BEEST SeamSecure Waterproofing Membrane – 4x160' Non-Adhesive Polyester

Premium strength for tough waterproofing tasks

Meet BEEST SeamSecure, a purpose-built 4-inch wide fabric membrane designed to work hand-in-hand with BEEST coatings. Non-adhesive by design, it acts as a reinforcement layer you can place over joints, cracks, and seams to help create a continuous waterproof barrier along roof lines, vents, skylights, and shower walls.

The fabric is forged from 100% stitch-bonded polyester, a standard in roofing for its sturdy tension and long-lasting performance. The weave feels dense yet flexible in your hands, and the roll unfolds with a reassuring snap and subtle texture as you align it over a seam. This combination of strength and handling makes it a practical partner for demanding waterproofing tasks.

What this membrane is best at

• Bridging gaps and sealing cracks: the 4-inch width makes it easy to cover moderate separations and irregular joints, creating a smoother substrate for coating.
• Fortifying joints and reinforcing seams: the fabric provides an additional layer of reinforcement that supports long-term performance around vents and skylights.
• Contractor-grade repair approach: apply a robust layer of BEEST coating, embed the fabric into the coating, and apply more coating on top to form a resilient waterproofing system.
• Coatings compatibility: seamlessly pairs with BEEST Waterproof Sealant, Foundation Sealant, and RV Roof Sealants to protect roofs, planter boxes, shower stalls, gutters, and trailers.
• Made in the USA by a family-owned company: Carlisle, Pennsylvania based, with a 100% satisfaction guarantee and responsive customer service teams.

Where you can use SeamSecure

• Roof repairs and work around skylights and vents
• Shower walls and bathroom zones needing reinforced waterproofing
• Planter boxes, gutters, and exterior fixtures
• Trailer exteriors and mobile installations

While SeamSecure is designed to work with BEEST coatings, actual results can vary based on surface preparation, climate, and coating selection. Consider it a versatile option to add strength and redundancy to your waterproofing plan, rather than a guaranteed fix.

Storage and handling are straightforward: store in a dry place, away from direct sun, and unroll as needed to minimize wrinkles before embedding in coating. With BEEST’s support, you can count on a consistent experience from initial prep to final finish.