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01-11-2010, 03:25 PM   #1
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## 16 x 20 deck question

Passing on a question that was asked to me, and I am not sure either way so I thought I would ask everyone here.

The situation:

Friend of mine is looking to install a 16 x 20 deck, 16' feet against the house and 20 feet out

His house is on a sill wall with a small crawl space. Currently he has a 8 foot sliding glass door with some old concrete steps. He wants to put a 16 x 20 deck.

The question, from F.G. - Finished Grade to the bottom of the sliding glass door is 18 1/2'' when we did the calculations

2 x 6 P.T. as the deck board = 1.5''
2 x 8 P.T. Joist = 7.5''
4 x 6 P.T. Beams = 5.5''
-------------
14.5''
Calculate footings up 2.5'' approx and then looked at the Simpson ABA or ABU attachments another 1'' approx.

This would leave no room for a column, is this ok?

I can not see why it would be a problem, and we need to contact the city as they will be the final deciders but wanted to see if anyone has had any experience with anything like this in there personal or work experience.

On a deck this low does anyone have any other suggestions on how they would build it.

01-11-2010, 04:14 PM   #2
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You would set the sonotubes at the height the 4x6's would be sitting on the standoffs.
Ron

01-11-2010, 04:22 PM   #3
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Quote:
 Originally Posted by Ron6519 You would set the sonotubes at the height the 4x6's would be sitting on the standoffs. Ron
Sonotubes - ? - Would that be the the 12'' x 12'' x 48'' concrete form???

So set it up a couple inches so the 4 x 6 beam can rest on the concrete pier??? That is the plan wanted to get everyones thought on the idea.

01-11-2010, 04:47 PM   #4
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Quote:
 Originally Posted by canyonbc Sonotubes - ? - Would that be the the 12'' x 12'' x 48'' concrete form??? So set it up a couple inches so the 4 x 6 beam can rest on the concrete pier??? That is the plan wanted to get everyones thought on the idea.
Sonotubes are just one companies name for cardboard tubes you fill with concrete. They come in various widths.
Ron

 01-11-2010, 10:11 PM #5 Member   Join Date: Jan 2010 Location: Sonoma County, California Posts: 164 Rewards Points: 150 Thank you, Glad to here a confirmation from somoene else that the design is valid.
 01-12-2010, 03:39 PM #6 Member   Join Date: Jan 2010 Location: Sonoma County, California Posts: 164 Rewards Points: 150 Anyone else?? Any other designs? Thanks, Mike
 01-12-2010, 07:47 PM #7 Newbie   Join Date: Jan 2006 Posts: 4 Rewards Points: 10 Mike, Check out www.decks.com - they have some great tools for materials and structural calculations. How about using standard 5/4 decking for the deck surface?...that will give you a little more room for footings and beams Brian
01-12-2010, 07:58 PM   #8
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Quote:
 Originally Posted by canyonbc Thank you, Glad to here a confirmation from somoene else that the design is valid.
confirmation is for measurements not the design. You need to take into account loads= material plus lotsa people so how its -designed- needs to be looked at closely

01-12-2010, 08:59 PM   #9
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Quote:
 Originally Posted by brogeflog Mike, Check out www.decks.com - they have some great tools for materials and structural calculations. How about using standard 5/4 decking for the deck surface?...that will give you a little more room for footings and beams Brian
Thanks Brian, I will check it out.

01-12-2010, 09:01 PM   #10
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Quote:
 Originally Posted by tpolk confirmation is for measurements not the design. You need to take into account loads= material plus lotsa people so how its -designed- needs to be looked at closely
Well Thank you.

The city has the the city engineer sign off on everything to make sure it is code approved and will be "Strong" enough.

my main concern was the measurements line up and at least make some logical since to people and we do not go down the city and get laughed at.

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