How To Insulate Your Attic Rafters

Move across the attic until you ve hit your desired height at every point.

How to insulate your attic rafters. Don t be duped into thinking other types of insulation will give you a tight air seal. Hire a pro to install spray foam insulation. And it keeps the cold or hot outside air outside. 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.

Fill every joist space completely and evenly with the insulation leaving attic vents uncovered. Typically you will fill the insulation blower with the insulation and blow it between the attic floor joists. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material was installed. Blow in insulation until the hopper is empty.

Plus spraying the rafters also uses more spray foam it s a larger surface area. You get a seamless air barrier and high r value even in just 1 inch. 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. 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.

That air seal means you keep the air you heated or cooled inside your home. Then blow another layer on top of the roof rafters. How to install rafter insulation. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with.

2d extend insulation into joist space to reduce air flows. Then pivot in place and do the same thing to the other side. Use 3 8 inch heavy duty staples every six inches. You can use rigid foam panels or do as tom silva does with nearly all houses these days.

Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. If you do need to do your rafters use closed cell foam it green. For the center areas hold the hose level and blow in insulation evenly until you ve reached your level lines photo 6. Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass.

Level uneven spots with a rake. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.