Nail 2 boards onto your walls as top plates.
Build gable roof over deck.
Step 1 build the frame of the roof on the ground.
Frame up a box the size of the outer dimensions of your deck using 2 by 4 inch lumber.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
Installing a porch roof over an existing deck is usually not recommended unless the deck was originally designed to support a future porch.
How to build a roof over your deck.
To provide for roof decking nail the sheeting pieces of inch plywood to the trusses.
Attach roofing felt to the plywood with roofing tacks.
Typical decks are designed to support 55 psf lbs per square foot.
Build a gable roof over a deck.
This significantly sloped deck roof allows for proper drainage of rain and snow as opposed to a flat roof.
Paint your gable roof as required.
Be sure to overlap the roofing felt 4 inches at all edges.
Building a gable roof over your existing deck will make it more comfortable providing shade and shelter from the rain.
A gable roof also blends in well with many types of architecture.
Gable roof the most common type of deck roof the gable roof forms a triangular shape projects along a ridge down the center of the deck and overhangs the enclosed space.
Always use professionally engineered roof trusses designed for the dimensions of your roof.
Nail the first boards on top of your wall where you plan to build your roof.
How to build gable roof over deck porch.
Then run joists connecting the front of your roof with the rear every two feet along the length of your roof.