How To Insulate Your Attic Rafters

2d extend insulation into joist space to reduce air flows.

How to insulate your attic rafters.

Blow in insulation until the hopper is empty. In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. 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.

If your attic is going to be converted into livable space then you will need to insulate the roof rafters. Then pivot in place and do the same thing to the other side. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. That air seal means you keep the air you heated or cooled inside your home.

Make sure the paper flange and the staples lie flat against the board to create an even surface for attaching the finished wall material. Move across the attic until you ve hit your desired height at every point. Hire a pro to install spray foam insulation. Then blow another layer on top of the roof rafters.

Fill every joist space completely and evenly with the insulation leaving attic vents uncovered. Don t be duped into thinking other types of insulation will give you a tight air seal. Use 3 8 inch heavy duty staples every six inches. And it keeps the cold or hot outside air outside.

Typically you will fill the insulation blower with the insulation and blow it between the attic floor joists. Level uneven spots with a rake. Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed.

Plus spraying the rafters also uses more spray foam it s a larger surface area. 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. If you do need to do your rafters use closed cell foam it green. How to install rafter insulation.

For the center areas hold the hose level and blow in insulation evenly until you ve reached your level lines photo 6. 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.