Photovoltaic roofing components and systems

A photovoltaic roofing system disposed on a roof deck, the photovoltaic roofing system comprising:

• a two-part tee element disposed on the roof deck, the two-part tee element comprising:
• a base piece including a central portion;
• two opposed horizontally-extending first and second flanges extending from the central portion, and a top piece attachment feature formed in the central portion, the top piece attachment feature including an upwardly-extending feature, and
• a top piece including a base piece attachment feature, the base piece attachment feature including a downwardly-facing channel, the base piece attachment feature being mated with the top piece attachment feature of the base piece by the upwardly-extending feature of the top piece attachment feature of the base piece being disposed within the downwardly-facing channel of the base piece attachment feature of the top piece;
• a first covering flange extending outwardly from a side of the top piece, and a vertically extending portion extending upwards from the base piece attachment feature and the first covering flange;
• and
• a first photovoltaic element disposed on the roof adjacent the base piece, the first photovoltaic element having its edge disposed on the horizontally-extending first flange of the base piece of the two-part tee element, the first covering flange of the top piece overlapping the top surface of the first photovoltaic element.