How Green is Soy-Based Spray Foam Insulation?

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images1.jpgNow that we’ve explored cellulose and denim cotton insulation, let’s take a look at another green option for insulation — Soy-based Spray Foam Insulation.

This soy-based product is water-blown into walls, ceilings, floors, and roof decks to provide excellent thermal protection to a home or building. The soy bean oil is produced by farms here in the United States.

It contains no harmful and irritating particulate matter or formaldehyde. It does not promote mold growth nor provide a food source for insects or rodents. It also reduces airborne noise pollution from entering a home. It is Class 1 fire rated and will char but will not sustain a flame.

It provides a structure with an air tight seal and retains its structural integrity over time, therefore providing a highly energy efficient building. R-values range from 3.6 to 50 depending on the thickness and type of soy-based product. One downside is that it isn’t a do-it-yourself project and must be professionally installed.

Sources: and Emega BioPolymers

Tag(s): Energy, Green Building, The Great Green Outdoors


3 Responses to “How Green is Soy-Based Spray Foam Insulation?”

  1. Mike on August 8th, 2009 12:44 pm

    For a roof insulation with soy foam, do we need special structure for the vapor barrier ?

  2. Michael Pace on October 31st, 2010 8:41 pm

    When exploring the different types of foam insulations keep in mind that foams that claim to be SOY BASED are actually based on polyurethane with only a SMALL AMOUNT OF SOY POLYOL. Always ask for a third party certification of any claim about recycled content or other sustainability aspect.

  3. Drew on March 31st, 2011 8:17 am

    Michael, Heatlok Soy is a pretty good brand that is made clean and won’t outgas formaldehyde, for what it’s worth.

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