Where should starter strips be installed in relation to the adhesive strip?

Starter strips are crucial in roofing systems, particularly for asphalt shingles. The correct placement of starter strips is on the downhill side of the adhesive strip. This positioning is essential because it creates a proper overlap that prevents water from seeping underneath the shingles. If starter strips were placed incorrectly, such as on the uphill side, it could lead to water infiltration and compromise the roof's integrity.

The adhesive strip on the shingles is designed to adhere the shingles together and helps create a watertight barrier. By placing the starter strips on the downhill side, it ensures that water flows over the starter strip and the first course of shingles, minimizing the risk of wind-driven rain entering under the shingles. This arrangement supports the effectiveness of the roof system in shedding water efficiently, thereby enhancing its durability and performance.