About Resisto A-Grade Ice and Water Shield
Resisto A-Grade Ice and Water Shield is a premium underlayment boxed with a full factory warranty and designed for professional roofing applications. This self-adhesive membrane provides high performance protection against ice dams, wind-driven rain, and water penetration in critical roof areas. Contractors choose this A-grade ice and water shield for its strong adhesion, durable construction, and proven reliability on both reroofs and new construction.
Manufactured as product LB1236, this membrane features fiberglass fleece reinforcement combined with SBS modified bitumen for increased flexibility and long-term bonding strength. It is engineered to install cleanly and seal tightly to the roof deck, forming a durable moisture barrier that supports premium roofing system performance.
The product is designed primarily for eave protection, but contractors also use it confidently in valleys, transitions, and other vulnerable sections where roofing underlayment must deliver consistent waterproofing and long-lasting adhesion.
Key Benefits
- Premium underlayment with full factory warranty for professional installers
- Strong adhesion from SBS modified bitumen for secure deck bonding
- Fiberglass fleece reinforcement for added durability and stability
- Non-slip sanded finish for safer handling on the roof
- Self-sealing around nails and screws to improve watertight protection
- Designed for eave protection and other high-risk moisture areas
- A-grade ice and water shield built to withstand temperature fluctuations
- Meets Florida Building Code requirements: FL2569 and FL17084
Technical Notes
This ice and water shield is constructed using SBS modified bitumen, which enhances flexibility, cold-weather performance, and deck adhesion. The fiberglass fleece reinforcement improves dimensional stability, helping the membrane stay intact during installation and temperature changes. The non-slip sanded surface provides safer footing, while the self-adhered backing creates a continuous seal that helps protect roof assemblies from moisture infiltration.
With product approvals FL2569 and FL17084, this A-grade membrane is suitable for use in regions that require Florida Building Code compliance. As part of a complete roofing underlayment system, it offers premium performance when paired with synthetic underlayment across the remaining roof deck.
Where to Use This Roofing Underlayment
Resisto A-Grade Ice and Water Shield is typically installed in high-risk moisture zones, including:
- Eaves and roof edges (primary use)
- Valleys and transitions
- Around roof penetrations and flashing locations
- Dormer and sidewall intersections
- Low-slope areas within installation guidelines
This premium membrane enhances the waterproofing capability of the entire roof system when installed in critical areas before applying shingles or other roofing materials.
Wholesale and Contractor Supply Options
VanBoxel Supply provides A-grade ice and water shield in contractor-focused quantities, supporting both small residential work and high-volume re-roof projects. Buying premium underlayment through a dedicated roofing supplier like VanBoxel helps crews maintain inventory while keeping project costs predictable and supply consistent.
