How do I vet a rigid foam board insulation contractor in Bathurst before signing a contract?

Before signing any contract for rigid foam board insulation in Bathurst, you need to verify insurance, WorkSafeNB coverage, references, and technical competence — in that order. A contractor who installs rigid foam incorrectly in Northern NB's climate can create hidden moisture problems that cost far more to fix than the original job.

Start With the Non-Negotiables

The first thing to ask any contractor is whether they carry general liability insurance (minimum $2 million is standard for residential insulation work) and WorkSafeNB coverage. Ask for certificates of insurance — not just a verbal yes. A legitimate contractor will hand these over without hesitation. If there's any reluctance or excuses, walk away. Bathurst sits in one of the coldest parts of New Brunswick, accumulating over 5,200 heating degree days per year, and rigid foam work on foundations and exterior walls involves real risk if something goes wrong — you want to know you're protected.

WorkSafeNB coverage protects you as a homeowner if a worker is injured on your property. Without it, you could be held liable. This is not optional.

Evaluate Technical Competence Before You Talk Price

Rigid foam board insulation sounds straightforward, but in Northern NB's climate it involves real building science decisions that separate a knowledgeable contractor from someone who just cuts foam and glues it to walls. When you're interviewing contractors, ask these specific questions and listen carefully to the answers.

Ask where they plan to install the vapour barrier. In NB's Climate Zone 6, the vapour barrier must be on the warm interior side of the assembly. If a contractor is installing XPS on your basement walls, the foam itself acts as the vapour retarder — there should be no poly sheeting between the foam and the concrete. If they're adding rigid foam to the exterior of your above-grade walls, the vapour barrier stays on the interior. A contractor who gets confused by this question, or gives you a vague answer, is telling you something important.

Ask what type of foam they're specifying and why. For below-grade foundation walls — extremely common in Bathurst renovations — the correct answer is XPS (extruded polystyrene, the pink or blue board) at R-5 per inch, because it maintains its R-value when exposed to soil moisture. Polyiso (foil-faced board) is the wrong answer for below-grade or exterior applications in Bathurst's cold winters — its R-value drops significantly below -10°C, which is a temperature Bathurst sees regularly from December through February. A contractor who proposes polyiso for your foundation or exterior walls without acknowledging this limitation doesn't understand the material.

Ask how they handle thermal bridging at the rim joist. The rim joist — where your floor framing meets the foundation wall — is one of the biggest heat loss points in any NB home. A thorough contractor will address it as part of the scope, typically with two inches of closed-cell spray foam rather than rigid foam (spray foam conforms to the irregular framing better). If they plan to skip it or stuff a loose batt in there, that's a red flag.

References and Past Work

Ask for three references from Bathurst or the surrounding Chaleur region — not Moncton or Fredericton. Northern NB's climate and soil conditions are different, and you want a contractor with local experience. Call those references and ask specifically: Did the basement stay dry after insulation? Any condensation or moisture issues in the first winter? Did the contractor explain the vapour management approach before starting?

If the contractor has done any work on homes that have since had an EnerGuide evaluation, ask if they can share the post-retrofit results. This is the most objective measure of whether the work actually performed.

What the Contract Should Include

Before signing, make sure the written contract specifies the foam type (XPS, EPS, or polyiso), thickness in inches, R-value per inch and total R-value, coverage area in square feet, how joints and seams will be sealed (acoustic sealant or spray foam at edges is standard), and how the assembly will be finished (framing, drywall, fire protection). Rigid foam exposed to interior living space must be covered with a thermal barrier — typically 12mm drywall — per the NB Building Code. Make sure this is in the scope.

Get at least three quotes for the same written scope. Rigid foam insulation prices in Bathurst vary considerably — expect $1.50 to $4.00 per square foot for EPS or XPS installed, depending on thickness and application. A quote that's dramatically lower than the others usually means something is missing from the scope.

If you need help finding insulation contractors serving the Bathurst area, New Brunswick Insulation can match you for free — or you can browse the directory at newbrunswickconstructionnetwork.com/directory?category=insulation.