Chapter 5

Racking Systems—General Considerations

5.1 Introduction

Chapter 5 involves the design and layout of photovoltaic racking systems and the installation of them on a variety of different roof types. We will cover two commonly encountered roof types: asphalt composition shingle and flat concrete tile. Other common roof types include two-piece C-tile, one-piece S-tile, standing seam metal roofs, torchdown, and membrane roofs (e.g., PVC). We will not cover these roof types, basically because of a lack of time.

The role of the racking system is to provide a sturdy, weatherproof foundation for a roof-mounted PV system. A racking system is typically composed of brackets (a/k/a anchors or footings), flashing, rails, and module clamps. Brackets ...

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