If you have ever looked up at a roof and noticed the edges of the shingles curling or lifting, you are not alone. Curling shingles are a common roofing problem for residential properties across the Lower Mainland and the Fraser Valley. While this issue might seem minor at first glance, it can lead to significant damage if not addressed quickly. Understanding the causes and fixes for curling shingles can help extend the life of a roof and protect the entire home from weather-related damage.
At Ridge Meadows Roofing, we have seen firsthand how the local climate and improper installation practices can lead to curling shingles. Fortunately, with the right materials, expertise, and timely repairs, this issue is both manageable and preventable.
What are Curling Shingles?
Shingle curling refers to the visible warping of a roofing shingle, typically when the edges begin to turn upward or downward, detaching from the flat plane of the roof. This deformation can affect both the appearance and the function of a roof, leaving gaps that let in moisture, wind, and even pests.
There are two primary types of curling, and both can compromise the roof’s ability to shed water and resist weathering:
- Cupping: When the edges of the shingles curl upward.
- Clawing: When the centre of the shingle rises while the edges remain flat.
Common Causes of Curling Shingles
Curling shingles are rarely caused by one single issue. Often, it is a combination of environmental exposure, installation mistakes, and aging materials. Below are the most common causes.
1. The Age of the Roof
Like most building materials, shingles have a lifespan. Over time, the binding oils in asphalt shingles dry out, causing the shingles to shrink and curl. As fibreglass laminated shingles age, they lose their ability to lie flat, especially in the damp, coastal climate of BC.
2. Poor Attic Ventilation
Inadequate attic ventilation is one of the leading causes of premature roof deterioration. Without proper airflow, heat and moisture build-up beneath the roof deck, creating an environment that accelerates shingle warping and weakening. This is particularly important in regions with cold, wet winters and warm summers.
3. Improper Installation
If shingles are not properly nailed, or if the underlayment was not correctly applied, it leaves the roofing material vulnerable to movement and curling. Shingles that are fastened too high, too low, or with insufficient nails may loosen over time.
4. Low-Quality Materials
Not all shingles are created equal. Cheaper roofing materials may be more susceptible to moisture absorption, temperature fluctuations, and UV damage, all of which can contribute to curling. Opting for premium-grade materials from trusted manufacturers can make a significant difference in longevity and performance.
5. Weather and Climate
BC’s climate is hard on roofs. The combination of heavy rainfall, high humidity, and temperature swings can wear down shingles faster than in drier or more temperate regions. Freeze-thaw cycles, in particular, can cause shingles to expand and contract repeatedly, eventually leading to deformation.
6. Multiple Roofing Layers
In some cases, homeowners may have new shingles installed over old ones. While this may seem like a cost-saving measure, it can actually accelerate curling by preventing proper adhesion and ventilation between layers.
Why Curling Shingles Should Not Be Ignored
While curling shingles might appear to be a cosmetic issue at first, they pose several serious risks:
- Water intrusion: Curling allows rainwater to seep beneath the shingles, leading to leaks, rot, and potential mould growth in the attic or ceilings.
- Wind damage: Shingles that curl are easier for strong winds to lift and rip off entirely.
- Ice dams: In winter, water can back up under curled shingles and freeze, creating damaging ice dams.
- Reduced lifespan: A compromised roofing system will require earlier replacement, increasing long-term maintenance costs.
Fixes for Curling Shingles
A regular roof inspection can identify curling early and help homeowners avoid extensive and expensive damage. The best solution depends on the extent of the curling and the overall condition of the roof.
1. Spot Repairs
If the curling is isolated to a few shingles and the rest of the roof is in good shape, a small repair may be all that is needed. This involves:
- Removing the affected shingles
- Replacing them with matching fibreglass laminated shingles
- Resealing the area to ensure watertight protection
2. Roof Overlay (Not Recommended)
Some contractors offer to install a new layer of shingles over the existing roof. While this may mask the problem temporarily, it rarely addresses the root causes and can lead to additional issues later.
3. Full Roof Replacement
If curling is widespread or accompanied by other signs of failure (like granule loss, sagging, or persistent leaks), a full roof replacement is the most reliable long-term fix.
4. Improve Ventilation
If poor attic ventilation is contributing to curling, correcting it is essential. Solutions may include installing additional soffit or ridge vents, adding attic fans, and ensuring insulation does not block existing airflow. Proper ventilation helps extend the life of both your shingles and the structural components beneath them.
5. Schedule Regular Roof Inspections
The best way to catch curling shingles early is with regular roof inspections. A professional roofing contractor can identify weak points, spot potential issues before they worsen, and recommend cost-effective solutions.
Leave the Shingles Fixes to the Pros
Curling shingles can compromise both the function and appearance of a roof, but they do not have to spell disaster. Whether it is caused by aging, poor ventilation, or installation errors, curling can be repaired or prevented with the right approach.
At Ridge Meadows Roofing, we bring years of experience and craftsmanship to every project, helping homeowners in the Lower Mainland and Fraser Valley protect their investments with high-quality, long-lasting roofing solutions. If you have noticed curling shingles or want a professional inspection, contact Ridge Meadows Roofing today. Our team is ready to assess, repair, or upgrade your roof with confidence and care.
