Insulating an outdoor concrete patio – how much insulation?

I’ve got a plan, slab on grade, that has a walkout slider opening to a 10’x 24′ outdoor 4″ thick concrete patio. The patio is contained by  5′ frost walls… I’ve got a plan, slab on grade, that has a walkout slider opening to a 10’x 24′ outdoor 4″ thick concrete patio. The patio is contained by  5′ frost walls…Read MoreGreenBuildingAdvisor