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Old 01-24-2014, 08:59 PM   #1
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Attach 4x4 post to 2x4 beam?


I'm building a small platform that will raise my outside A/C condensers off the ground. My area floods bad in in heavy rain so I am planning on raising them on the platform only about 2' just to keep them safe and dry.

At any rate, I built the frame out of 2x4's with a frame size of 4' x 8' as I am planning on using one sheet of pressure treated plywood for the top. I used joist hangers to attach the three smaller 2x4 joists to the longer 2x4 outside edge frame beams. My question has to do with installing the 4x4 legs/posts. I have planned on using six 4x4 posts (three on each long side). I am a little confused though on how I should attach them and what tie I need to use to attach them with. If I put 4 in each corner, how am I supposed to attach it to the frame? Also, I will need to attach the other two in the midsection of the frame. What tie am I supposed to use for that?

I had been looking at Simpson BC postcaps until I realized those appear to be used to tie a 4x4 to 2-2xs or 3-2xs or a 6x. Then I found the A35 Framing Anchors, the DPT6 Deck Post Tie, the DJT14Z Deck Post Tie, etc.. My head is swimming.

I have attached two images. One a simple Sketchup model of what the top looks like. And the other a picture of the bottom of the frame of one of the corners. The plywood will attach to the other side of the frame as shown in that picture.




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Old 01-24-2014, 10:36 PM   #2
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Attach 4x4 post to 2x4 beam?


Why not nail a chunk of 2x4 inside the corner? Then you can use the Simpson post cap.

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Old 01-24-2014, 11:53 PM   #3
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Attach 4x4 post to 2x4 beam?


Plywood's not going to work.
Use pressure treated 5/4 X 6 deck boards instead.
You'll soon find out it's going to delaminate and rot from lack of drainage.
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Old 01-25-2014, 06:20 AM   #4
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Attach 4x4 post to 2x4 beam?


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Why not nail a chunk of 2x4 inside the corner? Then you can use the Simpson post cap.
Yup I thought I was over thinking the problem. Something that simple didnt even occur to me. Thanks!
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Old 01-25-2014, 06:24 AM   #5
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Attach 4x4 post to 2x4 beam?


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Plywood's not going to work.
Use pressure treated 5/4 X 6 deck boards instead.
You'll soon find out it's going to delaminate and rot from lack of drainage.
Are talking about the drainage from the A/C condensers being the problem? I can have my HVAC installer route that condensate over the edge of the platform so it doesnt discharge on the platform itself.

Or are you talking rain water laying on the top being a problem. I assumed it being treated it would easily outlive the A/C units.
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Old 01-25-2014, 07:28 AM   #6
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Attach 4x4 post to 2x4 beam?


conc blocks & 1 precast a/c block from apron/vest store & you're done w/no worries about fasteners OR rot
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Old 01-25-2014, 07:38 AM   #7
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Attach 4x4 post to 2x4 beam?


Both condensate, and rain will destroy it.
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Old 01-25-2014, 07:51 AM   #8
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Attach 4x4 post to 2x4 beam?


I would use deck boards over plywood too. Cheaper, stronger, better drainage. Using hangers in wet locations could be an issue too. Me, I would notch out an inch X 3 1/2 inch cradle on the top of the 4x4 posts and use galvanized lag bolts and washers to secure the 2X4 in position.
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Old 01-25-2014, 08:07 AM   #9
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Attach 4x4 post to 2x4 beam?


Alright, I'll scrap the plywood idea and go with PT deck boards. Since I have already built the frame/joists for plywood design, I'll just have to lay the deck boards length wise across the frame instead of the standard width wise way to do it.

I purchased the Z-Max fasteners/hangers from Simpson that are made for deck building so I would hope they should hold up outside for many years with no issue.
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Old 01-25-2014, 08:09 AM   #10
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Attach 4x4 post to 2x4 beam?


Lets make sure what you just typed is clear to the O/P Pole Cat.
"I would use deck boards over plywood too"
Just decking boards, not both.
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Old 01-25-2014, 08:16 AM   #11
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Attach 4x4 post to 2x4 beam?


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Originally Posted by joecaption View Post
Lets make sure what you just typed is clear to the O/P Pole Cat.
"I would use deck boards over plywood too"
Just decking boards, not both.
Yeah, I did a double take on that too. I assume when he says "over" he is meaning "in place of".
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Old 01-25-2014, 08:37 AM   #12
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Attach 4x4 post to 2x4 beam?


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Yeah, I did a double take on that too. I assume when he says "over" he is meaning "in place of".
Sorry, that was sloppy writing. More coffee is indicated.
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Old 01-25-2014, 09:48 AM   #13
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Attach 4x4 post to 2x4 beam?


Carriage bolts maybe?

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