Preview - Blown Insulation for Attics: Fiberglass vs. Cellulose - Fine Homebuilding Article
previous
  • All about Roofing
    All about Roofing
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • Remodeling Articles
    Remodeling Articles
  • Deck Design & Construction
    Deck Design & Construction
  • Master Carpenter Videos
    Master Carpenter Videos
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • Magazine Departments
    Magazine Departments
  • Design Inspiration
    Design Inspiration
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • Ultimate Deck Build 2015
    Ultimate Deck Build 2015
  • Energy-Smart Details
    Energy-Smart Details
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Video Series: Tile a Bathroom
    Video Series: Tile a Bathroom
  • 9 Concrete Countertop Ideas
    9 Concrete Countertop Ideas
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • Install a Vinyl Privacy Fence
    Install a Vinyl Privacy Fence
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
next
Pin It

Blown Insulation for Attics: Fiberglass vs. Cellulose

Both perform better than batts and are less expensive than spray polyurethane. Neither is perfect.

When you are preparing to insulate an attic, the traditional choice of fiberglass batts might not be the best option. Blown insulation performs better than batts, and it is less expensive than spray polyurethane. Contributing editor Martin Holladay compares and contrasts two types of blown insulation, fiberglass and cellulose. Loose-fill fiberglass has a low R-value (2 to 2.7) per inch, so it is best applied in attics that have enough room to accommodate insulation 16 in. to 26 in. deep. Blown-in cellulose is made of ground-up newspaper mixed with a borate-based fire retardant. Because it is denser than fiberglass, it is more effective at reducing air leakage. Cellulose has an R-value of about 3.2 per in. Cellulose can be problematic if it becomes wet. Because it can absorb a lot of water, leaks can cause severe water damage before homeowners become aware of them via damaged drywall.

Blown Insulation for Attics: Fiberglass vs. Cellulose
Plus get a free gift
Become a Fine Homebuilding Member. Start your free trial now
Next Article
Next Article: Online Membership Required