Can aluminum ceilings achieve a 1-hour or 2-hour fire rating?

Yes, aluminum suspended ceilings can be rated for 1-hour (60 min) or 2-hour (120 min) fire resistance when specified components and assembly methods are rigorously followed. Achieving a 1-hour rating typically involves aluminum panels (0.7–1.0 mm) with intumescent coatings, a single layer of mineral wool or gypsum board above the grid, and tested fire-stop sealants at perimeters. For a 2-hour rating, manufacturers increase insulation thickness (e.g., dual layers of 50 mm mineral wool), use thicker panels (up to 1.2 mm), and incorporate robust thermal links in suspension clips that activate at higher thresholds. The entire assembly—panels, grid, insulation, seals, and clips—must be tested together under ASTM E119 or EN 1364-2 conditions. Installation must mirror the tested configuration exactly: any substitution or omission can reduce the actual rating. With certified components and certified installation, aluminum ceilings reliably meet both 1- and 2-hour requirements.