Installation Guide

7. For window installation the nailing flange is set against a silicone bedding and fastened to the framing with 1½”
galvanized roofing nails, 3” from each corner and 8” on center. A 3” wide butyl flashing can be used to seal the sill of
the window and a 2” wide butyl flashing can be used to seal jambs and heads. Refer to window manufacturer’s
instructions for proper window installation.
8. Brick, wood, hardboard, aluminum or vinyl sidings are fastened to the wood frame construction through the
insulation in accordance with the siding manufacturer's instructions.
Helpful Hints:
Use a utility knife and straight edge to trim the insulation board to conform to irregular wall angles, projections or wall
surfaces less than board width or height.
In stick-built construction, consider using 4' x 9' Dow insulation boards to effectively cover the sill plates, floor/ceiling
junctures, band box and headers in one easy application.
Shakes or shingles can also be applied by installing furring strips or a plywood nailer base over the insulation and
attaching the shakes or shingles in accordance with the manufacturer's instructions.