Create a Sanctuary
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.
Why Cellulose?
See how SANCTUARY® by Greenfiber goes beyond traditional insulation—filling gaps, improving comfort, reducing noise, and adding fire protection to create quieter, more energy-efficient homes.
Benefits of Cellulose Insulation
Insulation that Delivers
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Optimizes Acoustics
Reduces sound power by 60% for a quieter and more peaceful home.1
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Elevates Comfort & Efficiency
Lowers heating and cooling costs by up to 25% and regulates temperatures from room to room.2
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Powers Sustainability
Made with 85% recycled content and delivers a lower carbon footprint.
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Resists Fire
Proven to stand up to fire with permanent fire retardants that last the life of the home.3
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Installs Easily
Fills joints, cracks and crevices for a perfect install every time.
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Testimonials
Real customers. Real results.
See how Greenfiber cellulose insulation is helping contractors, builders, architects and homeowners create quieter, more efficient and more sustainable spaces.
Featured Products
Solutions For Any Project
SANCTUARY
An eco-friendly cellulose insulation product that delivers unparalleled sound power reduction, highly effective insulation, temperature regulation and fire safety.
SANCTUARY DEFENSE
An eco-friendly, high-performance insulation that delivers everything SANCTUARY® does, but with added protection against 25 home-destroying pests.
FRM Insulation
Combined with our proprietary U370 firewall design, this formula achieves a 2-hour fire resistance rating, plus exceptional reduction in air infiltration and sound control.
Contact Us
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.
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.