Reflective foil insulation is a product that is useful in keeping heating and cooling costs low. As the prices of fuel oil, natural gas and other energy sources continue to grow, foil insulation becomes a more attractive option to keep heating and cooling bills to a minimum.
Foil insulation can keep your house warm regardless of the season because it reflects heat, whether it's heat from the sun or from indoor heating systems. That is, in the summertime, when the hot sun is beating down on a building, reflective foil insulation bounces the heat away from the house. Conversely, during the colder months, foil insulation keeps warm air inside, rather than letting it escape.
Heat naturally wants to move to a cooler area. This means it wants to invade your cool house in the summer, and it wants to get outside to the cold in the wintertime. Heat from the sun accounts for roughly 90 percent of the heat that is dispersed into a home in warmer months, and approximately 70 percent of the heat you generate is lost in the winter without some way to keep it in. Foil insulation does just that.
Reflective foil insulation is generally installed on the trusses or rafters that support the roof, inside the attic. It's important that the foil insulation is not exposed to direct sunlight. It can reflect a lot of heat, and if the foil isn't installed correctly it's possible that a "bowl" will be created that constantly reflects and concentrates. Working under the same principles of radio waves through a satellite dish, the concentrated heat energy can easily cause a fire.
In addition, it's recommended that the insulation foil be perforated after it's installed. This allows water vapor to escape the foil. If water vapor becomes trapped during the winter months, it can cause the foil to freeze, limiting its effectiveness.