Up next came insulation. I opted for environmentally friendly, incredibly efficient spray foam. it is made partially of soy products and seals even the smallest areas, so it stays warm in the winter and cool in the summer. All interior walls and ceilings were covered with 4-8 inches, and the entire underside of the studio space was covered with another 8 inches. I saved all the scraps to build into bass traps, gobos and diffusors. These photos were taken in October 2010.