fasten treated lumber direct to concrete patio


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Old 05-07-12, 08:06 AM
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fasten treated lumber direct to concrete patio

Hi,

I have an existing concrete patio that I want to cover with 5/4 treated lumber. Can I fasten the treated lumber direct to the patio so that the wood is in direct contact with the concrete?

The patio isn't enclosed so it will be exposed to rain.

Thank you!
 
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Old 05-07-12, 08:57 AM
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Welcome to the forums.

Don't do this. Respond back with what you're trying to accomplish and we'll get you pointed to a good solution.
 
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Old 05-07-12, 09:05 AM
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Make sure any fasteners or plates are the appropriate types ot materials for contact with treated wood. The treated wood is well known for eating up the wrong metals. This could have an effect on your planning or concept once you have one to present for opinions.

Dick
 
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Old 05-07-12, 12:51 PM
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Hi,

Thanks to everyone for your responses.

Mitch,

What I am trying to do is install a treated lumber deck on top of my current 14'x24' concrete patio.

Any help is greatly appreciated.

Thanks to all
 
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Old 05-07-12, 12:57 PM
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Under your deck must breathe, so you shouldn't just fasten wood to concrete. I would build the deck on 2x4 PT sleepers, offset for rigidity. Leave the end of the deck open for air to pass through. It will raise the deck 4 1/2" higher than the concrete. Is that a viable option?
 
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Old 05-07-12, 05:10 PM
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leave room for deck to breath

Thank you Chandler,

Yes that is an option, what fasteners should I use? I'm assuming that the 2X4 should be stood on end, ie, place against the concrete on the 2" side and space every 18".

Thanks again.
 
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Old 05-07-12, 05:30 PM
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I'm sure Chandler has a reason...but I sure don't know why you wouldn't put the long side (3 1/2") to the 'crete...that would raise it 1 1/2" plus the 1 " for the 5/4 decking total of 2 1/2".

Seems like it would be easier to attach to the 'crete, plenty of meat for fastening the decking and plenty of airflow? Would also give a bit more support than the short side?


Here's one question...how does the patio drain right now...is it sloped correctly?
 
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Old 05-08-12, 03:20 AM
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Yeah, I was thinking the length of the deck and more ventilation. You could do as Vic said and make a Pallet deck with the lumber on it's side, but I just like to reduce the exposure of wood-to-concrete, and standing on edge does that. In essence, I would only attach a couple of cleats along the ends, inside the beginning and ending 2x4 where the decking begins to hold it ALL in place. A deck this size ain't going anywhere. Using a couple of cleats you eliminate the need to drill or fasten the deck to the concrete along it's run.
 
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Old 05-08-12, 08:22 AM
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treated deck

Thanks to everyone for your responses.

The patio does drain properly. I was thinking of using tapcon fasteners that are rated for treated lumber. If I could lay the 2 x 4's on their side I wouldn't have to buy any expensive galvanized angle fasteners @ $2.50 apiece.

Am I correct that the 2 x 4's would need to be spaced every 18" to provide adequate support for the 5/4 decking?

Again thanks everyone.
 
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Old 05-08-12, 11:35 AM
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Are you talking on 18" centers? or an 18" gap?
Normally the floor joists go on 16" centers but since you are using the 2x4s laid flat, 18" centers should work ok. 16" centers works out well for decking lengths.
 
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Old 05-08-12, 01:35 PM
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how to fasten the deck

Chandler it sounds like you don't think every 2 x 4 needs fastened to the concrete? This would save alot of time.

Thanks again to everyone
 
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Old 05-08-12, 02:51 PM
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My opinion only. Your deck will weigh a kazillion pounds. Where will it go? If the beginning and ending joists are fastened to the patio using a cleat (short 2x4) tapconned to the patio and screwed to the joist from the outside, it isn't going anywhere. 2x4 perlins at the midpoint will help the rocking sensation that may develop over time with loosening fasteners.
 
 

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