For under deck roof

https://www.familyhandyman.com/decks/building-a-deck/under-deck-roof/view-all

Plan to space the 2×4 purlins parallel to the house and 3 ft. on center. To provide drainage, the panels should slope toward the outside edge of the deck about 1/4 in. per foot. If the span under your deck is 12 ft., for example, the purlin at the outer end of the deck should be 3 in. lower than the purlin along the house (12 x 1/4 = 3).

Pitch: 1/4″ per foot.

4 Purlins? baby.

Supplies:
http://www.homedepot.com/p/Metal-Sales-12-ft-x-2-1-2-in-Corrugated-Steel-Roof-Panel-in-Galvalume-HD2141912/207188150

Need 6 attachment point for

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