This article discusses strategies for building over an existing slab patio or over a deck and offers links to articles about the specific tasks such as pouring the footings raising posts and so forth.
How to build a roof over an existing deck.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
Roof and wind loads created by adding a roof.
Post base connectors.
The first thing you ve got to think about is how the deck roof is going to sit alongside your existing home.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Typical decks are designed to support 55 psf lbs per square foot.
Installing a porch roof over an existing deck is usually not recommended unless the deck was originally designed to support a future porch.
If you have an existing deck it s possible to add a roof to it by installing additional supports.
Discuss the following issues with your professional handyman during the deck roof design process.
If you are tying the shed roof into an existing roof on the house you will need to remove the shingles and sheathing to expose the roof framing.
Building a shed roof over a deck.
The best time to build a roof over your deck is during the construction of the deck itself.
However many decks are right next to the back of your house which raises a few issues.
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.
Install post base connectors to attach the support posts to the deck frame.
Make the front of the roof the height of the house roof you are presumably tying into with the rear sloping at a rate of six inches over two feet.