How To Insulate Under Roof Plywood

Roll out the fiberglass insulation sheets between the joists facing side up making sure it is snugly in place.

How to insulate under roof plywood.

With a warm roof the usual process is to split the insulation into two layers. Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. Clean the plywood by vacuuming away dust and debris or by wiping it with a tack cloth. Open cell spray polyurethane foam or closed cell spray polyurethane foam ccspf insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones see figure 1.

Cut panels on roof. Lay the foam insulation face down. How to insulate plywood 1. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement.

Transfer the measurements onto sheets of rigid foam insulation. 2 snap a chalk line between the length measurements. Cut styrofoam insulation to the correct size and layer it below the fiberglass already in place. Nail or staple the furring strips between the joists to hold the styrofoam in place.

Appreciate this extremely helpful blog. Leave gaps between panels. 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. Don t wet the plywood as it s.

Before doing any work with the metal roof insulation you should have it brought up onto the roof. I live in charleston sc in an old 1858 3 story wooden house. Make sure that you wear gloves and a mask for protection. Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails.

Rigid insulation under a cool roof in zone 3. Measure the height of each sheet of plywood. Plan to replace asphalt shingle roof with standing seam metal.