Johns Manville R-30 Unfaced Fiberglass Roll Insulation, 31.25-sq ft Coverage (15-in W x 25-ft L), Multi-Pack, B390SR 30 Unfaced Fiberglass Roll Insulation, 15 in x 25 ft Boost attic efficiency with Johns Manville R 30 unfaced fiberglass roll insulation. Each 15 in x 25 ft roll covers 31. 25 sq ft and is designed for 16 in on center joists, delivering thermal performance and sound control without a vapor barrier. Key Features: High Thermal Performance: R 30 fiberglass roll helps reduce heat loss and improve energy efficiency in attics and ceilings. Unfaced Design:

R-30 Unfaced Fiberglass Roll Insulation, 15-in x 25-ft

Boost attic efficiency with Johns Manville R-30 unfaced fiberglass roll insulation. Each 15-in x 25-ft roll covers 31.25 sq ft and is designed for 16-in on-center joists, delivering thermal performance and sound control without a vapor barrier.

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Key Features:

• High Thermal Performance: R-30 fiberglass roll helps reduce heat loss and improve energy efficiency in attics and ceilings.
• Unfaced Design: No vapor barrier—ideal for adding over existing insulation where moisture control is managed elsewhere.
• Easy to Install: Sized for 16-in on-center wood studs; simply press in place between joists.
• Durable, Safe Materials: Formaldehyde-free fiberglass that won’t rot, mildew, or corrode pipes and wiring; GREENGUARD Gold certified.
• Sustainability Credentials: SCS Recycled Content certification and ENERGY STAR partner alignment.

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Specifications Table:

Specification	Details
R-Value	30
Coverage Area	31.25 sq ft per roll
Roll Dimensions	15 in W x 25 ft L
Thickness	9.25 in
Faced/Unfaced	Unfaced
Stud/Joist Spacing	16 in on center
Insulation Type	Fiberglass
For Use in Attics	Yes
For Use in Ceilings	Yes
For Use in Walls	No
For Use in Floors	No
Framing Type	Wood studs
Formaldehyde Free	Yes
Sound Barrier	Yes
Reflective	No
Vapor Retardant	No
ENERGY STAR Certified	Yes (program partner)
GREENGUARD Gold Certified	Yes
SCS Recycled Content	Yes
Warranty	1-year limited
Bag Dimensions (L x W x D)	15 x 15 x 22 in
Package Type	Multi-pack
Package Count	12
Total Package Quantity	12
R-Value per Inch	3.24
Width	15 in
Length	25 ft
UNSPSC	30141500
Fits 2 x 4 Walls	No
Fits 2 x 6 Walls	No
For Use in Basements	No
For Use in Crawlspaces	No
For Use in Doors/Windows/Duct/Electrical/Plumbing/Vents/Masonry/Garage Doors	No

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Frequently Asked Questions (FAQ):

Q: How much area does one roll cover?
A: Each roll covers 31.25 sq ft (15 in. wide x 25 ft. long).

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Q: Is a vapor barrier included?
A: No. This is unfaced insulation and does not include a vapor retarder.

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Q: Where is this product best used?
A: Designed for attics and ceilings in wood-framed construction with 16-in on-center spacing.

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Q: What is the roll thickness?
A: Approximately 9.25 inches thick to achieve R-30.

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Q: Is it safe for indoor air quality?
A: Yes. It is GREENGUARD Gold Certified and formaldehyde-free.

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A Cloud-Soft Layer of Quiet, Cozy Performance

This plush, alabaster roll lays down like a whisper, instantly elevating an attic into a cocoon of calm and comfort. Its unfaced profile keeps the look clean while delivering steadfast R-30 performance that quiets and insulates. Pair it with warm wood tones and matte-black hardware for a crafted, modern envelope. It’s the invisible luxury that makes every room feel composed and beautifully livable.

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Upgrade your attic with R-30 performance today and start saving on energy bills season after season.