How To Insulate Under Roof Plywood

Rigid insulation under a cool roof in zone 3.

How to insulate under roof plywood. 2 snap a chalk line between the length measurements. With a warm roof the usual process is to split the insulation into two layers. Before doing any work with the metal roof insulation you should have it brought up onto the roof. Clean the plywood by vacuuming away dust and debris or by wiping it with a tack cloth.

Leave gaps between panels. I live in charleston sc in an old 1858 3 story wooden house. Measure the height of each sheet of plywood. 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. Plan to replace asphalt shingle roof with standing seam metal. This reduces the need to go up and down the ladder for tools pieces of insulation and making measurements. 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.

Nail or staple the furring strips between the joists to hold the styrofoam in place. Roll out the fiberglass insulation sheets between the joists facing side up making sure it is snugly in place. Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing. Transfer the measurements onto sheets of rigid foam insulation.

Make sure that you wear gloves and a mask for protection. Cut panels on roof. How to insulate plywood 1. Currently there is no insulation anywhere and the third floor basically an enclosed attic gets crushed by heat in the summer.

Appreciate this extremely helpful blog. Don t wet the plywood as it s. Lay the foam insulation face down.