Rafter Insulation

Rafter insulation can be used in two places: Rooms that are above a cathedral ceiling, and in attic space where the insulation is installed beneath the attic room rather than on the attic floor.

Rafter insulation usually falls into one of these three categories:

• Fiberglass batts: Before fiberglass batts can be "friction-fit" between rafters, an insulation baffle is installed. The baffles are necessary to maintain ventilation space between the soffit and ridge vents.
• Spray Foam Insulation: This form of insulation is applied in the space between rafters. It is controversial form of insulation because it eliminates the ventilation space that allows the roof to "breathe." This insulation also creates a moisture barrier which can trap moisture inside of your home and cause roof sheathing to rot.
• Rigid Foam Insulation: This insulation is perfect for insulating rafters in cathedral ceilings. This is because the foam panels can be cut to fit between rafters, fastened to rafter bottom edges, or both. Also, unlike spray foam, an airspace beneath the roof sheathing is maintained to promote roof ventilation. Dr. Energy Saver's exclusive SuperAttic system utilizes this approach, and also includes a radiant barrier for additional energy savings.

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