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Model #U4924

Store SKU #1003531721

R-49 Unfaced Fiberglass Insulation Batt 24 in. x 48 in. (8-Bags)

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  • R-49 offers efficient noise and thermal control
  • Keeps rooms cool in summer and warm in winter for low energy cost
  • Ideal for wood-framed attics and ceilings
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Product Overview

JM Unfaced Formaldehyde-free fiberglass insulation offers R-values ranging from R-11 to R-38, as well as effective thermal and noise control. it delivers comfort helping homes stay cooler in the summer and warmer in the winter to reduce energy costs. Our Unfaced fiberglass insulation is available in pre-cut batts for standard-sized wall cavities and in rolls that can be cut to fit any size cavity. Great for: new construction and remodels.
  • For use in wood-framed attics and ceilings
  • Batts are pre-cut for use in standard 8 ft. walls with 24 in. on-center stud spacing
  • Unfaced without a vapor retarder can be added to existing insulation
  • Improves energy efficiency and provides sound control
  • JM is a partner of the seal and insulate with ENERGY STAR program
  • SCS recycled content certification
  • GREENGUARD Gold certified for office indoor air quality and SCS certified for home indoor air quality

Info & Guides

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Cover Area Per Bag (sq. ft.)
48 ft²
Coverage Area (sq. ft.)
384 ft²
Product Length (ft.)
4 ft
Product Thickness (in.)
13.5 in
Product Width (in.)
24 in


Bag Size
4.17 ft. x 20 in. x 20 in.
Batt/Roll Size
4 ft. x 13.5 in. x 24 in.
Compatible Install Surface
Cement,Concrete,Copper Pipes,Existing Drywall,Existing Insulation,Fiberglass,Metal,PVC/CPVC Pipes,Pex Pipes,Plywood,Tile Flooring,Wood
Faced or Unfaced
Insulation Features
Formaldehyde Free,Friction Fit,Soundproofing Insulation
Insulation Location
Attic,Ceiling Insulation
Insulation R-Value
Insulation Type
Number of Pieces
Pack Size
Product Weight (lb.)
40.24 lb
Roll or Batt

Warranty / Certifications

Warranty Information

Questions & Answers

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Customer Reviews

  • 4.5
    out of 2 reviews
  • 100% recommend this product
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excellent product,extra thick 14-16 inches, house is breathing,love it
excellent product,extra thick 14-16 inches, house is breathing,love it
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  • Recommended
1 person found this helpful
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Rating provided by a verified purchaser
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Showing 1-2 of 2 reviews