior leaks.
- Salt air can also shorten the lifespan of asphalt shingles. Oceanfront homes typically see shingle roofs lasting closer to 16–18 years, compared to longer lifespans inland. The combination of salt, wind, and sun creates a harsher environment that accelerates deterioration.
How to Maintain Your Roof in Hot, Humid Conditions
While you can’t control the climate, you can control how well you care for your roof. A proactive maintenance strategy can go a long way.
- Routine maintenance is the single most effective way to extend your roof’s life. Clearing debris, resealing vulnerable areas, and inspecting for corrosion can prevent minor issues from becoming major repairs.
- Consider upgrading materials. If your budget allows, aluminum or tile roofing can offer significantly better resistance to heat, humidity, and salt air than standard asphalt shingles or steel. While the upfront cost is higher, these materials often last longer and require less frequent maintenance.
- Follow your roofer’s ventilation recommendations. Proper ventilation won’t make your attic cooler than the outside temperature, but it will help manage moisture levels and prevent humidity-related issues from worsening. For homeowners deeply concerned about heat, investing in spray foam insulation is another option for improving indoor comfort and energy efficiency.
FAQs About Roof Damage Due to Coastal Climates
What kind of roof materials perform best in coastal climates?
The best materials for coastal roofs are either metal or architectural shingles. A metal roof is a top performer because it can be coated with a coastal-grade paint/finish to help it resist corrosion. With proper installation and maintenance, a metal roof can last 40-70 years on a coastal home. An architectural shingle roof, when installed properly, can perform well if you keep up with roof maintenance.
Some homeowners opt for SC Safe Home and FORTFIED roof grants. With these grants, you can get a new roof that is engineered to resist coastal conditions.
If you think a roof grant could be helpful to you, you may be interested in reading a bit more about them: SC Safe Home and Fortified Roof Grants Explained
Has Your Roof Been Impacted By Heat, Humidity, or Salt Air?
Heat, humidity, and salt air are powerful forces that can wear down your roof over time. From UV degradation to rusted fasteners and mildew buildup, the coastal climate demands more attentive roof care than other regions.
By understanding these long-term impacts and taking a proactive approach to maintenance and material choices, you can help ensure your roof stands strong against the elements for years to come.
And if you have questions about suspected damage on your roof, give us a call. We’re happy to come out to inspect and document any damage that may have occurred over the years.
