For Electric & Natural Gas Customers
When insulating the attic, rafter vents ensure the soffit remains clear of insulation so there is a channel for outside air to move into the attic at the soffit and out through attic vents. Rafter vents are usually a lightweight preformed piece of plastic material that can be easily installed by stapling them directly to the roof decking between the rafters. Rafter vents come in 4’ lengths and 14-1/2” and 22-1/2” widths for different rafter spacing.
Once the rafter vents are in place, you can place the batts, blankets or blown insulation to the very edge of the attic floor. If you are using blown insulation, use an additional block to prevent insulation from being blown into the soffit. A piece of rigid foam board placed on the outer edge of the top plate works very well for this. Check with a qualified contractor or home improvement store to see which application will work best for your needs. Visit the ENERGY STAR® website for more information on installing rafter vents
or find a Do it Yourself Guide to Sealing and Insulating with ENERGY STAR