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RP Surface Mount Grid Spec Sheet
Direct Mount Grid, can attach to just about anything!
Direct Mount Grid can even attach to Joists!
For Angle Molding Divide Perimeter by 8
For Main Runners and Top Hangers - Divide Square Feet by 16 you will need this number for both Runners and Top Hangers.
For cross T's Divide Square Feet by 8 for a 2' x 4' layout or by 4 for a 2' x 2' layout