Fi-Foil

An attic offers excellent potential for use of radiant barrier systems: First, because the roof is the surface most exposed to solar radiation, and second, because most of the solar gain absorbed by the roof is transmitted down to the attic floor by radiation. Since the attic airspace separates the hot roof surface from the ceiling, no heat will move down by conduction, and the heat will not convect down from the hot roof to the ceiling because heated air rises. If you place a radiant barrier (layer of foil) in the airspace between the hot roof deck and the cooler attic floor (insulation), you can eliminate almost all radiant heat transfer.

1. Reduces radiant heat transfer up to 97%. Treats the problem at its source the roof.
2. A/C savings up to 12%. Significantly reduces attic temperatures up to 30 degrees.
3. Increases insulation and air conditioning duct efficiency.
4. Lowers temperatures and improves comfort in areas that are not typically air conditioned, such as garages and lanais.
5. Qualifies for energy star code.
6. Energy Star Rating helps to qualify for energy efficient mortgages.

Of the three methods, installing a radiant barrier to the bottom of the top cord is the most effective for reducing radiant heat transfer. This installation method yields a 15% to 20% performance improvement. In addition, the top cord installation method reduces material costs especially in hip roof configurations.