The following recommendations are meant to minimize potential problems when cedar sidings are applied over rigid foam sheathing.
Rigid foam sheathing siding.
Install rigid foam over or in place of plywood osb or other wall sheathing.
Rigid foam sheathing can cause moisture to accumulate on the back of siding and cause staining buckling and damage to finish coats.
1 in x 4 ft x 8 ft ap foil 1 faced polyisocyanurate foam board insulation item 101645 model 90001019.
Moisture can get trapped between the siding and the foam leading to paint failure and causing clapboards to cup and curl.
Thick narrow siding.
Follow with a 2x4 frame wall and insulate it with batt insulation.
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.
Johns manville r 6 common.
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.
Rigid foam across foundation also.
The panels provide a continuous energy efficient surface.
Use thicker siding patterns in widths of 8 203 mm or less.
A common choice is drywall.
The cavity is stuffed with fiberglass then expanded foam sheathing followed by cedar board and batten siding.
Our house is 2x6 construction built in 1984 near milwaukee wi.
1 in x 4 ft x 8 ft.
3 benefits of rigid foam sheathing.
Install continuous rigid foam insulation or insulated siding to help reduce thermal bridging through wood or metal framed exterior walls.
Keep in mind that any interior rigid insulating panel must be covered by a barrier.
But if you use wood clapboard siding foam sheathing can cause trouble.
Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.