Rigid Foam Sheathing Siding
Moisture can get trapped between the siding and the foam leading to paint failure and causing clapboards to cup and curl.
Rigid foam sheathing siding. The cavity is stuffed with fiberglass then expanded foam sheathing followed by cedar board and batten siding. Sheathing and penetrate framing a minimum 1 inches. 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. Rigid foam sheathing can cause moisture to accumulate on the back of siding and cause staining buckling and damage to finish coats.
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. 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. Insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding. Install rigid foam over or in place of plywood osb or other wall sheathing.
Use thicker siding patterns in widths of 8 203 mm or less. Thick narrow siding. The panels provide a continuous energy efficient surface. Our house is 2x6 construction built in 1984 near milwaukee wi.
2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation item 15357 model 2x48x96 r tech. But if you use wood clapboard siding foam sheathing can cause trouble. This eliminates thermal bridging which is the energy lost through wall studs. The following recommendations are meant to minimize potential problems when cedar sidings are applied over rigid foam sheathing.
Install continuous rigid foam insulation or insulated siding to help reduce thermal bridging through wood or metal framed exterior walls. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.