Roof Insulation Foil Up Or Down

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.

Roof insulation foil up or down.

The foil layer of the osb lowers the delta t because the foil is low emitting and does not emit or absorb heat. Reflective foil insulation installation on a roof is usually done in the ceiling attics or other spaces that separate the roof from the ceiling. Foil down usually mostly to help prevent excess radiation of the installers. If dust accumulates on the foil surface it will render the radiant barrier less efficient.

What is the right insulation for an attic. They should be installed with the foil side facing into the attic adjacent to an open air space. You must ensure the attic ventilation is not blocked. You will have to ensure there are good air gaps either side of the foil to get the best performance.

Kim asks on your show you said that when insulating under a floor the paper facing should face up against the flooring. 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. Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration. For clean foil it doesn t really matter which way it goes.

Shiny aluminium foil is highly reflective and it has very low radiance so the effect is very similar whichever way it is installed. The roof we are installing is aluzinc painted white. You must leave at least a 1 airspace between the bubble insulation and the fiberglass insulation below. We bought a bubble type of insulation.

I have a question about insulation under a metal roof. Does that side go up towards the metal or down towards the ceiling. 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 is a radiant barrier and it works by.

Why can t i install it the other way regardless of whether insulation is installed in a wall attic or crawlspace. One side has a reflective foil layer on it.