How do I tell if my attic insulation needs replacing in a Moncton home? | Insulation IQ?

Knowing whether your attic insulation is still doing its job — or silently costing you money — comes down to a combination of visual inspection, performance clues around the home, and a basic understanding of what properly functioning insulation looks like in a New Brunswick climate.

Start with the age of the home. If your Moncton house was built before 1990 and the attic insulation has never been updated, there's a strong chance it's underperforming. Pre-1990 homes were often built with R-20 to R-28 in the attic — roughly 150 mm to 200 mm of fibreglass batts or an equivalent depth of cellulose. Modern NB Building Code requirements for new construction in Climate Zone 6 call for RSI 8.6 (approximately R-49), meaning older homes can be less than half the current standard.

Physically measuring the depth is the most direct check. Pop the attic hatch and take a look. Most blown-in insulation settles over time — cellulose especially can compress by 20 to 30% within its first decade. If you see less than 350 mm (about 14 inches) of cellulose or less than 300 mm of fibreglass batts, your attic is almost certainly below the R-49 target. Many older Moncton homes have as little as 100 mm to 150 mm, delivering only R-12 to R-20 — a significant gap.

Visible signs of deterioration are also worth noting. Old fibreglass batts often become discoloured, matted flat, or develop a grayish cast from years of airborne dust passing through them. Discolouration isn't just cosmetic — grey streaking through insulation indicates that air is moving through gaps and the fibreglass is acting as a filter rather than a thermal barrier. Cellulose that has gotten wet and dried repeatedly can clump, compact, and lose meaningful R-value in those zones.

Check for moisture damage and mould. Any staining on the underside of the roof sheathing, dark spots on rafters, or a musty smell when you open the attic hatch suggests past or ongoing moisture problems. Damp or mould-compromised insulation must be removed rather than simply topped up. Leaving contaminated insulation in place and adding fresh material on top traps spores and moisture, worsening the situation over time.

Watch for energy performance clues throughout the house. In a Moncton winter, a poorly insulated attic will cause noticeably uneven temperatures between floors — rooms on the top floor or beneath the roof line will be colder and harder to heat. Unusually high NB Power heating bills, particularly compared to similar-sized homes in the neighbourhood, often point to attic heat loss as a major contributor. Conversely, in summer, a poorly insulated attic allows solar heat gain to penetrate more readily, making the upper floor uncomfortable and overworking your air conditioning.

Ice dam formation along your eaves after snowfall is a classic symptom. When attic insulation is inadequate and there are air leaks at the attic floor, heat escapes upward, warms the roof deck, melts the snow above it, and the meltwater refreezes at the cold overhang — forming ice dams that can back up under shingles and cause interior water damage.

Old vermiculite or urea-formaldehyde foam insulation in homes built between 1950 and 1985 requires special handling. If you suspect these materials are present in your Moncton attic, do not disturb them and contact a professional for testing and remediation.

A home energy audit by a Registered Energy Advisor (available through NB Power's program) gives you a precise, objective assessment of attic insulation performance using blower door testing and thermal analysis. This audit is also the required first step to qualify for the Canada Greener Homes Grant, which can reimburse up to $5,600 toward attic insulation upgrades.

For a professional evaluation and quote in the Moncton area, New Brunswick Insulation connects homeowners with qualified local contractors who can assess your specific situation.

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Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• 3Tone Construction Ltd
• Brunswick insulation & roofing
• Gionetterenovations
• moose luxury painting
• Thirty Four Renovations