7 Signs Your Summerville Roof Is Failing read the roof before it reads you a bill.

Every asphalt shingle sheds some granules over its life — that's normal, especially in the first year or two after installation. What's not normal is a heavy, ongoing accumulation of granules collecting in gutters, at the base of downspouts, or forming a visible grit pattern in the driveway after rain. Granules are the protective ceramic coating that shields the asphalt beneath from UV degradation; once a shingle has lost a meaningful portion of its granule layer, the exposed asphalt ages far faster than the rest of the roof.

In Summerville specifically, heavy granule loss often correlates with algae staining — the Gloeocapsa magma colonies common on shaded slopes weaken the bond between granules and asphalt over years, and the north- or east-facing slope on a given house frequently shows heavier granule loss than the sunnier slopes on the same roof.

Shingles that have lost flexibility curl at the edges (curling), cup in the middle (cupping), or show a combination pattern sometimes called clawing. All three indicate the asphalt has dried out and lost the pliability it needs to lie flat and shed water properly. In our sustained summer heat, this happens faster than it would in a milder climate — repeated daily heat cycling is one of the primary mechanisms that ages asphalt shingles.

Curled or cupped shingles create small gaps where wind can catch the edge and lift it further, which is why a roof showing widespread curling is also a roof more vulnerable to wind damage in the next summer storm — the two problems compound rather than existing independently.

This is one of the more serious signs on this list and the easiest to check yourself safely. On a sunny day, go into the attic (with a flashlight even though you're checking for light) and look up at the underside of the roof deck. Any pinpoints of visible daylight mean there's a gap somewhere in the roofing system large enough to let light through — which means it's also large enough to let water through during the next rain.

This check takes ten minutes and catches problems that aren't yet visible from the ground or even from a casual walk on the roof itself. If you see daylight, that's worth a same-week inspection rather than something to note and revisit later.

A properly ventilated, properly sealed roof system keeps the attic reasonably dry even in Lowcountry humidity. An attic that feels noticeably damp, smells musty, or shows any visible mold or mildew growth on the underside of the deck or on stored items is telling you that moisture is getting in and not drying out — whether from a small roof leak, condensation from poor ventilation, or both.

This sign is easy to miss because most homeowners don't go into the attic regularly. It's worth a periodic check, especially heading into and coming out of summer, when the temperature and humidity differential between attic and outside air is at its most extreme and any ventilation problems are most likely to show symptoms.

Flashing — the metal strips sealing the joints where the roof meets a chimney, vent pipe, skylight, or wall — is one of the most common failure points on an otherwise sound roof, because it's a smaller, more concentrated seal than the broad shingle field around it. Cracked pipe boots (the rubber or plastic collar sealing around vent pipes) are especially common in our climate, since UV exposure and heat cycling degrade the rubber faster here than in milder regions.

A quick visual check from the ground with binoculars, focused specifically on flashing around any roof penetration, catches a large share of leaks before they start — these are also some of the cheapest problems to fix while they're still isolated, compared to the water damage that follows if they're ignored.

A roofline that visibly sags between rafters, or a spot that feels soft or spongy when a roofer walks it, points to structural moisture damage in the decking beneath the shingles — typically the result of a leak that's been active long enough to saturate and weaken the plywood sheathing. This is the sign that most reliably indicates the problem has moved past a simple shingle repair and into deck replacement territory, at minimum for the affected section.

Sagging is rarely sudden — it develops gradually as an unaddressed leak does its work over months or years, which is exactly why the earlier signs on this list matter: catching granule loss or a cracked pipe boot early is what prevents the roof from ever reaching this stage.

A roof approaching or past its realistic service life — roughly 20-25 years for architectural shingle in our climate — that has also weathered one or more significant wind events, like the June 10, 2024 storm that brought 80-85 mph gusts across Summerville and Ladson, deserves a closer look even if nothing looks obviously wrong from the ground. Wind can break a shingle's seal strip without visibly displacing it; the shingle looks intact but has effectively lost its wind resistance and will fail in a weaker storm than it originally would have.

This is the sign that's easiest to overlook precisely because there's nothing to see. A roof's age combined with a known storm history is enough reason on its own to schedule an inspection, even absent any of the other six signs.