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Old 04-09-2007, 08:49 AM   #16
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Deck Footing


THe deck will likely be 20 ft along the side of my house and then go out 12 or 14 ft. I havn't given a ton of thought into joists size and spacing, but I am assuming I'll go with 2x10's 16 o.c.
It will be a pretty basic rectangle.

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Old 04-09-2007, 10:06 AM   #17
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Deck Footing


my 2 cents worth, read the post " my deck is sinking" then take advise given here, much easier and faster to to it right first time, than having to try and fix a mistake. I find that shortcuts have way of coming back and biting you.
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Old 04-09-2007, 01:01 PM   #18
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Deck Footing


My deck will be new construction. It is NOT repair on an existing structure. I believe with a 20x12 deck I can use 3 posts (since I will be attaching a ledger to the house. So, I should just have to pour 3 footings. Oh, I will be using 2x12's for the joists and beams, so that I only need 3 posts instead of 6 (which I would need if I were using smaller joists.
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Old 04-09-2007, 09:01 PM   #19
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Deck Footing


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Originally Posted by cibula11 View Post
My deck will be new construction. It is NOT repair on an existing structure. I believe with a 20x12 deck I can use 3 posts (since I will be attaching a ledger to the house. So, I should just have to pour 3 footings. Oh, I will be using 2x12's for the joists and beams, so that I only need 3 posts instead of 6 (which I would need if I were using smaller joists.

If you want to build this deck 12' SPAN (joist span between house and beam) X 20' Wide:

2x10's @ 16" O.C. will be fine and 2x12's @ 16" O.C. will be even better. I like to go 12" O.C just because I do. But that is up to you. Personally I would built it with 2x10's @ 12" O.C.

You will need to go to a double 2x12 beam to span 10' in between support posts. And in that case you end piers need to be MIN: 10" Diameter and as deep as required in your area. Your CENTER pier needs to be MIN 18" Diameter.
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Old 04-11-2007, 08:32 AM   #20
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Will I need just 3 end piers? I think as long as I use 2x10 or 2x12, I can use 3 piers that will span 12 ft? Does that sound right?
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Old 04-11-2007, 04:18 PM   #21
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20' wide you have 1 on each end and 1 in the center gives you 3 piers.

0--------0---------0
^ -------^ -------^
10" dia 18" dia 10" dia

Or if you wanted to you could pull your posts in on the ends 1'

-0-------0--------0-

Piers would be the same size as the other diagram
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Old 04-12-2007, 12:19 PM   #22
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For the beam made up of 2x12's can I use 2 20' 2x12? Or do I need to use two 10' 2x12 for each side (total of 4)?
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Old 04-12-2007, 10:05 PM   #23
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Originally Posted by cibula11 View Post
For the beam made up of 2x12's can I use 2 20' 2x12? Or do I need to use two 10' 2x12 for each side (total of 4)?
It would be best if you can get a hold of the 20' 2x12's. But I will warn you those suckers are a bit hefty especially if you are using PT lumber for the frame.

If you cant get 20' 2x12's you can use 10' ones just make sure you put the seam right in the center of the post.
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Old 04-13-2007, 08:48 AM   #24
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Yeah I know how heavy they can be. I'll have plenty of extra hands so I'll see about the 20'.
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Old 04-15-2007, 06:24 PM   #25
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Another question. I am going to be tearing down the existing deck which is 12x16. Since the new deck will be 12x20, is there any way I can use the existing footings to save a lot of time? Could I add dek blocks on the footing if I cut the post of even?

Or is it best to just start over and pour new footings?
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Old 04-15-2007, 08:59 PM   #26
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Another question. I am going to be tearing down the existing deck which is 12x16. Since the new deck will be 12x20, is there any way I can use the existing footings to save a lot of time? Could I add dek blocks on the footing if I cut the post of even?

Or is it best to just start over and pour new footings?

I find it best to pour new footings just because you never know if the previous deck was built to code. Even if they were the old end pier is probably not as large as it needs to be. But you never know, in my area I can reuse but I have to dig down next to a few to show that they are deep enough. With all that digging I would just rather dig my own and be done with it. Talk to your local building department they may have inspections records and plans on file from the old deck. This could tell you if the piers are suffciant.

As far as deck blocks those are a differant animal. They dont work with conventional deck building. They need to be on like every joist 4-5 per joist.

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