Rockwool RXCB351525 Stone Wool Batt Insulation R-15

Product Description

The ROCKWOOL RXCB351525 is a semi-rigid stone wool batt insulation rated R-15, designed for wood stud and joist framing in residential construction and renovation applications. The batt features a flexible edge that compresses during insertion into wall cavities, attic bays, ceiling frames, and floor assemblies, then springs back to expand fully against the framing members for a complete fill. This self-adjusting edge design compensates for normal stud-center variations caused by warping or distortion, ensuring consistent thermal performance. The stone wool composition makes this batt non-combustible, water resistant, and resistant to mold and mildew growth.

This product is suited for new residential builds and retrofit insulation projects where wood stud or joist framing is present. Typical applications include exterior walls, interior partition walls with acoustic requirements, attic floors, and framed floor assemblies. The batt is sized for standard 16-inch on-center framing at 47 inches in length. Its semi-rigid form holds position without sagging during and after installation. The material is free of CFCs and HCFCs and is manufactured from natural and recycled materials, making it compatible with LEED credit documentation.

Key Features

• R-15 thermal resistance rating for wood stud framing applications
• Flexible edge compresses for insertion and expands to fill the cavity completely
• Non-combustible stone wool construction
• Water resistant with low moisture absorption; does not rot or support mold or mildew growth
• Excellent sound absorption for partition and exterior wall assemblies
• CFC-free and HCFC-free; made from natural and recycled materials
• Compatible with LEED project documentation

Compatibility

Designed for use in standard 16-inch on-center wood stud and joist framing in residential new construction and renovation assemblies including exterior walls, attics, ceilings, and floor frames.

Installation Notes

Installation is typically performed by insulation contractors, framers, or general construction trades working to local energy codes such as the IECC. Cut batts with a utility knife and straightedge to fit around obstructions. Ensure the cavity is clear of debris and that vapor control measures comply with local building code requirements before enclosing the assembly with sheathing or drywall.