How To Install Insulation In Attic Rafters

Staple sheets of 6 mil plastic over unfaced insulation to create a vapor barrier.

How to install insulation in attic rafters.

If your house doesn t already have a layer of insulation between the joists you ll need to install one before adding a layer over the joists. Measure the length and width between two rafters in your attic and transfer the measurements to a 4 ft by 8 ft of rigid foam insulation board. Replace the floorboards and then spray more insulation on top of it. Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor.

Start in a corner away from the attic hatch and fit the roll insulation between the joists facing against the drywall. Staple it to the rafters or scabbed on boards with a staple gun so that the paper backing is toward the interior of the room to act as a vapor barrier. Use 3 8 inch heavy duty staples every six inches. Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass.

Find a pre screened local home insulation contractor. If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards. Staple through the plastic and into rafters. Fill every joist space completely and evenly with the insulation leaving attic vents uncovered.

Level uneven spots with a rake. With a helper to load the blower with insulation as needed start at the perimeter of the attic and work toward the attic access door. 2 snap a chalk line between the length measurements. Once they are in place you can then place the batts or blankets or blow insulation right out to the very edge of the attic floor.