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Old 12-28-2009, 03:47 PM   #1
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Wood deck over a concrete patio

This is my first time posting and hopefully you can help. My wife and I recently bought a new townhouse. It is on the second story above a store. In back it has a concrete patio, I would like to cover this with a wood deck. I was planning to build a frame similar to a wall with pressure treated 2x4's and cover with cedar decking. I don't want it to be much higher then the 2x4's and decking due to an existing railing. Will this work, and I live in an area that gets a lot of rain. Is the pressure treated 2x4's enough or should I wrap them? Thanks Matt
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Old 12-28-2009, 04:51 PM   #2
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A concrete patio on the 2nd floor ?
A 2x4 deck frame on top of the concrete will work
The concrete will retain some moisture longer once it is covered with decking
But since this the frame will not be structural as far as holding weight I don't see a big problem
The concrete will still provide all of the support

One issue, if the decking has gaps between the boards & you drop something - like a key - it might be a pain to retrieve

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Old 12-28-2009, 05:30 PM   #3
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The concrete is likely sloped for drainage, so be aware when you go to build in top of it - things may not line up exactly without some adjustment.

Suggest to leave the downward / outward end open for water to run off out from under the decking - don't make a dam for water to accumulate against and sit.

Resting the sleepers or however you are going to build it on a modified post base might be an idea - something thin to hold the deck underpinnings from direct contact with the concrete.
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Old 12-28-2009, 05:45 PM   #4
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Check with your Local Building Department. Your railing will be too short, the attachment of the sleepers need to be addressed, and the liability over a commercial building is important. Your Homeowners Insurance carrier will need to be informed for coverage.

Be safe, Gary
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concrete , deck , wood

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