How do I know if an insulation contractor in Saint John is quoting work that actually meets New Brunswick building code requirements?

Great question — many NB homeowners get quotes that sound impressive but don't actually meet current building code requirements, especially for R-values and air sealing standards.

The New Brunswick Building Code requires specific minimum R-values that many contractors either don't know or choose to ignore to keep their quotes competitive. For new construction and major renovations, you need R-50 minimum in attics (R-60 recommended), R-22 to R-28 effective for above-grade walls, and R-17 to R-20 for below-grade basement walls. Many Saint John contractors still quote outdated standards like R-40 attics or R-20 walls because that's what they've always done.

Here's how to verify your quotes meet code:

Ask for specific R-values in writing — not just "we'll insulate your attic" but "we will install blown-in cellulose to achieve R-50 continuous coverage." If they quote R-40 or less for an attic, they're not meeting current code. For walls, make sure they understand the difference between cavity R-value (the batt between studs) and effective whole-wall R-value. A 2x6 wall with R-22 batts only achieves about R-16 effective due to thermal bridging through the studs — true R-22+ requires continuous exterior insulation.

Verify they understand vapour barrier requirements for New Brunswick's Climate Zone 6. The vapour barrier must be on the warm (interior) side of the insulation assembly. Any contractor suggesting vapour barriers on both sides of a wall, or placing them on the exterior side, doesn't understand NB building science and will create moisture problems that cost thousands to fix.

Ask about air sealing specifically — this is where many quotes fall short. The current code requires new construction to achieve 3.5 ACH50 (air changes per hour at 50 pascals pressure) or better. For retrofits, a good contractor should discuss sealing attic penetrations, rim joists, and other air leakage points before installing insulation. If they only mention insulation without air sealing, they're missing 30-50% of the energy benefit.

Request details on ventilation — especially for attic work. Code requires balanced soffit-to-ridge ventilation (1 square foot of net free area per 300 square feet of attic floor). Many Saint John contractors blow insulation right over soffit vents, eliminating ventilation and creating moisture problems. Proper installation requires ventilation baffles at every soffit bay.

For basement insulation, verify they're using appropriate materials. Closed-cell spray foam or XPS rigid foam are code-compliant for below-grade applications in NB. Open-cell foam and polyiso absorb moisture and shouldn't be used against foundation walls. Many contractors use cheaper materials that don't meet moisture resistance requirements.

Check their permit knowledge — while most residential insulation doesn't require permits in Saint John, contractors should know when permits ARE required (structural changes, commercial work, major renovations). A contractor who doesn't understand permit requirements may not understand code requirements either.

Ask for references from recent EnerGuide evaluations — contractors doing quality work should have customers who've completed NB Power or Greener Homes Grant rebate programs. These programs require professional energy advisor verification that the work meets performance standards. If they can't provide references from rebate-eligible projects, that's a red flag.

Red flags that indicate non-compliant work: Quotes significantly below market rate (quality insulation work costs $2-6 per square foot depending on type), reluctance to provide written R-value specifications, suggesting you don't need vapour barriers in NB, proposing to insulate over existing moisture problems without addressing them first, or claiming building codes are "just suggestions."

Get at least three written quotes with specific R-values, materials, and installation methods. Saint John has excellent insulation contractors who understand current code requirements, but prices vary 30-50% for identical scope. The cheapest quote is rarely code-compliant work.

Need help finding professional insulation contractors in Saint John who understand current NB building code requirements? New Brunswick Insulation can match you with local professionals for free estimates on code-compliant insulation upgrades.