Builders
Insulation with Impact
Build faster, better and stronger with SANCTUARY® by Greenfiber® cellulose insulation. Blown in for quick installs, it fills every cavity, delivering high R-values, superior air sealing and sound reduction. Cut labor and material costs, meet stricter energy codes and offer buyers a sustainable choice made from up to 85% recycled content — all backed by North America’s largest cellulose producer.
Videos
See How It Works
From loose-filled to dense-packed and spray-applied, these videos give you the confidence needed to install Greenfiber quickly and accurately. No guesswork. No callbacks.
Power every project with knowledge
Access all the technical details, building code support and installation know-how you need to insulate with confidence — and meet today’s building standards with ease.
Superior Performance. Sustainable Choice.
SANCTUARY® by Greenfiber® transforms homes with cellulose insulation that fills every gap, joint, and crevice. Proven to withstand fire with permanent fire retardants that last the life of the home, it’s carbon-negative and made from 85% recycled paper. Beyond eco-friendly benefits, SANCTUARY reduces noise, boosts energy efficiency, and meets modern building codes — the smarter way to insulate.
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Need specs, support or solutions?
Our team of insulation experts is ready to help with product info, project advice or anything else you need to get the job done right.
Insulation Calculator
Get an accurate estimate of how much SANCTUARY® product you need for your next project.
Energy Savings Calculator
Calculate the long-term value of upgrading your insulation with SANCTUARY.
Where to Buy
SANCTUARY® by Greenfiber is available at trusted retailers and distributors near you. Use our locator to get started.
Find a Sales Representative
Our knowledgeable sales representatives are ready to guide you through product details, answer your questions and help you find the best solutions for your project.
Find a Trusted Installer
Find experienced, trusted professionals who know how to install SANCTUARY® cellulose insulation for maximum comfort, performance and peace of mind.