Rigid Foam Sheathing Siding
Many houses built today have a double wall type of insulation with fiberglass batts fastened between the studs on the inside and rigid foam board over the wall sheathing on the outside.
Rigid foam sheathing siding. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. Sheathing and penetrate framing a minimum 1 inches. Install rigid foam over or in place of plywood osb or other wall sheathing. Our house is 2x6 construction built in 1984 near milwaukee wi.
Current pneumatic nailers have maximum fastener lengths of 3 to 3 5 which limits insulation thicknesses to 1 5 max 3 5 fastener to siding 1 embedment 3 5 0 5 1 5 1 5 max insulation therefore for insulation greater than 1 5 direct. Thick narrow siding. But if you use wood clapboard siding foam sheathing can cause trouble. The cavity is stuffed with fiberglass then expanded foam sheathing followed by cedar board and batten siding.
Insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding. Install continuous rigid foam insulation or insulated siding to help reduce thermal bridging through wood or metal framed exterior walls. Rigid foam across foundation also. 2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation item 15357 model 2x48x96 r tech.
The following recommendations are meant to minimize potential problems when cedar sidings are applied over rigid foam sheathing. 3 benefits of rigid foam sheathing. More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e. 2 in x 4 ft x 8 ft.
The panels provide a continuous energy efficient surface. Use thicker siding patterns in widths of 8 203 mm or less.