Attics
Sanctuary for Built-In Well-Being
Elevate every project with SANCTUARY® by Greenfiber®, the insulation solution for quieter, more comfortable, high-performance homes.
Why Cellulose
Built for performance. Backed by sustainability.
Applications
Versatile Insulation for Every Application
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. Easy to install and trusted by professionals, it delivers comfort where it counts.
Our Products
Featured Products
From sound control and energy savings to fire resistance and pest defense, the SANCTUARY lineup delivers high-performance solutions for every space — backed by smart design and proven results.
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.
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.
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.
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.
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.
Where to Buy
SANCTUARY® by Greenfiber is available at trusted retailers and distributors near you. Use our locator to get started.
Request Tech Info
Looking for technical documents or safety data? Select the product from the list below, and we’ll send you what you need.
Documents
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.
