Difference Between
Spray Foam Insulation & Cellulose

Closed-cell polyurethane spray foam insulation is a much more dense type of foam than open cell. It has a smaller, more compact cell structure. It is a very good air barrier as well as a water vapor barrier. It is often used in roofing projects or other outdoor applications, but can be used anywhere in the home.

Closed-cell foam has the highest R-value rating of all insulation material.
It is one of the most advanced Insulation and building envelope systems on the market today.

Open-cell polyurethane spray foam insulation is a type of foam where the tiny cells are not completely closed. Open cell is less expensive because it uses less chemicals. It is a very good air barrier but does not provide any type of water vapor barrier. It is much more sponge like in appearance. It is often used for interior walls because it provides sound reduction by damping the movement of rockwall. It is not recommended for outdoor applications.

Cellulose insulation is best used for existing attics & for dense packing sidewalls. It is the most environmentally friendly insulation available. Made out of recycled materials, cellulose insulation does not use noxious chemicals in its production or installation. Cellulose insulation is also one of the most affordable and energy efficient insulation technologies on the market. Cellulose averages up to 32% savings over fiberglass, and it is cheap to produce and transport.

While cellulose insulation costs less, closed cell spray foam provides a
superior seal & will save you more energy in less time.

Credit: http://www.Wikipedia.org
Credit: http://spf.bayermaterialscience.com