Homeowner Guide

Why Are My Shingles Lifting or Curling?

Shingles that have started to lift at the edges, curl upward, or cup in the middle are a common sight on older roofs across South Carolina. Sometimes it's ordinary aging. Sometimes it's a sign wind has already gotten underneath the shingle and compromised the seal. Here's what's actually driving it.

What Causes Lifting and Curling

A few distinct mechanisms cause this, and they often overlap on the same roof:

• Wind-driven rain — strong wind gets under a shingle edge and, over repeated events, breaks the factory sealant strip that holds shingles flat against the roof
• Sealant strip failure with age — the adhesive strip that bonds each shingle row to the one below it loses effectiveness over time, especially on roofs approaching or past their expected service life
• Granule loss and UV exposure — sun exposure and heat cycling break down the asphalt binder in shingles over years, making them more brittle and prone to curling at the edges
• Heat cycling in humid climates — the repeated expansion and contraction between hot afternoons and cooler nights, intensified by South Carolina's humidity, accelerates wear on the shingle mat faster than in drier climates

Normal Aging vs. Storm Damage

A roof with shingles curling uniformly across large sections, especially on a roof old enough to be nearing the end of its service life, is usually showing ordinary wear — the whole roof aged together and is failing together. Lifting that's isolated to one section, especially after a specific wind event or the passage of a tropical storm remnant, points more toward storm damage than gradual aging. The distinction matters because storm damage may be covered by insurance, while age-related wear typically isn't. If you're not sure which you're looking at, or if a recent storm passed through your part of South Carolina, it's worth having someone document the roof's condition before deciding.