I'm planning a free standing deck build off the back of my house but how close to the house can I do the footings? Or can I move the footings away from the house to the circled spots and have a small cantelever and double the joists.
16 inches is ideal for all material, you can canterlever up to 3 ft if you wanted but it all depends on the size and strength of material you use aswell. most suppliers can answer those questions for you too when you shop around.
A ledger is cheaper and better for attaching deck to house then pilings on supporting beams by code must be every 8 feet and at least no more than 2 ft. in from sides ...if yuo must put pilings instead of a ledger allow at least 2 ftt out from house foundation and get 1st call to make sure no lines where you drill.
Footings can go as close to the house as you like. If you are planning a cantilever it is best to keep it maximum 2'. Simply doubling the joists is probably not a good idea - there should be a beam unless the structure is engineered. Code is a little ambiguous on the subject of decks - for example span tables don't deal with pressure treated lumber - best to review your plans with your local authority - if deck is more than 2' above grade a permit is required anyway. I prefer to see the structure free standing as you have suggested - if you were to attach the structure to the home it is important not to compromise the integrity of the exterior cladding and trap moisture against the building which could result in rot or insect activity. To properly attach to the building ideally there should be a metal flashing extending behind the cladding and over the ledger board with a drip edge to satisfy current Code - something not easy to accomplish if re-cladding the face of the home is not part of the job.
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