Westlake Royal SwiftAnchor Synthetic Base Sheet 40 in x 300 ft, 1000 sq ft

Westlake Royal SwiftAnchor Synthetic Base Sheet is a professional-grade synthetic underlayment engineered to provide superior protection beneath shingles, shakes, tile, or metal roofing. Each 40 in × 300 ft roll covers 1,000 sq ft and is designed with a high-strength, nonwoven surface that resists tears during installation. This synthetic construction is designed to lay flat and provides a slip-resistant walking surface to enhance safety and ease of use during installation.

Because the underlayment is made from durable synthetic materials, it does not absorb water or wrinkle like traditional felt. The material resists mold growth, ensuring a dry and stable roof deck. AC698 SwiftAnchor offers superior tear strength compared to traditional #15 felt, delivering excellent wind resistance and durability even during heavy roof traffic and harsh weather conditions.

AC698 SwiftAnchor is lightweight, with a nominal weight of 45 lbs per roll, and can be easily handled by roofing crews. Its advanced backside non-slip coating and long-lasting UV stability allow for faster, wrinkle-free installation and extended protection for the roof deck until the primary roofing material is applied.

• Roll size: 40 in W × 300 ft L (1,000 sq ft coverage)
• Synthetic material – Nonwoven, water-resistant construction
• Slip-resistant surface for enhanced installation safety
• Superior tear strength compared to #15 felt
• UV resistance for extended exposure
• Ideal under shingles, shakes, tile, metal, and synthetic shingles
• Manufacturer part number: AC698
• Weight: Approx. 45 lbs per roll

Fast, contractor-friendly installation

AC698 SwiftAnchor is engineered for easy handling and quick installation. The high-quality, lightweight material features a non-slip surface for added safety on the job site, allowing roofing professionals to work faster and with fewer complications. The rolls are designed to lay flat, improving the ease of installation and minimizing wrinkles. AC698 SwiftAnchor can be cold-nailed or stapled and is compatible with a wide variety of roofing systems, making it a versatile choice for both residential and commercial applications.

Durability in extreme conditions

AC698 SwiftAnchor passes ASTM performance standards and is resistant to harsh environmental conditions, including extreme heat, heavy rain, and high winds. Its strength and flexibility make it suitable for use in a variety of climates, including cold temperatures where traditional felt may become stiff and difficult to handle.

Certified for performance

AC698 SwiftAnchor is a trusted choice among roofing professionals, meeting key industry standards such as ASTM D8257 and Miami-Dade County Product Approvals, ensuring reliability and superior protection under shingles, shakes, tile, and metal roofing.

Dimensions

Roll: 40 in × 300 ft

Weight

45 lbs per roll