Isobrace osb rigid insulation for above grade exterior walls laminated to a 7 16 osb.
Insulation between osb and siding.
If you prefer to use polyiso without a foil facing feel free to do so.
Hot sun can overheat wood siding causing it to dry excessively and crack.
Below are some of the design details along with the benefits.
Everything on the exterior side of the polyiso the furring strips and siding will dry to the exterior while everything on the interior side of the polyiso the osb studs and fluffy insulation will dry to the interior.
Isobrace osb combines the insulation performance of an expanded polystyrene panel with the rigidity of a 7 16 oriented strand board osb.
Installing foam board insulation under vinyl siding today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding.
How to install rigid foam under siding.
As a result the siding cups cracks and sheds paint.
Foam is less permeable to water vapor and the back of the siding stays wet as the face of the siding dries.
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.
Unless you provide a small gap between the exterior face of the osb and the back surface of the foam sheathing to provide for some hygric redistribution.