🏢 AAMA TIR A11 / ASCE 7 (Required Moment of Inertia Ix in^4 & L/175 Deflection)

Curtain Wall Aluminum Mullion Calculator

Size vertical aluminum framing mullions for unitized and stick curtain wall facade systems under ASCE 7-22 wind pressures & AAMA TIR A11: calculate required structural Moment of Inertia (I_x in^4 to limit wind deflection to L/175 or max 0.75" at spans up to 15 ft), calculate section modulus S_x, and architectural glazing contractor profits.

1. Project & Operating Inputs

Curtain Wall Facade Area (Square Feet e.g. 45,000 Sq Ft High-Rise Facade)

Design Wind Pressure (PSF e.g. 45.0 PSF Component & Cladding Wind)

Customer Bid Price for Supplied & Erected Curtain Wall ($ / Sq Ft)

Extruded Aluminum Mullions, Steel Reinforcing Stiffeners, Glaziers ($ / Ft)

2. Financial Breakdown & Yield

AAMA TIR A11 MULLION SIZING

Turnkey Curtain Wall Glazing Contract Profit

Architectural Glazing Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost