Insul-Lam
Insul-Lam is used as a non-structural nail base in either a one or two layer system.
Two-Layer System – Begin by installing the 2x dimensional lumber dam around the perimeter of the roof. The height of the dam is determined by the depth of Insul-Lam being installed. In residential applications, PBS recommends the use of a vapor retarder with either the one or two layer systems. You will need to cut one 2’ x 4’ foam section and enough 2’ x 8’ foam sections from your shipment to ring the perimeter flush to your lumber dam.
Once the 2’ sections are in place, layout the remaining 4’ x 8’ foam sheets.
Top Layer – Apply the nail base top layer perpendicular to the foam layer so that joints overlap. You will need to remove 1 1/2” of foam along the edges of your perimeter course so the OSB overlaps your lumber dam. Once an Insul-Lam top sheet is in position, fasten the assembly to the deck with Premier Panel Screws following the spacing and frequency determined by engineering. Penetrate the structural deck to a depth of at least 1”. Along the perimeter