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 add a roof over an existing deck.
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Decks typically are designed to support 55 pounds per square feet or psf of weight.
Typical decks are designed to support 55 psf lbs per square foot.
Discuss the following issues with your professional handyman during the deck roof design process.
Install post base connectors.
No matter the situation either attaching to an existing deck or building onto a deck that is being built in progress the weight of the roof needs to be considered in relation to the deck.
Before you begin make sure you re matching the house roof pitch angle and overhang for your roof.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
If the roof is attached to the deck it needs to be able to support the weight.
If the deck doubles as a porch it needs to be able to support no more than 80 psf.
How to build a shed roof over my existing deck.
These are used to attach the support posts to the frame of the deck.
Porch decks also require larger footings than deck footings.