The Way to Install Rigid Foam Underneath Armour
Many houses built today have a”dual wall” kind of insulating material, with fiberglass batts secured between the studs on the interior and rigid foam board over the wall sheathing on the outside. Any sort of siding can be set up within the foam — cedar or redwood planks, outside plywood sheets, cement fiber board or vinyl siding are typical alternatives. In a common situation, walls are built with 2-by-4-inch studs spaced and sheathed with board. Brick or cedar shakes require furring strip adaptation to be installed over foam.
Measure the walls from top and purchase either 4-by-8-foot or 4-by-9-foot sheets of foam insulation, to protect from the house’s roof line to the plate in the base of the wall. Use extruded polystyrene or XPS to thick – in most cases, but check for certain recommendations on depth in local area building agencies.
Place the wall with panels, starting at one end of the home, align the edges together with bottom and all the corner of the wall and then nail them to studs with 3/8-inch head galvanized nails. Drive nails into the studs, nails spaced 24 inches apart along each stud. Put the nail heads flush with the foam board; don’t overdrive and dimple the foam. Use claws enough to penetrate the foam and 3/4 inch into the wall.
Place panels together; some fashions have tongue and groove edges, so one panel slides into the following. Cover an entire wall and use to cut openings for windows and doors out, working from inside the home. Use a utility knife to trim around electric boxes, exterior faucets or similar protrusions since you are covering the walls.
Seal the seams between panels, wall corners and door and window openings once the entire home is covered with foam board. Use tape supplied by the producer of the foam board. Run tape over the seam on both boards and tape top and bottom edges also. Put across the sides of doors and windows and fold it over.
Wrap the home and then install siding that is desired by nailing into the house framing through the foam board. Use claws enough to penetrate the foam and siding board.