Johns Manville AP Foil-Faced Foam Sheathing board is made of rigid polyisocyanurate foam sheathing that provides exceptional heat, moisture and air control to protect your building's exterior walls, and when installed correctly, eliminates all major thermal bridges that cause heat loss. Continuous exterior sheathing required per building codes in many states.
- Can be used in residential construction as insulated sheathing in above grade exterior walls, above and below grade interior walls, crawl spaces, attic, and cathedral ceilings as well as Type I-IV commercial applications
- One side has a reflective foil face typically installed toward the warm air surface to reflect energy back toward the dwelling and the other side has a white non-reflective foil face typically installed toward the interior
- PolyIso has the highest R-value per inch of any rigid board insulation
- Does not melt when exposed to flame versus other types of rigid foam board (ASTM E84)
- The low permeability of foil facing coupled with PolyIso's high thermal performance make it ideal for controlling condensation in walls
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