How far apart the footings are is determined by the size of joists you use. Footings will differ based upon the type of project. I'm using 2/10 girders and 2x8 joists. Looking at putting a deck off the back of the house. Draining Footings should be well drained to prevent the damage that water pressure and freezing water can cause. Post Hole Excavation and Post Setting. ... then 5-6' apart. However with the deck blocks the deck will shift with the ground.If you sink the post in the ground 48" it will keep your deck from shifting.the 48" footings are generally used if the deck is constructed at a higher elevation and the post are attached with a post shoe sunk into the concrete. Complete deck building code tips for railings, ... treads, footings, ... See how far apart you can space solid or notched stringers. Some builders position them every 4 feet for a completely rigid frame. From the girders I was going to hang 2x8's. At 12" above grade, you won't have room under the deck for a beam to support the joists, so each joist will have to have footings under it. If your deck is like most where it has two wooden deck posts and a rim joist that is bolted to the house, each of the two deck post holds up approximately 25 percent of the total weight. Layout and Footing Locations. For my girders, I was going to sandwich a 4x4 post in between 2x10's. How to Build a Deck: Post Holes and Framing. Dig and pour your deck footings so they extend below the frost line. Pier placement depends on wall structure and how the weight of the building will be distributed throughout the foundation. In general, posts should be spaced no more than 8 feet apart. That can be achieved with 2 x 8 joists spaced 24 inches apart. That way, they won't move, or heave, ... How to Build a Solid, Frost-Proof Deck Footing. I thought of having (3) 4x4 post in the 16' direction and (3) posts in the 18' direction plus the ledger board. How many footings do I need for a deck? How To Build A Deck2-Planning Your Deck ... All footings should be reinforced with concrete to minimize settling. In general, posts should be spaced no more than 8 feet apart. The Building a deck, 12x16, how often put 4x4 footer? If you are planning on installing a hot tub or porch on top of your deck you will usually need more footings and posts to support the additional loads. ... 2 Responses to Deck Piers and Footings. ... How far apart the footings are is determined by the size of joists you use. The larger the beam and footing size the fewer footings that are required. And each footing is going to have to be AT LEAST 42" deep to prevent frost heave. DEAR TIM: I am building a deck and wonder how far down I have to dig into the ground for the wood deck post. As in our example, your joists must span the 8 ft. between the house and the outer beam. ... Building a deck, 12x16, how often put 4x4 footer? Footing,Footings,Footer,Foundation . I'm building an addition to my existing deck 8' by 38 1/2'. Footings will differ based upon the type of project. Good luck with your project. Your post footings are the foundation of your deck and just like your house, the deck is only as strong as its foundation. Deck is going to be 16' x 18' (16' parallel with house). Most footings, if building a deck for example, should be about six feet apart. The more the better ... it doesnt require beams. Most footings,if building a deck for example, should be about six feet apart. For most situations you will want to place footings and posts less than 8' apart. ... how many [Decking] posts? How far apart should these piers be? When installing piers for a pier-and-beam foundation, you have options as to how far apart the piers can be installed. Some builders position them every 4 feet for a completely rigid frame. Common pier placement distances are 8 to 10 feet apart. ... suggest using something like bigfoot deck footings. There are various methods of how to set deck posts and footings which typically consists of digging below the frost line and setting posts on concrete.