R-10 Insulation Rolls
Intermediate fiberglass R-value at $0.52 per square foot. 3-inch thickness, fits standard metal building purlin spaces, ideal for light-duty wall insulation and occasional-heat outbuilding applications.
Where R-10 Fits in the R-Value Lineup
R-10 fiberglass insulation occupies the practical middle ground between the lowest-cost R-8 (a condensation-control spec) and the entry-level conditioned-building R-13. It is the spec to pick when R-8 is not quite enough and R-13 is more than the application needs.
The most common reason to choose R-10 over R-8: the building gets heated occasionally rather than continuously. Hobby garages used a few hours per week, workshop spaces where a propane heater fires up while the work happens, and storage buildings that double as occasional retreats — all benefit from the modest thermal step up that R-10 provides without the per-square-foot price jump to R-13.
At Insulation Overstock, R-10 is available with every NAIMA-certified facing in the catalog. VR-R Plus is the cheapest at $0.52 per square foot, just above R-8 ($0.48) and well below R-13 ($0.65). WMP-10/30/50 run $0.58.
R-10 Thickness and Composition
R-10 Nominal Thickness
R-10 fiberglass insulation has a nominal installed thickness of 3.0 inches. This depth fits typical metal building purlin spacings and pole barn girt cavities slightly better than R-8 (2.5") while still avoiding the 3.625" depth required by R-13.
R-10 Roll Dimensions
R-10 rolls ship in 4-foot, 5-foot, and 6-foot widths. WMP-30 is available in 8-foot rolls. Roll lengths typically run 50 feet, giving 200-300 sq ft of coverage per roll depending on width.
Available Facings for R-10
All four NAIMA-certified facings (VR-R Plus, WMP-10, WMP-30, WMP-50) plus black-faced variants are available in R-10. Facing selection follows the same logic as other R-values — matched to the building's humidity profile and aesthetic preference rather than to the R-value itself.
Where R-10 Insulation Works Best
R-10 Insulation Cost
R-10 sits between R-8 and R-13 in the wholesale pricing line. Cost difference vs neighboring R-values:
- VR-R Plus: $0.52 / sq ft (4 cents above R-8, 13 cents below R-13)
- WMP-10 / WMP-30 / WMP-50: $0.58 / sq ft
- Black-faced variants: $0.56 to $0.62 / sq ft
For a 1,500 sq ft project, R-10 VR-R Plus runs $780 in material vs $720 for R-8 and $975 for R-13 — a $60 to $195 swing across the three R-values for the same square footage. The right choice depends on whether the marginal thermal benefit justifies the marginal cost for your specific use case.
R-10 vs Other Low R-Values
| R-Value | Thickness | VR-R Plus $/sf | Best For |
|---|---|---|---|
| R-8 | 2.5" | $0.48 | Storage, condensation only |
| R-10 | 3.0" | $0.52 | Occasional-heat, light-duty |
| R-11 | 3.5" | $0.55 | 2x4 cavities (under-fill alternative) |
| R-13 | 3.625" | $0.65 | 2x4 walls, Zone 1-2 code minimum |
Choose R-10 over R-8 when: the building will be heated occasionally and you want some thermal benefit beyond pure condensation control.
Choose R-10 over R-13 when: the cost difference matters and the building does not need code-compliant performance.
Upgrade to R-13 when: the framing is 2x4, the location is Zones 1-2, or the building will be heated continuously through winter.
R-10 Insulation FAQ
What is R-10 insulation used for?
R-10 fiberglass insulation fits between R-8 (condensation-only) and R-13 (occupied 2x4 walls). It is the standard pick for light-duty outbuildings, garages heated occasionally rather than continuously, and metal buildings where you want slightly better thermal performance than R-8 without the additional cost of R-13.
How thick is R-10 insulation?
R-10 fiberglass insulation is 3.0 inches thick at nominal installed depth. The profile fits standard metal building purlin spaces and intermediate cavity depths that fall between R-8 and R-13 dimensional ranges.
How much does R-10 insulation cost per square foot?
Wholesale R-10 fiberglass insulation costs $0.52 per square foot for VR-R Plus and $0.58 per square foot for WMP-10, WMP-30, or WMP-50 facings. It runs 8 cents per square foot above R-8 and 13 cents below R-13.
Is R-10 enough for a heated garage?
R-10 is borderline for heated garages. It provides better thermal performance than R-8 but does not meet IECC residential code wall minimums anywhere in the U.S. For occasional-use heated garages in Zones 1-2, R-10 is acceptable. For garages heated regularly through winter or in Zones 3+, step up to R-13 or R-19.
Where does R-10 fit in the R-value lineup?
Can R-10 be installed in 2x4 walls?
Yes, but it under-fills the 3.5-inch cavity by half an inch, creating a small air gap behind the insulation that reduces effective thermal performance. For 2x4 walls, R-13 is dimensionally correct and rated to perform fully.
Order R-10 Fiberglass Insulation
Wholesale R-10 with every facing available. The right choice when R-8 is not quite enough and R-13 is more than the application needs.
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