R-30 batts for cathedral ceilings, attic floors, low-slope roofs, and floor/crawl cavity applications. Wholesale pricing, same-day quotes, next-day delivery nationwide.
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IECC codes in zones 1–3 (warm climates: Florida, Texas, Southern California) require attic insulation of R-30 to R-38. R-30 satisfies zone 1–2 requirements and is a common starting point for zone 3 attic retrofits.
Cathedral and vaulted ceilings require batt insulation that can fit between rafters while allowing air movement. R-30 batts work well in deeper rafter bays where the roof assembly allows full insulation with a vent channel.
R-30 fiberglass batts work well in floor assemblies over unconditioned crawl spaces — particularly in climate zones 4–5 where R-25 to R-30 floor values are required. Unfaced batts friction-fit between joists.
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R-30 batts are approximately 8.5"–10" thick depending on the manufacturer. They're designed to fit in ceiling joist or rafter bays with standard 2×10 or deeper framing.
Yes. Unfaced R-30 batts are commonly laid in attic floor cavities, perpendicular to joists if supplementing existing insulation. In zones 3–4, R-30 attic floors meet the code minimum.
R-38 is approximately 30% more insulating than R-30 and is required in most zone 4–5 attics. If you're in zone 4 or colder, specify R-38 or higher. See R-38 →
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