Roof Insulation Foil Up Or Down

Kim asks on your show you said that when insulating under a floor the paper facing should face up against the flooring.

Roof insulation foil up or down.

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. Foil down usually mostly to help prevent excess radiation of the installers. Foil insulation is a radiant barrier and it works by. 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.

Why can t i install it the other way regardless of whether insulation is installed in a wall attic or crawlspace. The paper facing should always face toward the inside of the home. 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.

For clean foil it doesn t really matter which way it goes. You must ensure the attic ventilation is not blocked. Foil insulation is worth considering if you have restricted space in your loft or roof space that means regular insulation is not viable. The roof we are installing is aluzinc painted white.

You will have to ensure there are good air gaps either side of the foil to get the best performance. Shiny aluminium foil is highly reflective and it has very low radiance so the effect is very similar whichever way it is installed. What is the right insulation for an attic. Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.

Due to the varying nature of the construction of buildings each property may require a slightly different approach when installing insulation on the 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. Reflective foil insulation installation on a roof is usually done in the ceiling attics or other spaces that separate the roof from the ceiling. We bought a bubble type of insulation.

I have a question about insulation under a metal roof. The foil layer of the osb lowers the delta t because the foil is low emitting and does not emit or absorb heat.