Against the rafters (Greenlows way)
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Installed on the attic floor
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| Foil is installed ABOVE ductwork and AC putting them in a much cooler environment |
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Foil is installed below ductwork and AC making ventilation crucial because ductwork and AC exist in a hotter environment |
| You actually get two radiant barriers because the foil facing below and above both have an airspace. This helps dust accumulation because you have two chances to reflect the heat. |
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You get one side that faces an airspace and one chance to block the heat |
| You can add insulation to your attic in the future |
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You must remove/add/reinstall barrier to add insulation in the future. |
| Dust accumulation takes MUCH longer to affect the foil since its suspended in the air with two sides facing an airspace. |
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Dust accumulation is much faster because of the foil laying flat on the attic floor where dust falls and only one side facing an airspace. |
| Radiant heat is most effectively reflected at a perpendicular angle. This installation method acheives that. |
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The angle created is not perpendicular. |
