In this case simply lay the insulation between the purlins.
How to install insulation under existing metal roofing.
Lay and attach plywood or osb oriented strand board to the exterior.
Attach a weather proofing or vapor resistant sheet of material over the plywood.
Install by using staples.
Make sure that the insulation you are using is the same thickness so that the metal roof will fit better.
Insert 3 inch galvanized screws through the fastening plates.
Enter fiberglass insulation a common relatively inexpensive easy to use product.
Measure the roof area and.
Insulating a new metal roof step 1 install plywood or oriented strand board osb to act as structural roof sheathing.
Use a drill to drive.
If you plan to insulate your metal roof with fiberglass go ahead but follow smart installation procedures.
It can lie down perfectly under the metal roofing without having to deal with the hassle.
How do i insulate a metal shed roof with rigid foam.
Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails.
Position the fastening plates over the insulation board.
Remove the existing roof if you have one.
One of the more popular methods of placing metal roofing on a home is to lay down purlins across the existing shingles.