However many decks are right next to the back of your house which raises a few issues.
How to build a back deck roof.
Joining a home made roof to your existing roof might require a level of expertise that you don t really have.
How to build a roof over a deck.
Before you begin make sure you re matching the house roof pitch angle and overhang for your roof.
As a result most decks have inadequate footings to support a new porch roof.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Build the frame of the roof on the ground.
Check local building code to see if you can attach a patio roof directly to your deck.
Take a look at our step by step guide for building a shed roof over your existing deck.
Let the epoxy set leaving it overnight will assure that it is rock solid and then add the anchor bolt anchor washer and nut and tighten.
If your deck has a gap between it and your house this might not be a problem as you can simply build a stand alone deck cover.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
Building on an existing deck.
Simply put a couple of posts in the corners of the deck farthest from the building with a header between them and add rafters up to the roof of the building or attached to a ledger fastened to the wall of the building.
Typical decks are designed to support 55 psf lbs per square foot.
Many porches use 22 diameter corner and intermediate.
The footings for porch decks must be larger than deck footings.
Blow out the dust fill the hole with epoxy and insert the rod to the required depth.