Solar for low pitch roof with TPO membrane

This roof has a low pitch sealed with a thermoplastic polyolefin (TPO) membrane for which the racking solution is similar to flat roofs.

When our clients have a low pitch to the roof, we can use ballasted, non-penetrating basket-style racks, such as the Ecofoot 2+ shown here. On a low pitched roof is we need to add roof anchors on the low side to keep the solar system from moving down hill.  In the case of this solar array, we needed only four anchors with sealed roof boots, to satisfy the code regarding snow and wind conditions.

The roof anchor and cross-strut hold the last row of the solar array firmly to this low-pitched roof.

A few well-placed roof anchors prevent the solar array from moving down the roof, while the pavers on the PVC baskets prevent uplift.

Project specs:

  • System size: 13.8 kWdc
  • Mounting: TPO roof (10 degrees tilt on fixed EcoFoot 2 racking ) with panel facing 209 degrees.
  • Year Installed: 2018
  • Electricity offset: Saving $3,200 per year.
  • State grant: $8,280
  • Federal & state tax credit incentives: $32,405
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