Internal Floating Roof Storage Tanks; Att Tank offers a comprehensive line of aboveground internal floating roof storage tanks. Constructed with a variety of materials for product compatibility, Att Tank internal floating roof storage tanks are customized for each specific application. From Skin and Pontoon, to Full-Contact, Att Tank’s internal floating roof storage tanks are unmatched in design, quality, craftsmanship and commitment to offering comprehensive solutions, including working capacity optimization, emissions reduction, heel reduction and storage tank asset longevity. All Att Tank - internal floating roof storage tanks are engineered with safety top of mind.