Roof Insulation Foil Up Or Down

You must ensure the attic ventilation is not blocked.

Roof insulation foil up or down.

In the above states you can staple the foil double bubble insulation directly to the roof decking instead of installing to the underside of the rafters as indicated above. The foil layer of the osb lowers the delta t because the foil is low emitting and does not emit or absorb heat. 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. The roof we are installing is aluzinc painted white.

They should be installed with the foil side facing into the attic adjacent to an open air space. If dust accumulates on the foil surface it will render the radiant barrier less efficient. Reflective foil insulation installation on a roof is usually done in the ceiling attics or other spaces that separate the roof from the ceiling. I have a question about insulation under a metal roof.

What is the right insulation for an attic. Does that side go up towards the metal or down towards the ceiling. Shiny aluminium foil is highly reflective and it has very low radiance so the effect is very similar whichever way it is installed. We bought a bubble type of insulation.

Why can t i install it the other way regardless of whether insulation is installed in a wall attic or crawlspace. Foil insulation is a radiant barrier and it works by. So when the sun hits the roof and radiates into the attic or wall the foil layer of the osb sheathing reflects the heat to the roof or exterior wall which keeps the top layer of the insulation just a few degrees warmer than the outside air temperature. You must leave at least a 1 airspace between the bubble insulation and the fiberglass insulation below.

The paper facing should always face toward the inside of the home. Due to the varying nature of the construction of buildings each property may require a slightly different approach when installing insulation on the roof. For clean foil it doesn t really matter which way it goes. Foil down usually mostly to help prevent excess radiation of the installers.

One side has a reflective foil layer on it. Kim asks on your show you said that when insulating under a floor the paper facing should face up against the flooring.