Felt shingles, often sold as roofing felt or underlayment, are commonly used in conjunction with traditional shingles to provide a moisture barrier and insulation. This guide explains what felt shingles are, the options you’ll find at B&Q, how they compare to US equivalents, and practical advice for selection, installation, and maintenance. It highlights how to choose products that balance protection, cost, and ease of use in home roofing projects.
What Are Felt Shingles
Felt shingles refer to a layer of continuous material installed on roof decks beneath visible roofing materials. They come in two main types: traditional asphalt-impregnated felt and modern synthetic underlayments. Traditional felt is a fibrous sheet that provides weather resistance and a temporary barrier during installation. Synthetic underlayments, made from polymer-based fabrics, offer greater strength, tear resistance, and lighter weight. Both serve to protect the roof deck from moisture and to improve roof longevity when used correctly.
Types And Materials
At B&Q, homeowners typically encounter these options:
- Roofing Felt (Asphalt-Saturated): A budget-friendly, easy-to-handle option suitable for many traditional roof setups. Provides basic moisture protection but can be heavier and slower to install.
- Synthetic Roofing Underlayments: Lightweight, durable, and resistant to tearing. Ideal for steeper pitches or areas with harsh weather. Often offers better performance in cold temperatures and higher resistance to UV exposure.
- Tapes And Fasteners: Special tapes and fasteners designed to seal joints and seams for enhanced waterproofing, especially in roof valleys and edges.
Choosing between felt types involves considering weather conditions, roof pitch, local building codes, and the desired lifespan. In general, synthetic underlayments provide superior performance and longer life, but asphalt felt remains a cost-effective option for many projects.
Why Use Felt Shingles In Roofing
Felt shingles protect the roof deck during construction and improve long-term performance by preventing moisture intrusion. They act as a secondary barrier against wind-driven rain and help reduce heat transfer into the attic space. For reroofing projects, the underlayment can also aid in slip resistance for workers and provide a smoother surface for the final shingles. In regions with heavy rainfall or snow, a robust underlayment can significantly extend the life of the roof by reducing roof deck rot and water damage.
Choosing Felt Shingles At B And Q
When selecting products at B&Q, consider these factors:
- Roof Type And Pitch: Steeper roofs benefit from lighter synthetic underlayments, while low-slope roofs may rely on asphalt felt for cost savings.
- Climate And Weather: Areas with heavy rainfall, wind, or snow require more durable underlayments and better seam sealing options.
- Code Compliance: Ensure the product meets local building codes and manufacturer recommendations for underlayment in your region.
- Installation Guidelines: Read product data sheets for application methods, exposure ratings, and cold-weather performance.
- Warranty And Longevity: Review warranty terms and expected service life to align with project plans.
For US readers, it’s important to note that B&Q is a UK retailer. Availability, product lines, and sizing may differ from American stores. When shopping in the United States, equivalent options can be found at Home Depot, Lowe’s, and other local suppliers under names like roofing felt or synthetic underlayment. Compare similar performance ratings and installation requirements to select the best option for the project.
Installation Basics
Proper installation is crucial for maximizing performance. Steps generally include:
- Deck Preparation: Ensure the roof deck is clean, dry, and free of protrusions. Repair any damaged boards before applying underlayment.
- Underlayment Orientation: Roll out from the eave to the ridge, aligning seams with favorable wind directions. Overlap seams per manufacturer guidance, typically by several inches.
- Sealing And Fastening: Use compatible nails or staples and seal seams with recommended tapes or sealants at critical joints, valleys, and penetrations.
- Overlap And Exposure: Follow the specified exposure rating to ensure proper water shedding and wind resistance. Do not exceed recommended exposure, which can compromise protection.
For safety, always wear appropriate PPE and adhere to local codes. A professional roofer can verify that underlayment choices and installation meet structural and weather-related requirements. Consider weather windows for installation to avoid moisture-related complications.
Maintenance And Longevity
Felt shingles require minimal ongoing maintenance but benefit from periodic checks. Key maintenance steps include:
- Inspect After Severe Weather: Look for lifting, wrinkles, or tears and address promptly to maintain integrity.
- Clean Debris: Remove leaves and branches from the roof to prevent moisture retention and premature aging of the underlayment.
- Ventilation And Insulation: Ensure attic ventilation is adequate to minimize condensation that can affect the underlayment’s performance.
- Replacement Considerations: If underlayment shows significant wear or damage, plan a replacement during reroofing to preserve deck protection.
While traditional asphalt felt may degrade faster in UV exposure, synthetic underlayments generally maintain integrity longer. Regular inspection after extreme weather helps detect issues early and extend roof life.
Cost And Availability In The US Context
Exact pricing varies by material, thickness, and brand. In the United States, asphalt-saturated felt often ranges from modest to moderate cost, while synthetic underlayments tend to be higher in price but offer longer life and better performance. When budgeting, include installation materials, tapes, and fasteners as part of the total project cost. Compare manufacturers’ warranties and local building code requirements to ensure the selected product provides appropriate protection for the climate and roof design.
For American homeowners, consider equivalent products from local retailers such as Home Depot or Lowe’s, and consult a licensed contractor to confirm compatibility with existing roofing materials and local regulations. While B&Q products can serve as a reference, US buyers should verify that any imported items meet U.S. standards or look for domestically available alternatives with similar specifications.
Key Takeaways: Felt shingles provide a moisture barrier and improve roof longevity; synthetic underlayments offer superior durability, lighter weight, and ease of installation; always follow manufacturer guidelines and local codes for best results. When shopping, prioritize climate suitability, warranty coverage, and proper installation practices to maximize the roof’s protection and lifespan.