Porch decks also require larger footings than deck footings.
I beam pocket deck support at roof detail.
Installing 2x8 deck beams if the outside edge of your deck is at least 17 above grade a double 2x8 beam should be installed to support the joists along the outside.
Decks typically are designed to support 55 pounds per square feet or psf of weight.
Detailed drawings single ply.
20 6x6 pt posts would be long enough to use as both deck support and roof support but the expense isn t justified because all that is needed to support the roof would be 4x4s.
If the deck doubles as a porch it needs to be able to support no more than 80 psf.
According to dca6 on any deck higher than 2 feet above grade diagonal braces should be installed between the posts and the beam and the posts and the joists.
Fb 523 i beam flashing detail fb 526 pitch pocket flashing detail fb 530 exposed sleeper fb 531 fixed equipment support detail 8 4 23.
These braces stabilize the post to beam joint and help resist lateral loads.
If the roof is attached to the deck it needs to be able to support the weight.
Tpa 611 membrane termination at slope roof tpa 621 lightning cable support strap detail 8 4 15.
To keep the post in place and to prevent any twisting or shifting the connection should be reinforced with steel strapping a steel connector or a treated plywood cleat figure 4 13.
For the strongest connection of beam to post place the support beam directly on top of the posts rather than bolting them to the side so the full load is transferred to the posts.