Should i go with mineral wool or fiberglass batt insulation for my exterior wall upgrade in a Moncton home?

For a Moncton exterior wall upgrade, mineral wool is generally the better choice, offering superior fire resistance, moisture management, and sound dampening compared to fiberglass batts. However, your decision should factor in budget, installation method, and your home's specific challenges.

Mineral wool advantages are particularly valuable in Moncton's climate. It maintains its R-value even when slightly damp (common during spring thaw and coastal moisture), provides excellent fire protection (melting point around 1000°C vs. fiberglass at 400°C), and significantly reduces sound transmission - helpful if you're near busy streets like Mountain Road or Wheeler Boulevard. Mineral wool also doesn't settle over time like some fiberglass products can.

Cost comparison in the Moncton market runs roughly $1.20-$1.80 per square foot for mineral wool versus $0.80-$1.20 for quality fiberglass batts. For a typical 1,200 sq ft exterior wall area, expect $300-$600 more for mineral wool - but this premium often pays back through better long-term performance and energy savings.

Installation considerations matter significantly. Mineral wool cuts cleanly with a knife and friction-fits tightly without compression, making it excellent for DIY installation. Fiberglass requires more careful handling to avoid compression (which reduces R-value) and can be itchy to work with. Both require proper vapor barrier installation on the warm side of the wall.

For Moncton's building requirements, you'll need a building permit from the City of Moncton Planning & Development department (506-856-4375) for exterior wall modifications. The work must meet NBC 2020 standards - if your project starts after May 1, 2025, you'll need to meet the new Tier 2 energy requirements with higher insulation values.

Professional recommendation: If your walls currently have vermiculite insulation (common in post-war Moncton homes), hire a certified abatement contractor before proceeding - vermiculite may contain asbestos. For complex installations involving electrical or plumbing modifications, work with licensed trades (TIS licensing: 1-888-659-3222).

Start by getting quotes from insulation contractors in our directory who can assess your specific wall assembly and recommend the optimal R-value for your upgrade.