If that's the case, then the city people say 4 posts are enough is correct on the condition that you need to use ledgeboard which means it has to be attached to your wall.
if you use ledgeboard, the footings can be placed about 10' from your back wall/ledgeboard, and leave about 2' overhang for joists. and the post span will probably 10', that will leave one feet overhang on both sides.
----------------------------------------------------------------------------- ledgeboard
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10'
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--1'--post1-------10'---------post2------10'-------post3----10'----post4--1'--
for post span at 10', it is suggested to use 3 x ( 2 X 12 ), and your joist can use 2 x 8 for 10' span at 16" apart.
if you do not want to use ledgeboard (free standing deck), add four more posts about 2' away from your back wall,
hope this helps.
if you use ledgeboard, the footings can be placed about 10' from your back wall/ledgeboard, and leave about 2' overhang for joists. and the post span will probably 10', that will leave one feet overhang on both sides.
----------------------------------------------------------------------------- ledgeboard
|
|
|
10'
|
|
|
--1'--post1-------10'---------post2------10'-------post3----10'----post4--1'--
for post span at 10', it is suggested to use 3 x ( 2 X 12 ), and your joist can use 2 x 8 for 10' span at 16" apart.
if you do not want to use ledgeboard (free standing deck), add four more posts about 2' away from your back wall,
hope this helps.