Op warner has it new posts and footings for the roof.
How to put a roof on your deck.
Always check the local codes.
For deck roof posts dig holes for the roof posts and pour cement to keep them secure.
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Check local building code to see if you can attach a patio roof directly to your deck.
When the roof has snow on it.
If you simply add a roof to a deck not designed to support one without the right retrofitting you will be putting your family members and guests at risk.
If you want a deck with a roof build the deck with proper support whether you plan to add the roof initially or later down the road.
Porch decks also require larger footings than deck footings.
Hand framing a porch roof involves first setting the ridge beam and the side walls to the proper height that the roof will hang from.
Blow out the dust fill the hole with epoxy and insert the rod to the required depth.
Not sure how you build your roofs but yes the weight of a roof does put load on beams or in the op s case 2 cantilevered joists and rim joist.
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Building on an 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.
Most porch roofs use 2x6 or 2x8 rafters that form an upside down v across the ridge beam.