Foil Bubble Insulation Under Metal Roof

Most brands of foil faced bubble wrap are only 3 8 inch thick or less and have an r value of only 1 0 or 1 1.

Foil bubble insulation under metal roof.

Foil insulation underlayment is recommended under a metal roof and in most cases the shiny side should be facing up but there s a catch. It s important to know that ecofoil bubble insulation can absolutely be used in conjuction with other forms of traditional insulation for a combination to work against all 3 types of heat transfer. Unroll the foil bubble wrap insulation over the metal joists or purloins that create the frame for the roof. A secondary method of installation instead of installing under the attic rafters is to lay the foil insulation over the attic floor.

The r value of foil faced bubble wrap is so low that it has few if any advantages over rigid foam. This is why we recommend ecofoil bubble insulation for most metal building applications. Since the product often costs more per square foot than 1 inch thick rigid foam rated at r 5 why would anyone use bubble wrap as insulation. The main one in the latter category is foil faced bubble wrap sold as insulation.

Looking at the table of insulation values bubble wrap and foil will have limited benefit on reducing heat loss. When i wrote about my trip to the southeast building conference in july i mentioned how some products on display there really annoyed me because they re either bad to the bone or overhyped. This insulation performs exactly the same as ecofoil double bubble foil insulation the white is just a cosmetic difference. Foil insulation is a radiant barrier and it works by.

There is no contained air gap inside the foil and the air gap outside the foil is fairly leaky i don t think that there will be much benefit from the insulation value of the bubble wrap. Achieved by attaching to the underside of 2 x 4 roof purlins creating a 2 enclosed air space between bubble insulation and metal exterior roof.