Greenfiber®

The Greenfiber® lineup delivers high-performance insulation for any project—bringing peace, quiet, and comfort to homes, supporting healthier living for families, and providing trusted results contractors and homeowners can count on. 

SANCTUARY® by Greenfiber® is the only major insulation product that is proven to actually reduce global warming potential because it’s made with recycled fibers from trees that lock in carbon for the life of the product. Most insulation materials have significant carbon impacts due to energy-intensive manufacturing, long-distance transportation and high levels of VOCs. Greenfiber cellulose insulation is made with recycled materials and requires less energy to produce, helping reduce its overall carbon footprint. In 2026, we will remove 330,000 tons of CO₂ from the air. Couple this with low-energy manufacturing and short-haul transportation, and it’s clear why cellulose insulation is the responsible, sustainable choice for homeowners and the planet. 

SANCTUARY by Greenfiber is an all-in-one cellulose insulation that can be blow-in, spray-applied, or dense-packed. It can be easily installed over existing insulation and unlike batt or roll alternatives, it’s engineered to fill every gap, void, and hard-to-reach space, forming a dense barrier that reduces air infiltration to boost thermal performance and reduce sound. Made with 85% recycled materials, free from harmful additives, SANCTUARY supports healthier living and a greener planet while meeting modern building codes and delivering lasting value for your home. 

From top to bottom, SANCTUARY adapts to every part of the building envelope — filling gaps, corners and hard-to-reach spaces where other insulation can’t. Its dense structure forms a barrier that reduces air infiltration, boosting thermal and sound performance.  

SANCTUARY fills wall cavities completely without gaps or seams, creating a continuous seal that improves insulation, reduces noise and meets building codes. When installed in floors, SANCTUARY forms a barrier between levels that stops drafts, balances room temperatures, controls moisture, reduces sound and boosts overall energy efficiency. SANCTUARY also fills air gaps in attics to prevent heat loss in winter and block heat in summer, resulting in consistent comfort, better energy use and cleaner indoor air year-round and adds a protective layer in ceilings to reduce heat transfer and temperature. Easy to install and trusted by professionals, SANCTUARY delivers comfort where it counts.