Learn everything you need to know about installing concrete footings to support your deck.
Footings for deck roof.
Many porches use 22 diameter corner and intermediate footings.
Check out our deck footing frost map to help you understand how deep your footings will need to be excavated.
When you pour concrete footings hold the cardboard concrete form tube about 12 in.
Gable end porches will also require an additional footing in the center of the side rim to transfer the truss or rafter loads to the footings because the framing of the roof is perpendicular to the floor framing.
Do this by nailing the sides of the tube to the center of a tic tac toe grid of 2x4s at the top of the hole.
Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons.
Up from the bottom of the footing.
How to get a solid frost proof footing.
If the deck doubles as a porch it needs to be able to support no more than 80 psf.
Then dump concrete through the tube into the bottom of the hole.
Porch decks also require larger footings than deck footings.
The footings for porch decks must be larger than deck footings.
Decks typically are designed to support 55 pounds per square feet or psf of weight.
Put a roof over that deck and perhaps a pier footing foundation is a better choice because it offers more uplift resistance.
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.