Roofing felt is a popular choice for garage roofs, offering a cost-effective solution that protects against the elements. However, one of the key considerations when using roofing felt is its lifespan. How long can you expect it to last, and what factors influence its durability? In this article, we will explore the typical lifespan of roofing felt on a garage roof, how to maintain it, and signs that it may need replacing.
What Is Roofing Felt?
Roofing felt, also known as bitumen felt or tar paper, is a material made from a combination of natural or synthetic fibers soaked in bitumen (asphalt). It comes in rolls and is applied in layers to create a waterproof barrier on roofs, including those of garages, sheds, and outbuildings. It acts as a secondary protection layer underneath other roofing materials, helping to keep moisture out and preventing leaks.
Typical Lifespan of Roofing Felt
The lifespan of roofing felt on a garage roof depends on various factors, including the quality of the material, the installation process, and the local climate. On average, roofing felt can last between 5 to 15 years. Here’s a breakdown of what influences this range:
1. Quality of the Roofing Felt:
- Standard Roofing Felt: Standard roofing felt, often used for garden sheds and smaller garages, has a lifespan of 5 to 10 years. This type of felt is more budget-friendly but may require more frequent replacement.
- High-Performance Felt: High-performance or modified bitumen felt offers improved durability and weather resistance. This type can last up to 15 years or more, making it a better choice for those looking for a longer-lasting solution.
- Underlay Felt: Used beneath other materials like shingles or tiles, underlay felt is not directly exposed to the elements, allowing it to last closer to 20 years when used in combination with a protective outer layer.
2. Installation Quality:
- Proper installation plays a significant role in the longevity of roofing felt. If the felt is laid correctly, with proper overlapping and securely fixed to the roof, it is more likely to last closer to the upper end of its lifespan.
- Incorrect installation, such as insufficient overlap between felt layers or poorly secured edges, can lead to premature wear and tear, allowing water to seep underneath and reducing the felt’s effectiveness.
3. Climate and Environmental Factors:
- Sun Exposure: Prolonged exposure to direct sunlight can cause the bitumen in roofing felt to dry out, making it more brittle and prone to cracking. In regions with intense UV exposure, the lifespan of felt may be shorter.
- Rainfall and Humidity: High levels of moisture, whether from heavy rainfall or humidity, can affect roofing felt over time. If water seeps under the felt and is not able to dry out, it can cause rotting or mold growth underneath, leading to deterioration.
- Wind and Storms: Areas prone to strong winds and storms may see more rapid wear on roofing felt, especially along the edges where wind can lift the material, leading to tearing or peeling.
How to Extend the Lifespan of Roofing Felt
To maximize the life of roofing felt on your garage roof, regular maintenance is essential. Here are some tips to help extend its lifespan:
1. Regular Inspections:
- Conduct regular inspections of your garage roof, especially after severe weather conditions. Look for any signs of tears, bubbles, or areas where the felt may have lifted.
- Pay special attention to the edges and overlaps, as these are common places where damage can occur.
2. Prompt Repairs:
- If you notice any minor damage, such as small rips or areas where the felt has begun to lift, repair them promptly. Using roofing adhesive or patch kits can help seal minor issues before they become bigger problems.
- For larger areas of damage, consider hiring a professional to ensure the repair is done correctly.
3. Keep Gutters Clean:
- Clogged gutters can lead to water pooling on the roof, which can accelerate wear and tear on roofing felt. Make sure to clean out gutters regularly to prevent water buildup.
- Consider installing gutter guards to reduce the need for frequent cleaning and ensure proper drainage from your garage roof.
4. Apply a Protective Coating:
- Applying a roof sealant or coating can provide an additional layer of protection against UV rays and moisture. These coatings can extend the life of roofing felt by reducing the effects of sun exposure and water penetration.
- Coatings should be applied according to manufacturer instructions and may need to be reapplied every few years for maximum effectiveness.
Signs That Your Roofing Felt Needs Replacing
Even with proper maintenance, roofing felt will eventually reach the end of its useful life. Here are some signs that it may be time to replace the roofing felt on your garage roof:
- Visible Cracks or Tears: If you notice visible cracks, rips, or splits in the roofing felt, it may no longer provide adequate waterproofing.
- Water Leaks: A clear sign of worn roofing felt is water leaking into the garage. If you notice damp patches on the ceiling or walls, it may be time for a replacement.
- Blistering or Bubbling: Blistering or bubbles under the felt often indicate that moisture has become trapped underneath. This can compromise the integrity of the felt and may require repair or replacement.
- Felt Lifting or Curling: When the edges or seams of the felt start to lift or curl, it can create an entry point for water. This often signals that the adhesive has failed or that the felt is drying out.
When to Consider Upgrading
If your roofing felt is approaching the end of its lifespan, you may also want to consider upgrading to a more durable material. Alternatives such as EPDM rubber roofing, fibre cement sheets, or metal roofing can offer longer lifespans and require less maintenance over time. While the initial cost may be higher, these materials can provide better long-term value for a garage roof that needs to endure harsh weather conditions.
Conclusion
The lifespan of roofing felt on a garage roof generally ranges from 5 to 15 years, depending on the quality of the felt, installation, and environmental conditions. By performing regular maintenance and addressing minor issues as they arise, you can help extend the life of your roofing felt and ensure that your garage remains well-protected. If you notice signs of wear, it’s important to take action promptly to prevent further damage to your roof. And when the time comes, consider your options carefully to find the best roofing solution for your needs.
