Self-adhesive membrane that eliminates the need to cut shingle tabs. Comes with a seal tab to prevent wind uplift at the roof edge. Fast installation and the membrane is waterproof and self-sealing around nails and other penetrations. Shingle Starter is adhered directly to the roof deck or to IB-3 self-adhesive shingle underlayment. Apply on areas that will receive shingles the same day. Airborne dirt and debris can affect the seal tab's ability to properly seal to the shingle. 7.2" x 33.5'. This product is 50 mil. thick with a black, granular surface. The roll's hard core prevents collapse of roll and humping on the deck surface.