Rigid Foam Sheathing Siding

Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.

Rigid foam sheathing siding.

2 in x 4 ft x 8 ft. Rigid foam across foundation also. This eliminates thermal bridging which is the energy lost through wall studs. 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.

Insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding. 2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation item 15357 model 2x48x96 r tech. The panels provide a continuous energy efficient surface. Use thicker siding patterns in widths of 8 203 mm or less.

The cavity is stuffed with fiberglass then expanded foam sheathing followed by cedar board and batten siding. Rigid foam sheathing can cause moisture to accumulate on the back of siding and cause staining buckling and damage to finish coats. 3 benefits of rigid foam sheathing. 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.

Thick narrow siding. Moisture can get trapped between the siding and the foam leading to paint failure and causing clapboards to cup and curl. Our house is 2x6 construction built in 1984 near milwaukee wi. The following recommendations are meant to minimize potential problems when cedar sidings are applied over rigid foam sheathing.

Sheathing and penetrate framing a minimum 1 inches. But if you use wood clapboard siding foam sheathing can cause trouble.