Gaco Western. HFC-blown WallFoam 184 BIO spray-foam insulation is derived from naturally renewable oils, post-consumer recycled plastics, and pre-consumer recycled materials. The Class I fire-rated foam offers an average R-value of 6.2 per inch, the firm says, and can reduce a home’s carbon footprint by up to 13% a year, the company claims. 877.699.4226.