Stick-Built Curtain Wall Calculator

Mullion and transom quantities from facade layout.

Facade width (m)

Facade height (m)

Mullion spacing (m)

Transom spacing (m)

Design wind load (Pa)

Tab to move between fields

Mullion lines

Infill panels

220

Transom lines12

Panel width (mm)1,500

Panel height (mm)3,636

Total glass area (m²)1,200

Total framing (m)1,200

Min. mullion Ix (cm⁴)341.7

Est. framing weight (kg)5,040

How to Use This Calculator

How the result changes with Facade width (m)

Facade width (m): Total horizontal length of the curtain wall facade in metres.
Facade height (m): Total vertical height of the curtain wall facade in metres.
Mullion spacing (m): Centre-to-centre spacing of vertical mullion members. Typical: 1.2–1.8 m.
Transom spacing (m): Centre-to-centre spacing of horizontal transoms, usually matching floor-to-floor height.
Design wind load (Pa): Design wind pressure in Pascals per ASCE 7 or local code. Typical 1,000–3,000 Pa.

Mullion lines: Total number of vertical mullion members across the facade.
Transom lines: Total number of horizontal transom members.
Infill panels: Total number of glass or spandrel infill panels.
Panel width (mm): Width of each infill panel in millimetres.
Panel height (mm): Height of each infill panel in millimetres.
Total glass area (m²): Combined area of all infill panels.
Total framing (m): Combined linear metres of mullion and transom framing.
Min. mullion Ix (cm⁴): Minimum moment of inertia for mullion profile to meet L/175 deflection limit.
Est. framing weight (kg): Estimated total weight of aluminum framing members.

Identify Input Parameters
4 parameters
Facade width (m) = 30, Facade height (m) = 40, Mullion spacing (m) = 1.5, Transom spacing (m) = 3.6 = 5 input(s) provided
Calculate Mullion lines
Mullion lines = floor(facadeWidth / mullionSpacing) + 1
21 = 21
Calculate Infill panels
Infill panels
220 = 220
Calculate Transom lines
Transom lines = floor(facadeHeight / transomSpacing) + 1
12 = 12
Calculate Panel width
1500 = 1500