10 in. R-30 solution for deep joist bays without stacking thinner batts
Key features
19.25 in. width aligns with common 24 in. o.c. framing modules
Kraft facing plus Next Gen handling for productive attic and floor crews
Technical specifications
| R-Value | 30.0 |
|---|---|
| Thickness | 10.0 in |
| Width | 19.25 in |
| Length | 48.0 in |
| Coverage | 64.17 sq ft/pack |
| Material | Fiberglass (PINK Next Gen) with kraft vapor-retarder facing |
| Fire rating | ASTM C665 Type I; glass fibers ASTM E136 noncombustible when unfaced. Kraft facing is combustible—follow OC guidance for ICC construction types and rated assemblies. |
| Sound rating | Cavity-fill fiberglass improves typical assembly acoustics versus an empty cavity; STC is framing- and opening-dependent. |
| Density | Light-density flexible batt per ASTM C665 manufacturer Type I listings |
| Thermal conductivity | Nominal R-value at full labeled thickness; see manufacturer TDS for tested thermal values. |
| Framing width | 19.25 in. width for nominal 2x10 joists at 24 in. on-center spacing |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Wood- and metal-framed floors, ceilings, and roof decks; interior side of basement and unvented crawlspace walls per code |
Product details
About 64.17 sq ft per bag. Primary use: deep floor or ceiling joists on 24 in. on-center (e.g. nominal 2x10 bays). K83 is the standard high-R workhorse when you are insulating nominal 2x10 floor or ceiling joists on 24 in. centers: the 19.25 in. width matches common 24 in. o.c. layouts, the 10 in. thickness is sized for labeled R-30 performance at full recovery, and the 48 in. length keeps bundles easy to stage in tight attics.
PINK Next Gen Fiberglas is engineered for softer handling, less dust, and better recovery after compression packaging, while the kraft facing supports vapor-retarder strategies on the warm-in-winter side when your climate detail calls for it. Installer discipline still matters: do not leave voids at rim joists, do not compress batts behind ducts, and keep facing orientation consistent with IECC and local amendments. Distributor spec pages list about 64.17 square feet per package—reconcile that number to your truss layout, stairwell openings, and mechanical chases before you lock truck quantities.
Download the manufacturer data sheet for tested properties, code language, and handling guidance specific to the K83 SKU. K83 delivers labeled R-30 kraft-faced PINK Next Gen fiberglass in a 10×19.25×48 in. batt for deep floor and ceiling joists on 24 in. centers—think attic floors, flat ceilings, and compatible roof decks when depth and venting allow. Use about 64.17 square feet per package for procurement math, then add waste for truss webs, stairs, and hatches.
Next Gen fibers improve recovery and jobsite dust behavior versus older generations, while kraft facing supports vapor-control layers on the warm-in-winter side when the assembly designer directs it. Installer discipline still wins: no compressed wads behind flex ducts, no skipped bays at skylight curbs, and sealed transitions at the air barrier plane. Reference ASTM C665 manufacturing, GREENGUARD validation, and the UL Environment EPD when projects request low-emitting or embodied-carbon documentation alongside thermal compliance.
Documents & certifications
Technical data sheet
Manufacturer-tested R-value, coverage, fire notes, and handling—use for submittals, RFIs, and field QA.
Download PDF (opens in new tab)Certifications & compliance
GREENGUARD (formaldehyde-free validated), UL Environment EPD, California Title 24 Article 3 insulating materials
Frequently asked questions
Is K83 only for attics?
Is K83 only for attics?
No. Any code-compliant cavity that matches the labeled thickness and width—floors, flat ceilings, and some roof assemblies—can use this SKU if the designer specifies R-30 fiberglass batts. Always verify structural depth and ventilation requirements for roof applications.
How do I calculate bags for a truss attic?
How do I calculate bags for a truss attic?
Multiply insulated ceiling area by pitch factor if you are measuring floor plan only, then divide by about 64.17 square feet per bag. Add a disciplined waste allowance for hips, valleys, and hatch openings.
Which side faces the living space?
Which side faces the living space?
Facing orientation follows your vapor-control strategy and climate zone. Do not guess: align with IECC, the project hygrothermal model, and Owens Corning installation literature.
Can I combine this with air-permeable ceiling finishes?
Can I combine this with air-permeable ceiling finishes?
Treat the ceiling line as a system: insulation, air barrier, and interior finish each have roles. If the assembly needs a sealed drywall ceiling for air control, detail penetrations and perimeter sealant per the energy rater.