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.

They should be installed with the foil side facing into the attic adjacent to an open air space. You will have to ensure there are good air gaps either side of the foil to get the best performance. One side has a reflective foil layer on it. If dust accumulates on the foil surface it will render the radiant barrier less efficient.

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. We bought a bubble type of insulation. For clean foil it doesn t really matter which way it goes. Reflective foil insulation installation on a roof is usually done in the ceiling attics or other spaces that separate the roof from the ceiling.

The paper facing should always face toward the inside of the home. The foil layer of the osb lowers the delta t because the foil is low emitting and does not emit or absorb heat. 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.

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

Due to the varying nature of the construction of buildings each property may require a slightly different approach when installing insulation on the roof. Why can t i install it the other way regardless of whether insulation is installed in a wall attic or crawlspace. You must leave at least a 1 airspace between the bubble insulation and the fiberglass insulation below. You must ensure the attic ventilation is not blocked.

Foil insulation is a radiant barrier and it works by. Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.