ILI Sunshade Bracket Calculator

This tool uses IBC 2018 and ASCE 7-16 to calculate design pressures.  If available, use the structural design criteria for the project to determine ground snow load and wind speed.  If structural design criteria has not been established, the ground snow load and wind speed may be obtained from the Applied Technology Council (ATC).  Note that design criteria obtained from ATC may not include adjustments required by local building codes. All design criteria should be validated prior to use.

Risk Category
ASCE 7 classifies buildings and other structures based on risk to human life, health and welfare in the event of flood, wind, snow, earthquake and ice loads.  Buildings are classified on a scale of I – IV, with IV being classified as essential. Click here for further explanation about ASCE 7 Risk Categories.

Anchorage Type:  Anchorage type is based on the substrate to which the sunshade will attach.  ILI sunshades must attach to structural elements.  The anchorage type drop down menu lists anchorage types starting from the most robust at the top, thru bolts, to the least robust at the bottom of the list.

Sunshade Projection is the distance from the face of the building to the outermost point of the sunshade.  Click here for an illustration.

Tributary Width is a dimension determined by the area of the sunshade that is supported by an individual bracket.  Click here for an illustration.

The ILI sunshade bracket calculator determines design pressure based on full snow drift load and full wind exposure. This will result in a conservative design in most cases, however ILI does not recommend taking any reduction until a thorough project specific analysis is complete. Please contact ILI directly if you are working on a specialized sunshade application or are uncomfortable using this tool.