The most common CorGal tanks in use are the tanks with 30-degree roofs. This standard tank consists of corrugated galvanized steel wall sheets with a 30-degree galvanized steel roof system. The standard 30-degree roof tanks are equipped with a geotextile preliner and a flexible membrane main liner for water containment.

Flat Seam roof (Standard for 6', 8' and 9', diameter models but corrugated high-rib roof is available) CHR Corrugated High Rib Roof is standard for all 12' diameter and larger)

All 30 degree roof tanks are pre-engineered for water storage in a seismic zone 2B with 90 mile an hour wind speed at UBC exposure C location. Roof snow load ratings are available at specific locations.