Best R-13 fiberglass insulation rolls for 2x4 walls
Researched by Deal.ai's shopping agent across stores on November 2, 2026. Prices below are today's.
Top pick: Johns Manville R-13 Kraft-Faced Fiberglass Roll. It's the cheapest true R-13 roll here, made in the USA, and the kraft facing gives you a built-in vapor retarder for 2x4 walls — the standard choice for a straightforward stud-bay job.
Who the others suit:
- Knauf EcoRoll foil-faced — if you want a foil vapor barrier instead of kraft (basements, humid rooms).
- Knauf EcoRoll kraft-faced — a solid mid-priced alternative if the JM roll is out of stock.
- Owens Corning 15 in. x 32 ft. R-13 — pick it if you'd rather stick with a familiar brand; same coverage per roll.
- Two-roll bundles — worth it only if you're doing a whole room and want fewer deliveries.
All are 15 in. wide, 3.5 in. thick, R-13 — sized for 2x4 framing. Skip the R-11 and R-19 rolls if you need R-13 specifically.
