Once your deck preparation is completed you can start to measure and chalk your roof layout. Your first step to field installation will be to install the first course of interlayment. Ensure all interlayment laps over rake, eave, and valley metal. When installing field slates ensure a minimum gap of 1/16” between slates. Interlayment for 12” length slates will be marked at 8” (exposure) and 14” length slates will be marked at 10” (exposure). Interlayment MUST cover nail heads which are typically 2.5” – 3” down from top of slate. Continuing installing subsequent interlayment and field slate courses up the roof.

Install first course of interlayment.
Lap interlayment over Rake, Eave and Valley metal.
Slate overhangs rake and eave.
Ensure minimum 1/16” gap between slates.
Cut valley slates.
Mark 8” exposure for 12” (L) slates or 10” exposure for 14” (L) slates for next course of interlayment.
Alight bottom edge of interlayment to 8” or 10” marks.
Important: Interlayment MUST cover nail heads.
Install subsequent courses.