Roof tiles are designed to sit securely and protect your home from the elements. However, as a roof ages, it is common to see an increase in tile movement. Slipped, misaligned or loose tiles are often a sign that the roofing system has gradually weakened over time.
For homeowners in Oxted, Surrey, understanding why this happens can help prevent minor movement from developing into more serious issues.
At Oxted Roofing Repairs, we regularly inspect older roofs and address the causes of tile displacement before they lead to water ingress or structural concerns.
Natural Ageing of Fixings
One of the primary reasons for tile movement is the deterioration of fixings.
Nail Corrosion
Many older roofs rely on nails to secure tiles to timber battens. Over time, these metal fixings can corrode due to moisture exposure within the roof space. As corrosion weakens the nails, tiles lose their secure hold and may begin to slip.
This process is gradual, meaning tile movement often increases as the roof reaches a later stage of its lifespan.
Clip Fatigue
Where tile clips have been used, repeated wind pressure and temperature changes can cause them to weaken or loosen over time.
Timber Batten Deterioration
Tiles are supported by timber battens fixed to the rafters. If these battens begin to deteriorate, they may no longer provide stable support.
Moisture Exposure
Persistent moisture within the roof space can cause battens to soften or decay. Even slight weakening can affect the alignment of tiles, allowing them to shift under pressure.
In Oxted, Surrey, where roofs are exposed to seasonal weather variation, maintaining dry and well-ventilated roof spaces is essential to preserving batten strength.
Repeated Thermal Expansion and Contraction
Roofing materials naturally expand and contract with temperature changes.
Long-Term Movement
Over decades, repeated expansion and contraction can gradually loosen tiles from their original position. While modern systems are designed to accommodate this movement more effectively, older roofs may not have been installed with the same level of mechanical fixing.
As materials shift microscopically over time, the cumulative effect can result in visible displacement.
Wind Uplift Over Time
Wind pressure plays a significant role in tile movement.
Gradual Loss of Resistance
Strong winds exert upward pressure on tiles. When fixings weaken due to age, tiles become more vulnerable to uplift. Even moderate weather conditions can dislodge tiles that are no longer securely fastened.
This is particularly common in older roofs where original fixing methods may not meet modern standards.
Mortar Deterioration at Ridge and Verge
Many older roofs rely on mortar to secure ridge tiles and verge details.
Cracking and Erosion
As mortar ages, it can crack and crumble. Once this protective support weakens, ridge tiles may become unstable, increasing the likelihood of movement elsewhere on the roof.
Dry ridge and dry verge systems used in more modern installations are less reliant on mortar, reducing this risk.
The Importance of Early Attention
Tile movement should not be ignored. Even small shifts can create gaps that allow water to penetrate beneath the roof covering.
Professional inspection can determine whether:
- Fixings require replacement
- Battens need reinforcement
- Ridge or verge systems should be upgraded
- A more comprehensive repair is advisable
Addressing movement early prevents further displacement and protects the underlying structure.
Conclusion
Older roofs experience more tile movement due to ageing fixings, batten deterioration, thermal expansion, wind exposure and mortar breakdown. These factors develop gradually but can lead to noticeable instability over time.
For homeowners in Oxted, Surrey, regular inspection and timely repair are essential to maintaining a secure roofing system. Oxted Roofing Repairs provides professional assessments and expert repair services designed to stabilise ageing roofs and prevent further tile displacement. Contact our team to ensure your roof remains safe, secure and weather-resistant.
Call us on: 01883 770 791
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