Qu'est-ce que la feuille de barrière rayonnante?

Radiant barrier foil is a thin aluminum film that works to reflect heat gain. It is typically fastened to the underside of roofs or in attic spaces, where it prevents the heat absorbed by hot roofs from transferring to the home’s interior. Radiant barrier foil is especially effective in cathedral ceiling applications where there is limited attic space. La barrière radiante correctement installée bloque jusqu'à 95% de la chaleur dans une maison du toit.

Il existe plusieurs méthodes passives qui peuvent être utilisées pour réduire les coûts de refroidissement de la maison. Awnings, curtains and reflective window film keep the sun from entering the house, reducing direct heat gain. Radiant heat is the transfer of heat from a heated object to a cooler object. Roofs are capable of transferring large amounts of radiant heat into the home. L'isolation attique aide à empêcher une grande partie du transfert de cette chaleur, mais la feuille de barrière rayonnante empêche la chaleur d'atteindre l'isolation.

Radiantbarrier foil is made of aluminum foil, because of the material's unique heat-transfer properties. Aluminum foil reflects heat but does not absorb and transfer it. Radiant barrier foil reduces interior temperatures, thereby lowering air-conditioning costs by an average of 10 percent.

This lightweight film can be installed during construction or in existing homes. The foil is stapled or tacked to the underside of the roof panels. Pour profiter de ses propriétés réfléchissantes à la chaleur, une feuille de barrière rayonnante doit être installée avec le côté de la feuille réfléchissante face à l'intérieur de la maison. The radiant barrier should face an airspace, because it will act as a heat conductor if it is in contact with the ceiling.

There are several radiant barrier systems. It is available bonded to paper, with the foil on one side and paper on the other, or preinstalled on roof decking. It is also available as a double-sided, reinforced foil. Some insulation manufacturers also offer their product with such foil already attached.

Les systèmes en feuille en couches sont deux morceaux de feuille de barrière rayonnante qui sont collées en sections pour créer un espace de chicane entre les couches supérieure et inférieure de la feuille. A “chip” form of the foil — small, loose pieces of the foil — can be blown onto attic insulation. This form of radiant barrier foil, while somewhat effective, reflects less heat than the solid film varieties. The choice of radiant barrier type is dictated by attic and roof conditions.