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Exterior Insulating Sheathing

PlastiSpan insulation at a 2” thickness applied over a 2” x 4” stud wall with R-12 batt insulation provides an R-20 wall assembly. Insulating sheathing eliminates thermal shorts, reduces air infiltration and isolates the structure from outdoor temperature changes.

  1. Follow the Building Code
    Be sure to check the National Building Code of Canada or the applicable building code in your region regarding minimum insulation, framing and vapour barrier requirements.
  2. Plan The Joints
    PlastiSpan insulation is used as an insulating sheathing board on the exterior of wood stud construction. The long edge of the board should be horizontal and the joints tightly butted together (no wider than 1 mm). Vertical joints should be made over the studs. Trim any openings such as windows, doors and electrical outlets.
  3. Use Correct Fasteners
    PlastiSpan insulation must be fastened to framing using fasteners with heads or washers at least 1/2’’ diameter where the new cladding will be applied directly against the insulation. Fasteners with heads or washers at least 1’’ diameter must be used where an air space will exist between the PlastiSpan insulation and the cladding (e.g. brick cladding).
  4. Install Sheathing Membrane
    Install at least one layer of sheathing membrane over the PlastiSpan insulation. Use tape to seal lap joints.
  5. Install Exterior Cladding
    Where nails or screws are used to attach cladding materials, such as vinyl siding, they must penetrate through the PlastiSpan insulation into the building framing or furring members..


In standard stick frame construction the wood studs act as thermal bridges through the wall assembly leaving approximately 20% of exterior walls uninsulated. That’s like throwing away 20% of your energy money.