Hurricane-rated roofing in South Carolina: what the phrase means, what it does not, and how a Charleston roof is built to stay on

The building code South Carolina uses sets a design wind speed for every location, and it rises as you move toward the ocean. Inland towns sit in a lower band, the peninsula and the harbor towns sit higher, and the barrier islands sit at the top, so the attachment the code requires can differ between an address in Summerville and an address on the beach. The zone drives the nailing, the edge details, and often the product choice.

We don't print the design wind figure for each town, because it depends on the adopted code edition and the exact location, and a number on a web page goes stale. The figure for your address goes in the written quote once the permit jurisdiction is confirmed.

An architectural shingle can be installed with four nails or six. Four is the manufacturer's standard pattern for ordinary wind zones. Six is the high-wind pattern: two extra nails placed so each shingle is held at more points and every nail lands where the shingle is doubled by the course above it. The product doesn't change. The attachment does.

Placement matters as much as count. A nail driven too high misses the reinforced strip, too deep cuts through the mat, and at an angle tears the shingle above it. We check the crew on placement and depth; a six-nail roof with bad placement is a four-nail roof with extra holes.

Our High Wind package is built on the six-nail pattern with a TAMKO Titan XT shingle that carries the manufacturer's 160 MPH wind warranty when installed to their high-wind specification, so the nailing pattern is written into the contract.

Roofs rarely fail in the middle. They fail at the edges, where wind speeds up at the eave and the rake and the first course of shingle either holds or starts to peel. A hurricane-rated install uses a manufactured starter strip along both the eaves and the rakes, with its adhesive line at the very edge, so the first course is sealed down before wind reaches it. A regular shingle cut upside down and called a starter puts the adhesive in the wrong place.

Drip edge fastened on a tight pattern holds the edges further, and on the most exposed slopes an adhesive bead goes where the first course meets the starter. On the islands and the harbor we tighten fastener spacing at the corners.

None of this shows once the roof is finished, which is why it is where a low bid saves money. Ask any roofer to describe their starter and edge detail; if the answer is vague, the roof isn't hurricane rated.

In a strong storm, some shingles can be lost even from a well-built roof, and what happens next decides whether you have a roof repair or a gutted house. A sealed deck, also called a secondary water barrier, is a layer applied directly to the deck under the underlayment that keeps water out when the shingles above it are gone: self-adhering tape over every deck seam, or a membrane over the whole deck.

Our Peace Of Mind, High Wind, and Pearl Metal packages include full ice and water barrier at the eaves and valleys, the places most likely to take water in a storm. On island and harbor addresses we recommend extending that membrane to the full deck; ask us and we'll price it for your roof. Some carriers rate a sealed deck more favorably, and we photograph what was installed so you have something to show an agent.

The ridge and hips take direct wind and go on last, which makes them the most common piece to lose. Ridge caps on a hurricane-rated roof are a product made for the purpose rather than field shingles cut into thirds, fastened with longer nails driven through the cap and the ridge vent into the framing at the manufacturer's high-wind spacing.

Anything that stands above the roof plane can catch wind. Plumbing boots, attic fans, satellite mounts, and skylight curbs are flashed and fastened for uplift, and a loose dish or an old attic fan housing comes off before the roof goes on.

A roof needs to breathe. A Charleston attic in August is brutal without ridge and soffit ventilation, and trapped moisture shortens the life of the deck and the shingle. But every vent is an opening, and in a hurricane the rain blows sideways and up.

The fix is the right vent. Ridge vents built for high-wind zones have an external baffle and an internal filter that let air out while stopping wind-driven rain. Turbine vents, box vents, and older ridge vents without a baffle admit water in a storm, and gable-end vents facing the storm are a common source of attic water. A hurricane-rated roof pairs a tested ridge vent with open soffits and closes off the rest.

Our Peace Of Mind package and everything above it includes an upgraded ridge ventilation system, the one we spec for wind-driven rain.

It means the roof is designed and installed to resist the uplift the code expects at your address, using tested products with documented wind ratings and the attachment those ratings depend on, with the edges and the deck given the same attention as the field.

It doesn't mean the roof can't be damaged. No roof is rated for a direct hit from a major hurricane at landfall, and anyone who tells you a shingle roof is hurricane proof is selling. Debris can puncture it, a tree can fall on it, and water can come in through a window instead. The 160 MPH figure on the High Wind shingle is a product warranty under the manufacturer's conditions and makes no promise about your whole house.

What it buys is a much better chance that after a named storm you are looking at an intact roof, or a repair rather than a replacement, and a dry house.

Coastal carriers often price a policy partly on how the roof is built: the shape, the attachment, whether the deck is sealed, and how the roof ties to the walls. A wind mitigation inspection documents those features on a standard form, and a well-attached roof with a secondary water barrier may qualify for a lower premium. Whether it does, and by how much, is up to your carrier.

We won't tell you what your insurance will do, because we don't know. We install the roof so the mitigation features are real, photograph them before they're covered, and give you the documentation an inspector needs. Then ask your agent whether an inspection is worth ordering.

The state has at times run a program called SC Safe Home that helps some coastal homeowners with the cost of wind-resistance improvements. Its funding, eligibility, and open periods change. Ask us whether the program is open and whether your address qualifies; we don't promise any grant amount here.

• Have the roof inspected in spring. A loose ridge cap is a small repair in May and a large one in September.
• Clear gutters and downspouts so the water that does come has somewhere to go.
• Trim branches that overhang the roof; falling limbs cause more roof damage than wind alone.
• Photograph the roof from the ground on all sides, and the attic from inside, while it is dry.
• Know your wind or named-storm deductible, flat or percentage, and who to call to file.
• Secure or remove anything on the roof that can become a projectile, including loose satellite dishes.

• Stay off the roof. Wet shingle and a lifted deck are dangerous, and walking on storm-damaged shingle makes it worse.
• Photograph everything from the ground and the attic before anything is moved.
• If water is coming in, get a tarp on it. We inspect storm-damaged roofs within 48 hours. A documented emergency tarp is often a covered expense; keep the receipt and ask your carrier.
• Call your carrier and open the claim. You choose the contractor; you do not have to sign with the first person who knocks.
• Get the inspection in writing with photos and share it with the adjuster. We meet adjusters on site when asked.
• Do not sign a contract that assigns your claim to a roofer or promises to absorb your deductible.

Your wind deductible is your share of the claim, and it is yours to pay. A contractor who offers to waive it, absorb it, rebate it, or hide it in a padded invoice is asking the insurance company to pay for something it did not agree to, and in South Carolina that is insurance fraud with the claim in your name.

That is why no roof on this site is given away. What there is instead is a fixed written price, a scope that matches the adjuster's, and help documenting the damage so the claim reflects the real cost of a hurricane-rated replacement. If the claim does not cover all of it, you know the difference before you sign, and financing applies to that gap.