Feature	Cellulose   (dense pack)	Fiberglass (batt)	Spray Foam  (open cell)	Notes
R-Value per inch	3.8	2.1-3.2	3.6
100% Green	YES	NO	NO	(‡ foot note)
Recycled Content	Over 82%	<5%	None
Install w/o gaps, voids	YES	NO	NO	Fiberglass has gaps, Foam has voids in bulk installations
High Performance	YES	NO	YES	Sops air infiltration, fills voids and gaps.
Stops Air Infiltration	YES	NO	YES
Off Gases	NO	YES	YES	Fiberglass - formaldehyde, Icynene - isocyanates
Fireproof Class "A" Rated	YES	NO	NO	Cellulose has no burn rate, no smoke when exposed to flame
Fill Gaps and Voids	YES	NO	YES
Low Embodied Energy	YES	NO	NO	Manufacturing energy costs. Cellulose is less than 1% of fiberglass or foam.
Potentially Hazardous	NO	YES	NO	Fiberglass contains formaldehyde, arsenic and other irritants
Hygroscopic†	YES	NO	NO	Absorbs and wicks moisture away from other building materials.
Easy to Remove	YES	YES	NO
Settles/Sags	NO	NO	NO	(* foot note)
Closed Cavity Install	YES	NO	YES	Foam products require numerous install penetrations.
Vermin Proof	YES	NO	NO
Insect Proof	YES	NO	NO
Mold/Fungus Proof	YES	NO	NO
Perfect Fit	YES	NO	YES	5% gappage will increase energy usage by 52%
Easy to retrofit (wiring/plumbing)	YES	YES	NO
Distorts Jambs/Framing	NO	NO	YES	Expanding foams force on areas of installation.
Zero Waste Factor	YES	NO	NO
Stops Convection	YES	NO	YES	Convection is the heat transfer by movement of air
*Dense Pack Cellulose installation typical in walls and ceilings cannot settle because it is installed under pressure to a high compaction factor typically 3.5 lb/cf. Loose Fill cellulose typically installed on attic floors will experience a small degree a settlement however this in NO way reduces the total R-Value or performance of the cellulose.     **Foam insulation in retrofit cavity fill applications typically require more frequent penetrations to achieve the same coverage as Cellulose.     †Hygroscopic: Materials that absorb and transmit moisture. This is advantageous for insulation that stops airborne     ‡A "Green" building material may have any of the following attributes: contributes to high energy efficiency, recycled, renewable, organic, devoid of synthetic additives, or locally produced. Only Cellulose has ALL of these "Green" attributes.