What is the cost of rigid foam board insulation per sheet in Saint John NB? | Insulation IQ?

Rigid foam board insulation prices in Saint John and throughout New Brunswick have remained relatively stable following the volatility of recent years, though regional supply chain factors and the local building supply market do create some variation compared to central Canadian pricing. Understanding what you should expect to pay per sheet — and what drives those price differences — helps you budget accurately and evaluate quotes.

The most commonly purchased sheet size is 4 feet by 8 feet (4x8), which is the standard format available at building supply retailers in the Saint John area. Prices vary significantly by foam type and thickness:

EPS (expanded polystyrene), the white beaded foam, is the most affordable option. A 4x8 sheet of 1-inch EPS (approximately R-4) typically retails in the $15 to $22 range in New Brunswick. Two-inch EPS (R-8) runs approximately $28 to $40 per sheet. EPS is widely available and is the go-to choice for budget-conscious basement insulation projects where vapour permeance is not a concern.

XPS (extruded polystyrene), the pink, blue, or green dense foam depending on brand, commands a premium over EPS due to its higher R-value per inch, lower vapour permeance, and better resistance to moisture absorption. A 2-inch XPS sheet (R-10) typically costs $38 to $55 per sheet at Saint John building supply retailers. The 1-inch XPS (R-5) runs approximately $20 to $32 per sheet. 3-inch XPS (R-15) is less commonly stocked and may need to be ordered; expect $65 to $85 per sheet when available.

Polyisocyanurate (polyiso), often sold with foil facers and primarily used in roofing and cathedral ceiling applications, is generally priced between the two. Two-inch polyiso (nominally R-12 to R-13) is priced similarly to 2-inch XPS or slightly higher, ranging from $40 to $60 per sheet depending on the facer type and brand. Polyiso is less commonly found in general-purpose big-box format in New Brunswick and is more typically ordered through roofing and commercial insulation suppliers.

Keep in mind that a 4x8 sheet covers 32 square feet. For a 1,000-square-foot basement wall area, you're looking at roughly 32 sheets of the primary insulation layer, not counting waste, cuts, and perimeter conditions. At $45 per sheet for 2-inch XPS, that's approximately $1,440 just in materials for one layer. Most basement projects in Saint John also include spray foam for sealing, fasteners or adhesive, and a stud wall assembly on top — total material costs for a properly insulated 1,000 sq ft basement wall area often run $3,500 to $6,500 in materials alone.

Buying in bulk or bundled quantities can reduce per-sheet costs meaningfully. Some Saint John-area suppliers offer contractor pricing or reduced rates on full pallet quantities. If you're doing a large project — a full basement plus crawlspace, or adding continuous exterior insulation to the entire house envelope — it's worth asking about volume pricing or ordering through a local insulation contractor who has wholesale accounts.

For projects where you're targeting eligibility for the NB Power Save-Smart program or the Canada Greener Homes Grant, the type and amount of foam you choose will directly affect your rebate eligibility. Greener Homes in particular requires pre- and post-retrofit EnerGuide assessments, and the insulation upgrades must meet minimum improvement thresholds. Foam board used as part of a basement insulation upgrade or as continuous exterior wall insulation is an eligible measure, and the grant covers up to $600 for basement insulation improvements and up to $5,000 for exterior wall insulation upgrades — potentially offsetting a significant portion of your material and labour costs.

For the most accurate current pricing in Saint John, contact local building supply retailers directly, as prices fluctuate with freight and demand. The professionals listed on New Brunswick Insulation can also advise on the most cost-effective material selection for your specific project scope.

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