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Knauf R-13 15 In. x 32 Ft. Greenguard Kraft Faced Roll Fiberglass Insulation

Knauf R-13 15 In. x 32 Ft. Greenguard Kraft Faced Roll Fiberglass Insulation

Last price we saw

$29.67at Family Hardware, last seen Nov 2

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Our take on the Knauf R-13 15 In. x 32 Ft. Greenguard Kraft Faced Roll Fiberglass Insulation

This is a 15-inch by 32-foot roll of Knauf fiberglass insulation rated R-13, with a kraft paper facing on one side. R-13 is the common choice for 2x4 exterior walls and interior partitions in most climates. The roll covers about 40 square feet, so one roll handles a short wall run or a few stud bays. The facing has a Greenguard indoor air quality certification, which matters if you are insulating a room you will occupy soon.

Best for2x4 exterior wall stud baysInterior partition sound and thermal control
DIY patch jobs and small wall runs
Basement or garage wall insulation
Pros
  • R-13 matches standard 2x4 framing depth
  • Kraft facing gives a built-in vapor retarder on the warm side
  • 15-inch width fits between studs with room to staple the flanges
  • Greenguard certified for low emissions
  • Roll format is faster than batts on long, uninterrupted runs
Cons
  • Only about 40 square feet per roll, so large walls need many rolls
  • Fiberglass requires gloves, long sleeves and a mask to install
  • Kraft facing is flammable and must be covered with drywall or another approved finish
  • Compressing it or leaving gaps cuts the R-value
  • Not suited for exposed ceilings or areas with moisture contact

Knauf R-13 15 In. x 32 Ft. Greenguard Kraft Faced Roll Fiberglass Insulation prices at every store

  • Family HardwareCheck price at Family Hardware

Knauf R-13 15 In. x 32 Ft. Greenguard Kraft Faced Roll Fiberglass Insulation price history

Lowest price we've seen: $29.67 on Nov 2 at Family Hardware. Tracked across 1 store since Nov 2.

Specifications

Thermal Type
Blanket
Material
Fiberglass
Use
Duct
Type
Thermal Type

Questions and answers

Is R-13 enough for my 2x4 walls?
R-13 is the standard fill for a 2x4 cavity and meets code in many climate zones for above-grade walls. Colder zones often call for continuous exterior insulation added to the R-13. Check your local code before buying.
How many square feet does one roll cover?
A 15-inch by 32-foot roll covers about 40 square feet. Divide your wall area by 40 and round up, then add a roll for cuts and waste.
Can I leave the kraft facing exposed?
No. The facing is a vapor retarder and a combustible paper, so it needs drywall or another approved interior finish over it. In basements, keep it on the warm side of the wall.
Does the facing go toward the inside or outside?
The kraft facing goes toward the heated side of the wall, which is usually the interior. In hot, humid climates, follow local guidance, since the vapor retarder placement can differ.
What is the difference between this and unfaced insulation?
The facing adds a vapor retarder and stapling flanges, which help in walls. Unfaced rolls are better where you need to avoid trapping moisture, such as over attic floors.
When is the best time to buy insulation?
Insulation prices are steadiest in spring and early fall, outside the pre-winter rush. Compare per-square-foot prices across stores, since roll sizes vary.

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