What Causes Roof Shingles to Curl and Crack?
Roof shingles are designed to protect your home from the elements, but over time, even the most durable materials can begin to show signs of wear. One of the most common problems homeowners face is curling or cracking shingles—issues that can compromise both the appearance and function of a roof. At LPO Roofing Kempston in Kempston, Bedfordshire, we regularly assess and repair roofs affected by this issue and help clients understand what’s causing the damage and how to address it properly.
Common Causes of Curling and Cracking in Roof Shingles
Shingles can curl or crack due to a range of factors, many of which are linked to age, weather conditions, or installation errors. Understanding the root cause is the first step to protecting your roof from further deterioration.
1. Ageing and Weathering
As shingles age, they naturally lose flexibility and begin to deteriorate. Prolonged exposure to sunlight, temperature changes, wind, and rain will eventually cause them to shrink, dry out, and become brittle. This process often results in visible curling at the edges and surface cracking.
- Curling: Usually starts at the edges and can lift upwards or downwards
- Cracking: Appears as splits or fractures across the surface, weakening the shingle
If your roof is over 15-20 years old, age-related damage is likely the main culprit.
2. Poor Ventilation in the Loft Space
Proper attic or loft ventilation is essential for regulating temperature and moisture. If your roof space traps heat or condensation, it can accelerate the breakdown of shingles from underneath. This trapped moisture causes the decking to warp and the shingles above to curl or crack prematurely.
Signs of ventilation issues may also include damp insulation or mould growth in the loft.
3. Improper Installation
Even the best quality shingles can fail early if they weren’t installed correctly. Common installation issues include:
- Inadequate nailing or incorrect spacing
- Misaligned rows or poor sealing
- Skipping underlayment or failing to prepare the roof deck properly
Poor installation can cause shingles to lift, lose adhesion, and eventually curl or crack well before the end of their expected lifespan.
4. Water Infiltration and Rot
Water that seeps beneath the shingles—often through damaged flashing or clogged gutters—can saturate the roof deck and cause structural weakening. This hidden damage causes shingles to warp from below, resulting in curling, particularly at the corners.
Once water infiltration has begun, the damage can spread quickly and may also affect nearby timber, insulation, and internal ceilings.
5. Manufacturing Defects
Though less common, some shingles fail early due to manufacturing flaws. If your roof is relatively new and has started showing signs of curling or cracking, it may be due to defective materials.
In these cases, warranties may apply, but a professional assessment is required to confirm the issue.
Why You Shouldn’t Ignore Curling or Cracked Shingles
While a few curled or cracked shingles may seem like a minor cosmetic issue, they can allow water to enter the roof structure, leading to far more serious and costly damage over time. Left unaddressed, you may face problems such as:
- Internal leaks and damp patches
- Mould and mildew in roof voids
- Structural timber rot
- Reduced insulation performance
Addressing the issue early can help you avoid full roof replacement and protect your home’s value.
How We Can Help
At LPO Roofing Kempston, we carry out thorough inspections to identify the cause of shingle curling or cracking and recommend the most suitable repair. Depending on the extent of the damage, we may:
- Replace isolated damaged shingles
- Reinforce or upgrade roof ventilation
- Seal problem areas to prevent water ingress
- Provide honest advice on whether partial or full re-roofing is the better long-term option
Our team uses high-quality materials and proven methods to ensure repairs are durable, weather-resistant, and in keeping with your property’s style.
Conclusion
Curling and cracking roof shingles are clear signs that your roof needs attention. Whether caused by age, poor ventilation, water damage, or faulty installation, these issues can lead to more serious problems if ignored. At LPO Roofing Kempston in Kempston, Bedfordshire, we offer professional, reliable solutions to restore your roof’s performance and protect your home for the long term.
If you’ve noticed signs of curling or cracked shingles on your roof, contact us today to arrange a professional inspection. We’re here to help you maintain a strong, secure, and weatherproof roof all year round.
Call us on: 01234 676 690
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