Can you tell me anything regarding the radiant barrier use under concrete? Some of your members manufacture under concrete insulation in varying forms – some with a radiant barrier some without. Some say you can’t install a radiant barrier under concrete – some say you can. Aside from installing it correctly so the aluminum is not destroyed by the concrete — does a radiant layer still work under concrete?
The answer is no — a radiant barrier installed under a concrete slab will not be able to function as a radiant barrier. Radiant barriers need air space in order to reflect heat and there would not be an air space under the slab.