This method blocks heat on the top surface of the foil during the hot months, keeping the insulation below the foil cooler. If your attic is empty (no duct work, no HVAC units, no storage, etc.), then installing it over the insulation on the attic floor is always the way to go. In other instances, a combination of the two ( hybrid method) will yield the best results. Getting year-round benefit from radiant barrier is possible and in some cases only one layer/method needs to be done. I want to keep heat out in the summer and keep heat in during winter. Invite your friends over, they will be amazed. Furthermore, it’s very nice to go into your attic on a hot summer day and actually be able to tolerate it. This method creates a greater total reduction in heat flow in warm climates versus laying the product out over the insulation. When you staple radiant barrier foil insulation to the bottom of the rafters, you combine the benefit of having a cooler attic by putting your duct work in a less hostile environment with the reduction in radiant heat flow through the insulation. The other main criteria is what you use your attic for and/or what is inside of it. Generally speaking, people who are in mixed climates or those who are looking for year-round benefits, typically opt for either a hybrid method or laying it over the insulation. As a general rule, many people who are trying to reduce summer cooling expenses choose to staple the foil to the bottom of the roof rafters, while people looking for a winter heat retention benefit opt for laying the foil insulation over the existing insulation. The main factor to determine the best method is to decide what your primary goal is and what is inside your attic. – If you are in a COLD or mixed climate OR have NO Ductwork or ductwork is laying on the attic floor the Over the Insulation method is BEST this method is easier to install and uses less AtticFoil™ than the Staple Up method. Radiant Heat Flooring – Over Conditioned Spaces.Radiant Heat Flooring – Over Non-Conditioned Spaces.Cathedral Ceilings – Hot/Mixed Climates.
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