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.
Solar radiation causes roof temperatures to reach 160 degrees to 190 degrees Fahrenheit.
Heat is conducted through roofing materials and radiated to the ceiling below.
Attic air temperatures climb to superheated levels, typically 140 degrees fahrenheit in the summer.
Ceiling insulation R-values are rated at 75 degrees and 50% relative humidity, as temperatures and humidity levels increase, R-values diminish. Radiant heat transfers into air conditioning ducts increasing energy costs. Attic structure and contents saturate and continue to transfer heat even after the sun has set.
A/C run time increases and in peak loads cannot maintain internal temperature set points - comfort is compromised.
Air quality is compromised - hot humid air is drawn through leaks in the duct system.
The Solution - Silver Shield Radiant Barrier
Reduces radiant heat transfer up to 97%. Treats the problem at its source - the roof.
A/C savings up to 12%. Significantly reduces attic temperatures up to 30 degrees.
Increases insulation and air conditioning duct efficiency.
Lowers temperatures and improves comfort in areas that are not typically air conditioned, such as garages and lanais.
Qualifies for Florida Energy Code Credits.
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.
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