WALLTITE® RSB

Spray Foam Magazine – Fall 2025 – A next-generation closed-cell spray polyurethane foam that blends performance, sustainability, and sprayability—engineered to meet today’s green building demands.

BASF’s latest innovation in closed-cell spray polyurethane foam, WALLTITE RSB, is designed to meet the growing demand for sustainable construction without compromising performance. Developed to help reduce the environmental footprint of buildings, this HFO-based insulation system contains high levels of recycled and renewable content and boasts an improved overall product carbon footprint. It’s the smart choice for contractors, architects, and builders who want high-performance insulation with third-party verified environmental benefits.

Sustainability at Its Core

WALLTITE RSB stands for Recycled, Sustainable, and Biobased—three pillars that reflect not only what’s in the product, but also the impact it delivers. Its proprietary resin formulation includes both biobased and high recycled content by volume.

This sustainability is backed by results: the foam is Certified Biobased within the USDA BioPreferred® Program and UL Solutions-verified for recycled and bio-based content, providing trusted credentials that support compliance with LEED, EPA recommendations, and public and private sector green building standards.

WALLTITE RSB’s independently verified Environmental Product Declaration (EPD) demonstrates a measurable reduction in embodied carbon, helping project teams meet emerging low-carbon construction mandates and sustainability goals.

Performance Without Compromise

Sustainability doesn’t come at the cost of performance. WALLTITE RSB matches or exceeds the physical properties of existing HFO-based foams, with an R-value greater than 7.0 per inch. It performs reliably in cold temperatures with no dripping and maintains a consistent spray pattern across a wide range of conditions. Minimal gun cleaning and smooth application have earned it praise from evaluations with applicators.

Field-Tested and Contractor-Approved

Contractor feedback has confirmed the product’s superior handling and consistent finish. “Love how it sprays at 120–125°F,” one contractor noted. “Very easy to lay down a 2" single pass, and a 2” x 2” with no dwell time—love the smooth finish.” The wide processing window and excellent adhesion to various substrates make it an adaptable solution for diverse jobsite needs.

Ready for Market—and the Future

With proven environmental performance, third-party certifications, and application simplicity, WALLTITE RSB delivers long-term value. It helps reduce total embodied carbon while supporting energy efficiency for the life of the building—making it a powerful asset for sustainable design, exclusive project specifications, and green certifications.  

Direct any questions about the products mentioned in this article to BASF at www.spf.basf.com or call 1-888-900-FOAM.