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Document #800-0329-001 Rev F
File Generated July 3, 2013
Page 16
ZS SPAN INSTALLATION MANUAL FOR RAIL-BASED APPLICATIONS - U.S.
3.2 Using the Span Tables
In addition to the Zepulator online design tool, Zep Solar, Inc. provides complete Span Tables that
are included with the Engineering Certification Letters for each country. These tables represent
tested structural values for every combination of hardware that is approved for use with Zep Com-
patible roof mounted PV arrays. The Engineering Certification Letter may also be provided to build-
ing officials when submitting for a permit, or for use by independent engineering consultants.
Figure 3.5 Span Table Example (ZS Span - US)
Wind speed
Roof pitch
Specific option for
roof attachment
hardware
Roof zone
Maximum allowable East-
West span (across rafters)
Snow load
Module orientation
Tile shape
Drop-in direction
Exposure category
Maximum allowable North-South span
(up the rafter), shown in increments of
2, 3, and 4 Tile Reveals, assuming a 14-
inch reveal.