Every major insulation format explained — when to use each and where each performs best.
Walk into any construction supply context and you'll encounter four or five distinct insulation formats. They're not interchangeable — each format has specific applications, installation requirements, and performance trade-offs. Here's what you need to know.
Batts are pre-cut sections of insulation designed to fit standard stud and joist bays. They're the most common format for residential construction and what most contractors order by the bag.
When to use: Wall cavities (2×4 or 2×6 framing), floor joists over crawlspaces, attic floors where access allows, and ceiling assemblies.
R-values available: R-11 through R-49, depending on product and thickness.
Installation: Friction-fit into bays. No adhesive, no mixing — fast to install for experienced crews.
Variants: Kraft-faced (vapor retarder on one face), unfaced (for mixed-climate and double-stud applications), and foil-faced (radiant barrier applications).
Rolls are the same material as batts but cut to longer continuous lengths. Some contractors prefer rolls for long, uninterrupted bays (such as attic floors) since there are fewer seams. Coverage per roll is typically higher than per bag of batts.
When to use: Attic floors with long, clear runs — particularly in renovation work where cutting batts to non-standard lengths is common.
Loose-fill insulation is blown into place using a pneumatic machine. It's available in fiberglass, cellulose, and mineral wool formats. Common for attic floor applications where it can be blown to uniform depth without gaps around obstructions.
When to use: Attic floors (especially over existing insulation), irregular cavities, and hard-to-reach areas.
Trade-offs: Requires blowing equipment; settling over time means initial depth must overshoot the target R-value; harder to achieve consistent density without experience.
Rigid foam boards are manufactured panels of foam insulation. Higher R-value per inch than batts (R-3.8 to R-6.5 per inch depending on type), making them useful where space is constrained.
When to use: Continuous insulation over framing (to reduce thermal bridging), basement walls, under-slab applications, sheathing layers.
Trade-offs: Higher cost per R than batts; requires separate air barrier in most assemblies; some types degrade in UV exposure.
Spray foam is applied as a liquid that expands and cures in place. Available in open-cell (lower density, lower R-value, vapor-permeable) and closed-cell (higher density, higher R-value, vapor barrier) formulations.
When to use: Rim joists, cathedral ceilings with limited depth, irregular cavities, air-sealing applications. Closed-cell for below-grade or high-moisture environments.
Trade-offs: Significantly higher cost than batts; requires trained installation crew; harder to inspect post-installation; some environmental concerns with certain blowing agents.
Prestige Insulation specializes in fiberglass batts and mineral wool batts — the most commonly ordered insulation format for residential and commercial projects across the U.S. We stock R-11 through R-49 in both facing types and all standard widths.
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