How to build a roof over a deck step 1.
Building roof deck plan.
Many porches use 22 diameter corner and intermediate footings.
Shed gable and hip.
Gable roof the most common type of deck roof the gable roof forms a triangular shape.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Frame up a box the size of the outer dimensions of your deck using 2.
As a result most decks have inadequate footings to support a new porch roof.
Make sure the frame has the appropriate blocking to ensure a solid connection.
Install post base connectors to attach the support posts to the deck frame.
Typical decks are designed to support 55 psf lbs per square foot.
Build the frame of the roof on the ground.
Shed roof a single sloping surface that starts at the exterior house wall and ends at support posts.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
There are three types of roofs that you ll find over a deck.
The footings for porch decks must be larger than deck footings.