How To Insulate Under Roof Plywood

Measure the height of each sheet of plywood.

How to insulate under roof plywood. Leave gaps between panels. Cut styrofoam insulation to the correct size and layer it below the fiberglass already in place. Transfer the measurements onto sheets of rigid foam insulation. Clean the plywood by vacuuming away dust and debris or by wiping it with a tack cloth.

This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements. Don t wet the plywood as it s. Nail or staple the furring strips between the joists to hold the styrofoam in place. Make all cuts to the foam panels on the roof for more accurate cuts and quicker placement.

Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. 2 snap a chalk line between the length measurements. I live in charleston sc in an old 1858 3 story wooden house. Appreciate this extremely helpful blog.

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. Currently there is no insulation anywhere and the third floor basically an enclosed attic gets crushed by heat in the summer. Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails. 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.

Lay the foam insulation face down. How to insulate plywood 1. Roll out the fiberglass insulation sheets between the joists facing side up making sure it is snugly in place. Rigid insulation under a cool roof in zone 3.

If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. Make sure that you wear gloves and a mask for protection. Plan to replace asphalt shingle roof with standing seam metal.