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Old 04-27-2012, 09:42 PM   #1
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Tenants thrashed my deck. . . need to rebuild (span questions)


It wasn't in the GREATEST shape, but I lived there for so long and I never had boards breaking on it.

Anyway, I don't really know what the condition of the frame of the thing is so i'm planning on just redoing it.

Can someone tell me the max span for a P.T. 4x6 and a P.T. 2x6?

From there I should be O-K.

Thanks in advance.

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Old 04-27-2012, 09:57 PM   #2
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Tenants thrashed my deck. . . need to rebuild (span questions)


4 X 6's should never be used as a horizontal floor joist or ledger board.
Just Google floor joist spans for your ansewers.

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Old 04-27-2012, 10:04 PM   #3
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Tenants thrashed my deck. . . need to rebuild (span questions)


Quote:
Originally Posted by joecaption View Post
4 X 6's should never be used as a horizontal floor joist or ledger board.
Really?

What about 2x6's ? I'm pretty sure that's what it's made out of already.
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Old 04-27-2012, 10:24 PM   #4
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Tenants thrashed my deck. . . need to rebuild (span questions)


about 6' for the 2x6... a lot of codes don't even recognize 2x6 for use in floor joist applications.
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Old 04-27-2012, 10:28 PM   #5
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Tenants thrashed my deck. . . need to rebuild (span questions)


http://www.awc.org/calculators/span/...rcalcstyle.asp

Two 2 X 6's will have more top load strengh then one 4 X 6.
A 4 X 6 will almost alway sag.

Sure would be nice if you could post a picture.
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Old 04-27-2012, 10:52 PM   #6
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Tenants thrashed my deck. . . need to rebuild (span questions)


We can't even begin to answer such a question. There are numerous variables that go into determining the spans of beams and joists in a deck. It's like asking: how much will it cost to ship a five pound box. To where? How quickly do you want it to get there? What size box? Which carrier (UPS, USPS, or FedEx)?

Beyond the lumber size, you would need to provide lumber species, lumber grade, loads, joist spacing, etc.

You'd also have to find someone willing to invest the time to crunch the numbers for you... ;-)
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Old 04-28-2012, 07:59 AM   #7
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Tenants thrashed my deck. . . need to rebuild (span questions)


Most decks are "designed" by simply following code, which is often the International Residential Code (IRC). Your building inspector can tell you exactly what code you need to use, and may even have a copy of the "prescriptive Residential Wood Deck Construction Guide", which tells you everything you need to know about allowable spans, minimum lumber size, design of posts, footers, railings, stairs, ledger boards etc.

If you do not need a permit, or elect to proceed without filing for a permit, you still need to decide if you are going to build to code. If you are not planning to build to code, then you have to perform mathematical computations to determine the required structural element sizes. But this is almost never done for simple residential projects, costs too much money to hire an engineer or architect, most everyone gets a copy of the code and just follows it, whether they actually pull a permit or not. I recommend you do the same, although I strongly urge you to get a permit if required. Asking for someone on an internet forum to size structural elements for your deck, in your location, is unworkable, since your local code will always control.
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Old 04-28-2012, 12:44 PM   #8
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Tenants thrashed my deck. . . need to rebuild (span questions)


Alan,

I've attached a link for the American Wood Council's Prescriptive Residential Wood Deck Guide. This will provide you guidance for the proper construction. I would also advise you to contact your local building official, they may have a deck construction guide for use in your jurisdiction. You should inquire about seismic requirements since you are in California.

http://www.awc.org/publications/DCA/DCA6/DCA6-09.pdf

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