You are absolutely correct, the spray foam I listed actually isn’t a soy based foam. Thank you for setting me straight on that and I apologize for not getting that right. I’m not certain how I came to that conclusion initially but I’m guessing I was due to looking at a large number of insulation websites.

In reviewing their website a little closer this time they do still provide a greener solution than traditional spray foam insulation in that they subscribe to TerraPass to offset each individual kit. They also claim to be “100% Free of CFC’s, VOC’s, Penta-BDE’s, Urea Formaldehyde”, which is excellent. For more information on why they are considered “green” please read this.

As far as the 1″ calculations, that is just a standard base measurement (a 12″ x 12″ x 1″ section is generally considered to be one square foot). Here is probably a better explaination. For your situation you would multiply that by 3.5 to get your actual r-value and total amount you’d need. The site claims that the foam won’t sag or settle.

Hopefully this answers all of your questions, but please feel free to comment again or to contact me directly at webmaster@ (THIS DOMAIN) .net.

AlsoI looked at the link to Foam-it Green and they state that their product is NOT soy-based but rather polyurethane. Were you finding soy insulation products somewhere?