Re: Wall and ceiling insulation?
Air gaps are a farce, as is the little bit of tin foil. That tin foil is a marketing stunt that really has no effect.
The link provided above is for buildings with vented roofs. Our buses need to be SEALED, as they have no venting in their roof. The technology they are trying to push is the tin foil will block the radiant heat from the sun above. However, once the heat is in the building, it must be vented. Better would be to skip the reflex insulation. and to the spray foam the underside of the tin. With the spray foam directly adhered to the tin, the radiant heat from the sun is never allowed to enter the space. Also the spray foam eliminates the condensation buildup that will form on the underside of the tin roof, just behind the reflex insulation.
If you leave a air gap, and cold air get's into that air chamber, that chamber becomes a cold zone. All insulation to the outside of that air gap you left will be rendered useless.
As a builder, I have made this mistake. It cost me thousands when I had to tear apart the house and re insulate with spray foam.
AIR GAPS DEFEAT THE PURPOSE OF INSULATING.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization