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Old 06-23-2012, 12:03 AM   #1
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Unorthodox deck posts


Hey guys I am building a deck and using something odd for posts because the deck is so low to the ground.

Before you judge and say "it won't work" please listen and think about it first.

It's a 21x16 deck with a 9x3.5 ft notch out of it at the house, 12 o.c.

4 posts along the front (14 ft from house) with a 2ft cantilever and 3 posts 5.5 ft from the house and a 2x8x12 ledger to the house.

Now the posts are 3 ft of concrete with a 5/8 stainless steel threaded rod set in it. 11 inches sticks out of the concrete and I am building 21 ft beams out of triple 2x8, placing a nut at the bottomof rods, then 4x4 steel plate 1 inch thick on top. Then the beams will have 5/8 holes drilled, placed over the rods and then another plate and nut on top.

Just thought I would share my fully adjustable deck design.

Each 5/8 rod hold 1810 lbs I've read. multiplied by 7 is 12000 lbs...so weight should not be an issue

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Old 06-23-2012, 12:09 AM   #2
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Here its the drawing


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Old 06-23-2012, 12:39 AM   #3
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Was there a question in there? Certainly a different approach to a deck structure.

When you say low, how low? Are your 3' concrete posts partially submerged or is that 3' sitting on footings of some sort??

You say it's fully adjustable ... but if it's attached to the house how does that work or do you mean purely to get it level during construction? In terms of structural strength I agree that vertically it is probably very strong, but wondering if there is naturally a week point where the 5/8 steel exits the concrete and then enters the beam ... so laterally that could be weaker than a conventional post. Not saying it is ... just wondering (I have an engineering mind/degree so these things float around in the empty spaces in my head now and again)
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Old 06-23-2012, 12:47 AM   #4
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The question was just really "hey all here is my design, please dissect it"

There are a few things floating in my mind as well, hence I posted this

I agree about your concern on the lateral part of it. I was concerned about drilling a 5/8 hole through my beams to be honest.

what I meant by fully adjustable was yes during construction and if something sags or lifts a few inches over time as well.
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Old 06-23-2012, 12:49 AM   #5
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The 3 ft concrete posts are 1 inch above grade...that's how low lol
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Old 06-23-2012, 12:52 AM   #6
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If you were using a solid beam you would be fine. But with triple 2x8 more then likely you will be drilling a 5/8 hole all the way through the center 2x8 and that doesn't jive. Why not just get a simpson column cap and put that into the concrete?
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Old 06-23-2012, 12:54 AM   #7
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http://www.strongtie.com/products/co...TQM-ECCLQM.asp
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Old 06-23-2012, 01:00 AM   #8
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Never even knew those existed. It's too late now though posts are poured and set...

You think the 3 or four holes will seriously harm the integrity of the beam?
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Old 06-23-2012, 01:05 AM   #9
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In my mind you basically have a double 2x8 spanning 6' which is technically fine.. I hadn't realized you already had the concrete poured.
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Old 06-23-2012, 01:20 AM   #10
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Ya triple 2x6 in the front and triple 2x8 in the middle
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Old 06-23-2012, 01:35 AM   #11
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Now it's a triple 2x6 at the cantilever side ! yikes, you're pushing it now lol! Still with a 6 foot span between post you should be fine. If you haven't set the beams over the allthread yet.. Promise to drill exactly a hole with a 5/8'' bit and not a 1'' bit so the beam slides on easier. ha ! Next time go with the Simpson cap though. Good luck!
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Old 06-23-2012, 09:21 AM   #12
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Should have just poured the piers to 1" shy of the beams and used a typical post base, then the beams are resting direct on the post base on the concrete pier.
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Old 06-23-2012, 09:25 AM   #13
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Quote:
Originally Posted by sannitig View Post
Each 5/8 rod hold 1810 lbs I've read. multiplied by 7 is 12000 lbs...so weight should not be an issue
What's your loading requirement for your codes? if it's 55 lbs (40 LL, 15 DL) a sq ft then you've overloaded those rods... I calcd one of the piers and it needs to be capable of supporting over 1,900 lbs.

Sometimes it's better to ask BEFORE doing.

BTW what did the building department inspector say?
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Old 06-23-2012, 09:44 AM   #14
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Sorry what's 40ll and 15dl? stand for?
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Old 06-23-2012, 09:49 AM   #15
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Quote:
Originally Posted by sannitig
The 3 ft concrete posts are 1 inch above grade...that's how low lol
What are they sitting on?

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