R-21 Unfaced Fiberglass Wall Batts

JM R-21 unfaced fiberglass batt insulation is designed to improve thermal performance and help reduce unwanted sound transfer in interior wall cavities. Pre-cut batts fit standard 2x6 wood-stud walls and can be added to existing insulation where no vapor retarder is desired.

Key Features:

• Thermal + Sound Control: R-21 performance helps manage heat flow while also supporting sound control in wall cavities
• Unfaced Design: No built-in vapor retarder—ideal for adding to existing insulation or assemblies that require separate vapor control
• Sized for Standard Framing: Pre-cut for 2x6 wood-stud walls with 16-in on-center spacing (15-in wide batts)
• Easy Press-Fit Installation: Designed to press in place between studs for straightforward DIY or pro installs
• Durable Fiberglass: Will not rot, mildew, or deteriorate; noncorrosive to pipes, wiring, and metal components

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What wall cavities does this insulation fit?
A: It’s sized for 2x6 walls with 16-inch on-center stud spacing (15-inch wide batts).

Q: Does this batt include a vapor barrier?
A: No—this is unfaced insulation and does not include a vapor retarder.

Q: Where can it be used?
A: It’s intended for wall applications and is noted for use in basements; it is not listed for attics, ceilings, or floors on the provided spec sheet.

Q: How much area does one package cover?
A: Coverage is listed as 76.56 sq ft per package.

Q: Is it certified for indoor air quality?
A: It’s listed as GREENGUARD Gold Certified and formaldehyde-free in the provided specifications.

Quiet Luxury, Hidden in the Walls

The most elevated spaces are never just about what you see—they’re about how the room feels. These unfaced R-21 fiberglass batts create a calmer, more temperature-stable backdrop, softening noise and supporting energy-smart comfort without changing your visual palette. Designed to slip cleanly into standard 2x6 wall cavities, they’re a discreet upgrade that lets your finishes—and your life—take center stage. It’s the kind of behind-the-scenes essential that makes everyday living feel undeniably luxe.

Upgrade your 2x6 walls with JM R-21 unfaced fiberglass batts for comfort-forward energy savings and better sound control.