Step 6 (Simplified): Review Structural PV Array Mounting Requirements

The structural requirements for mounting a PV array on a residential rooftop that are presented in this section are consistent with the approach taken by SolarAPP+. For jurisdictions that require a more detailed approach to the structural PV array mounting requirements, please skip to Step 6 (Detailed): Structural PV Array Mounting Requirements. These detailed requirements are intended to meet all the requirements of the residential code without the need for a structural engineer’s certification in most cases. The items below from the SolarAPP+ process represent a sufficient characterization of the residential code requirements for systems that meet these criteria. ***NOTE: These guidelines are a living document and may be revised. Last updated: 9/16/21***

1. The weight of the PV system 4 lbs/sq ft. or less

2. The attachment points of the mounting system are staggered (no check requires low snow and wind load location)

3. The maximum spacing in inches between adjacent attachment points of the mounting system 48” or less (no check means that the spacing is no larger than 72” and requires no snow and low wind load location)

4. The array is on a single roof face (if no check, how many roof surfaces at different slopes and/or orientations will be used for installation? ______(fill in)

5. The PV array is flush mounted (parallel to roof)

6. If “5.” not checked is the maximum distance off the roof no greater than 10” (if no check, this process cannot be used)

7. The solar module and mounting system rated by the manufacturer to withstand the upward force of the local wind speed and evenly distribute load into the supporting structure at the proposed maximum spacing, and confirmed in UL 1703 or 61730, and 2703 listings (validated through the UL 1703 or 61730 module rating for mechanical load rating, and UL 2703 mounting system mechanical load rating)

8. The individual roof structure appears to be structurally sound, without signs of alterations or significant structural deterioration or sagging.

9. What is the roof covering material? _______________(fill in blank)

10. What is the slope of the roof surface? _______________ (fill in blank)

Supplemental Resources for Simplified Structural PV Requirements:

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