Choosing the right batt insulation helps improve energy efficiency, comfort, and indoor air quality. This guide highlights five widely used fiberglass batt options that relate to R-24-level performance and beyond, focusing on attic and wall applications. Each product offers distinct features, installation notes, and suitability for different spaces. Use the summary table below to compare square footage, facings, and typical uses before diving into detailed product sections.
| Product | Brand | Square Footage | Facing | |
|---|---|---|---|---|
| R-38 Kraft Faced Fiberglass Batt | Owens Corning | 512 sq ft | Kraft Faced | Attics (2×12) and interior ceilings |
| R-19 Faced Fiberglass Batt | Owens Corning | 1,280 sq ft | Kraft Faced | Exposed exterior-facing walls and floors |
| R-13 Unfaced Fiberglass Batt | Owens Corning | 1,782.5 sq ft | Unfaced | Interior walls (2×4) and internal spaces |
| R-19 Unfaced Fiberglass Batt | Owens Corning | 1,440 sq ft | Unfaced | Walls and interior applications (2×6 supported) |
| R-19 Unfaced Fiberglass Batt | Johns Manville | 1,440 sq ft | Unfaced | Walls and interior applications (2×6 supported) |
Owens Corning R-38 Kraft Faced Batt for Attics
This product provides a Kraft-faced fiberglass batt designed for attic installations between trusses. It’s sized to fit 24 by 48 inch bays and is recommended for attic spaces with proper vented air space to prevent moisture buildup. It offers a total of 512 square feet across eight batt packs per bag, with a total of eight bags per bundle. The absence of a paper backing makes handling simpler, though Kraft faced material remains present on the batt surface for moisture resistance in appropriate applications. It is not suitable for exterior walls but serves well in interior walls, ceilings, and attics with adequate ventilation.
Key considerations:
- Attic suitability and air space requirements to avoid moisture issues
- Unfaced insulation is not applicable here due to Kraft facing, but serves moisture protection
- Compatibility with 2×12 framing and attic workflows
Owens Corning R-19 Faced Batt for Floors and Walls
This 24 by 96 inch batt set is designed for 2×6 exterior walls and related areas. It includes Kraft facing and provides coverage totaling 1,280 square feet across two bundles of five bags. The moisture barrier on the facing makes it suitable for exterior-facing applications where moisture control is needed. While priced as a bulk package, it is commonly used in both new construction and retrofit projects to reach efficient thermal performance.
Key considerations:
- Kraft facing offers moisture control benefits in appropriate settings
- Ideal for 2×6 wall assemblies and related applications
- Bulk bundles for larger projects with consistent coverage
Owens Corning R-13 Unfaced Batt for 2×4 Walls
This unfaced insulation is tailored for 2×4 walls and provides a substantial footprint of 1,782.5 square feet across eight bags (two bundles of four). The absence of a moisture barrier makes it suitable for interior wall assemblies where moisture exposure is limited. The product line supports retrofit work and new construction where unfaced insulation is preferred, with adequate framing clearance and ventilation considerations.
Key considerations:
- Unfaced design simplifies layering with other barrier systems
- Best used in interior wall cavities with proper framing clearance
- Bulk quantities enable efficient project throughput
Owens Corning R-38 Kraft Faced Batt for Attics (Alternate Sizing)
This option mirrors the R-38 kraft-faced approach but emphasizes flexibility in larger attic spaces, including 2×12 configurations. It allocates eight bags per bundle, totaling 512 square feet, with two bundles making up the full package. The packaging and wording suggest a broad buying option to accommodate renovation or expansion projects, with emphasis on attic installation and ventilation practices. Buyers should plan for consistent layering techniques to maximize R-value in attic assemblies.
Key considerations:
- Kraft facing provides moisture management in attic environments
- Design aligns with larger attic footprints and 2×12 framing
- Vendor notes suggest options for ordering in bulk or multiple bundles
Johns Manville R-19 Unfaced Batt for 2×6 Walls
This Johns Manville option provides unfaced R-19 fiberglass batt insulation for 2×6 walls. The package totals 1,440 square feet across ten bags (two bundles of five). Unfaced insulation is suitable where additional vapor barriers or permeability management is required. It supports interior wall retrofits and new construction projects with standard 2×6 wall assemblies, offering a balance of thermal performance and installability.
Key considerations:
- Unfaced design for flexible barrier integration
- Good match for 2×6 wall cavities and retrofit work
- Bulk bundles facilitate larger project timelines
Buying Guide: Key Purchase Considerations for Batt Insulation
- R-value requirements: Determine the desired thermal resistance for each space (attics, walls, floors) to select the appropriate batt thickness and density.
- Facing and moisture control: Kraft-faced batts provide a moisture barrier suitable for certain exterior or high-humidity situations; unfaced batts require separate vapor barriers or barrier systems in some assemblies.
- Application area: Attics typically require batts that fit between joists and allow air flow; walls require snug fits within stud bays (2×4 vs 2×6) to maximize performance.
- Ventilation: In attic spaces, ensure proper air space and venting to prevent moisture buildup and insulation degradation.
- Installation ease: Consider batts with easier handling (unfaced vs faced) and consistent thickness to reduce gaps and improve overall R-value.
- Bulk vs. single bundles: For larger renovations, bulk bundles offer cost efficiency and consistent coverage; for smaller projects, smaller packs may be more convenient.
- Compatibility: Verify compatibility with existing vapor barriers, sheathing, and climate zone requirements to ensure proper performance.
- Sound and fire considerations: Some products offer additional sound attenuation or fire-rated components; verify local code compliance and product specs.
- Installation guidelines: Follow manufacturer guidance on spacing from fixtures, wires, and heating elements; avoid compressing batts beyond recommended thickness to maintain R-value.