How To Insulate Your Attic Rafters

If you do need to do your rafters use closed cell foam it green.

How to insulate your attic rafters.

Plus spraying the rafters also uses more spray foam it s a larger surface area. How to install rafter insulation. Hire a pro to install spray foam insulation. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.

Typically you will fill the insulation blower with the insulation and blow it between the attic floor joists. Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. You get a seamless air barrier and high r value even in just 1 inch.

For the center areas hold the hose level and blow in insulation evenly until you ve reached your level lines photo 6. Level uneven spots with a rake. 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. Don t be duped into thinking other types of insulation will give you a tight air seal.

That air seal means you keep the air you heated or cooled inside your home. 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. 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. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

Use 3 8 inch heavy duty staples every six inches. Blow in insulation until the hopper is empty. 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.

Then blow another layer on top of the roof rafters. 2d extend insulation into joist space to reduce air flows. And it keeps the cold or hot outside air outside. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed.

Fill every joist space completely and evenly with the insulation leaving attic vents uncovered. Then pivot in place and do the same thing to the other side.