Typical decks are designed to support 55 psf lbs per square foot.
Building a gable roof over a deck.
The gable design of the roof will also allow for excellent rain and snow runoff in wet climates.
Carefully place trusses precisely on the marks made and nail them into place one at a time.
Beginning at the shorter side of the deck roof mark the locations for the roof trusses every 24 inches on the center of the tops of the 2x8 pieces of lumber.
How to build gable roof over deck porch.