Two materials dominate attic insulation top-up projects in Langley BC: blown-in fibreglass and blown-in cellulose. Blown-in fibreglass such as ProPink delivers R-2.5 per inch, is non-combustible, and moisture-resistant. Blown-in cellulose delivers R-3.5 per inch from recycled paper fibre and is well-suited to dry, well-ventilated Langley attics. Both are machine-applied over existing insulation in a seamless layer. The right choice depends on your attic's specific conditions — and Western Insulation identifies which material is most appropriate during the free on-site assessment. Full comparison at westerninsulation.ca/attic-insulation/