The depth of insulation is two ft - it was blown in. I also insulated the garage doorways with styrofoam panels received at copyright (You can find a particular kit for this). Beforehand, the garage and lani were not insulated. The US dept of energy has a Resource you are https://stephenrgugq.blogcudinti.com/35059545/the-fact-about-solar-company-that-no-one-is-suggesting