How much do R-24 fibreglass batts cost at building supply stores in Saint John? | Insulation IQ?

R-24 fibreglass batts are one of the most commonly purchased insulation products at building supply stores in Saint John and across New Brunswick, since they are the standard fill product for 2x6 exterior walls in new construction and major renovations. Prices have shifted noticeably since 2021 due to supply chain changes and material costs, so current figures matter when you're budgeting a project.

As of early 2026, R-24 fibreglass batts in the standard 15-inch wide, 47-inch length (for 16-inch o.c. framing) typically retail in the $50 to $75 per bag range at Saint John building supply stores, with each bag generally covering between 40 and 50 square feet of wall area. That works out to roughly $1.10 to $1.75 per square foot of wall coverage at retail pricing.

For a typical Saint John single-storey home with approximately 800 to 1,000 square feet of above-grade exterior wall area (accounting for windows and doors), you might expect to spend $900 to $1,750 in material costs alone for R-24 batts for the walls. A two-storey home with 1,400 to 1,800 square feet of exterior wall area could require $1,500 to $3,000 in batt material.

Several factors affect the actual price you'll pay. Brand is a significant variable — Owens Corning EcoTouch, CertainTeed, and Knauf are the main fibreglass batt brands commonly stocked in Saint John at stores like Home Depot (McAllister Drive), Kent Building Supplies (Retail Drive and Westfield Road), and independent lumber yards. Store-brand or lesser-known imports sometimes undercut by 10 to 15 percent. Faced versus unfaced also affects price slightly — faced batts with a kraft paper or foil vapour retarder facing typically cost 5 to 10 percent more than unfaced batts, though unfaced is actually preferred in most NB wall assemblies where the vapour barrier is a separate 6-mil polyethylene sheet installed over top.

Volume pricing is available at most Saint John building centres for full-pallet orders, which is relevant if you're insulating an entire new build or a large addition. Contractors and builders typically negotiate 5 to 15 percent off retail pricing on volume orders, which is one reason why professional installation quotes can sometimes offer competitive material pricing compared to DIY retail purchases.

It's also worth noting that R-24 versus R-22 products compete in the same cavity space. Some builders specify R-22 because it meets code on paper, but most energy-conscious builders in Saint John now default to R-24 because the incremental cost difference — typically only $3 to $8 per bag — is negligible over the life of the building relative to the modest thermal improvement and the NB Energy Code's direction toward higher performance envelopes.

For NB Power rebates and the Canada Greener Homes Grant, batt insulation costs on retrofit projects may qualify for partial reimbursement when installed as part of an eligible energy efficiency upgrade. The Canada Greener Homes Grant (subject to program availability as of early 2026) historically offered up to $600 for wall insulation upgrades and up to $3,500 for attic insulation, with a mandatory pre- and post-retrofit EnerGuide evaluation. NB Power's Home Energy Efficiency Program also offers rebates for qualifying upgrades — check NB Power's current rebate schedule, as amounts and eligibility tiers change periodically.

One practical budgeting tip: always add 10 to 15 percent to your material estimate to account for waste, off-cuts around windows and doors, and any areas where batts need to be doubled or layered. Underestimating and making a second trip to the store adds both cost (smaller quantity, possibly higher per-unit price) and time.

For contractor-supplied-and-installed R-24 batts in Saint John, installed pricing typically runs $1.80 to $3.00 per square foot depending on wall complexity, accessibility, and whether vapour barrier is included. For accurate quotes on your specific project and help navigating available rebates, connecting with insulation professionals through New Brunswick Insulation is a practical starting point.

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