Is blown-in cellulose insulation fire-rated and safe to use in commercial buildings in New Brunswick?

Yes, blown-in cellulose insulation is fire-rated and safe for commercial use in New Brunswick when properly installed according to manufacturer specifications and NB Building Code requirements. Cellulose actually provides superior fire resistance compared to fibreglass insulation due to its borate fire retardant treatment.

Fire Rating and Safety Performance

Blown-in cellulose insulation typically achieves a Class A fire rating (the highest rating for building materials) when tested according to ASTM E84 standards. The borate fire retardants used in cellulose manufacturing — primarily boric acid and borax — create a char layer when exposed to flame that actually protects the underlying material and slows fire spread. In fire tests, cellulose-insulated wall assemblies often outperform identical assemblies with fibreglass insulation.

The borate treatment also provides natural pest resistance and helps control mould growth, making cellulose particularly suitable for commercial applications where building longevity and indoor air quality are priorities. Unlike some spray foam products, cellulose does not emit toxic gases when exposed to high temperatures, and the manufacturing process uses recycled newspaper rather than petroleum-based chemicals.

Commercial Building Code Compliance in NB

For commercial applications in New Brunswick, cellulose insulation must meet the requirements of the National Building Code of Canada (NBCC) as adopted by the province. This includes proper installation density (typically 3.5+ pounds per cubic foot for wall applications), appropriate vapour barrier systems for NB's cold climate, and integration with fire-rated assemblies where required. Commercial buildings often require specific fire ratings for wall and ceiling assemblies — cellulose can contribute to these ratings when installed as part of tested assemblies.

Installation Considerations for Commercial Projects

Commercial cellulose installation requires professional contractors with experience in commercial building systems. The installation must account for larger cavity depths, commercial-grade vapour barriers, integration with fire dampers and mechanical systems, and coordination with other trades. Dense-pack installation in commercial wall cavities requires specialized equipment to achieve the proper density throughout the full height of multi-storey walls.

Permits and Professional Requirements

Commercial insulation projects in NB typically require building permits and must be installed by contractors carrying WorkSafeNB coverage and appropriate liability insurance. The installation should be inspected as part of the overall building permit process to ensure compliance with fire ratings, thermal performance, and vapour management requirements.

For your specific commercial project, I'd recommend consulting with a commercial insulation contractor who can review the building plans, fire rating requirements, and mechanical systems integration. Need help finding commercial insulation professionals? New Brunswick Insulation can match you with contractors experienced in commercial cellulose installation through the New Brunswick Construction Network.