Calculation services

Guardian Glass North America - spiral sky scrapper

Creating stronger, safer buildings together

The Guardian team offers the tools, expertise and commitment to help ensure your project is safe and strong. Find our comprehensive suite of tools below, as well as helpful information around important design considerations.

Guardian Glass North America - Glass Analytics, woman working at computer

Glass Analytics

Guardian’s award-winning suite of tools to support architects, glass fabricators and other Guardian customers, including Glass Visualizer, Performance Calculators and the Sustainability Calculator.

Learn More

Design considerations


Wind loads
Wind load is the force of wind creating pressure that glass must resist. A specific building’s wind load depends on its height, shape, relationship to surrounding buildings and terrain, as well as local wind speeds and the duration of gusts.

Center deflection
One key factor in calculating wind load is center deflection. Excessive center deflection can result in edge pull out and distortion of reflected images. Center deflection can also cause contact between the glass and interior components, such as room dividers and window blinds. Calculating wind loads becomes even more complex with insulated glass. These cases require a computer-assisted wind load analysis to adequately consider many variables, including:

  • Air space expansion and contraction caused by the effects of changing temperatures
  • Barometric pressure, altitude and differences in weathering in the #1 and #2 surfaces
  • Asymmetrical loading (lites of varying thickness)
  • Load-sharing other than 50-50
  • Edge condition (free or fixed)
  • Variation in sightline or air space width
  • Thermal stress
Carefully weigh these variables because they can dramatically alter the data taken from a standard wind load chart.

Relevant standards
For projects built in the U.S., Guardian follows the current ASTM E 1300 “Standard Practice for Determining the Minimum Thickness and Type of Glass Required to Resist a Specified Load.” This information represents in-service glass, superseding the traditional straight-line graph and other wind load charts, and may differ for other countries.