Armstrong Tectum 2x4 Acoustic Ceiling Tiles vs Armstrong Cirrus 2x2 Ceiling Tiles

Both are Armstrong mineral fiber lay-in panels for a 15/16 inch grid, so the choice comes down to format and acoustics. The Tectum 2x4 is the tougher panel: 1 inch thick, NRC 0.75, CAC 35, and it handles humid, high-traffic spaces like pools and gyms. The Cirrus 2x2 is the standard office and utility-room tile: thinner, NRC 0.70, no published CAC, but brighter at 85 percent light reflectance and easier to handle one-handed. Buy Tectum for hard-use or moisture-prone rooms and for blocking sound between spaces; buy Cirrus for general ceilings where a clean, bright look and simple 2x2 handling matter more.

• Choose the Tectum 2x4 if the ceiling is in a pool, gym, industrial or other damp, hard-use space, or if you need sound blocking between rooms as well as absorption.
• Choose the Cirrus 2x2 if you are finishing an office, storage or utility room and want a bright, easy-to-handle tile in a standard 2x2 grid.