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FOAMULAR® Insulating Sheathing is a high-performance extruded polystyrene (XPS) rigid foam panel with film facers, designed to create a continuous thermal barrier over exterior walls.
Engineered for wood or metal framing, it delivers long-lasting R-value, superior moisture resistance through patented Hydrovac® processing, and easy handling for quick installation.
Durable and damage-resistant, FOAMULAR® IS panels improve energy efficiency while forming part of a robust building envelope.
FOAMULAR is ideal for continuous exterior wall sheathing for wood or steel framing; underlayment for siding, stucco, brick veneer, or stone; foundation walls, crawlspaces, and cavity wall insulation.
High R-Value: Offers R‑5 per inch of thickness, maintaining thermal performance over time
Moisture-Resistant: Closed-cell XPS resists water absorption (<0.3% by volume) and tolerates wetting without losing R-value
Durable Construction: Withstand compressive forces (15 psi minimum) and provide impact resistance for over 100 years
Easy to Work With: Panels are lightweight, easy to cut and score, and include film facers for added strength
Code-Compliant: Meets ASTM C578 Type X standards; available in UL-listed assemblies
Low VOC: GREENGUARD Gold certified, ensuring better indoor air quality
Thermal Efficiency: Reduces heat loss, improving building comfort and lowering energy costs
Moisture Resilient: Performs in wet conditions, preserving structural integrity
Labor-Saving: Simplifies installation and speeds project timelines
Long-Term Value: Backed by Owens Corning's limited lifetime warranty—the product maintains ≥90% of its R-value for the life of the building
