Building Trex porch over concrete porch? With PICTURES.


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Old 04-10-14, 11:32 PM
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Building Trex porch over concrete porch? With PICTURES.

I want to build a Trex porch over this concrete one. In the red you can see a VERY rough idea of how to secure the Trex boards. In red would be buried posts and a cross beam between the two in which the Trex would be screwed to. To keep moisture off the concrete I would install a barrier between the concrete and the Trex. Any ideas on this project? THANKS!
 
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Old 04-20-14, 01:26 AM
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Dumb idea?

Apparently this project isn't realistic enough to try.
 
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Old 04-20-14, 04:42 AM
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How would you attach the decking to the concrete? A plastic barrier between the concrete and the decking would likely trap more moisture. I don't know much about composite decking but I can't see how your proposed job will last long. IMO dressing up the existing slab with stone or tile would be a better option.
 
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Old 04-20-14, 08:53 AM
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Not going to work for many reasons.
Composite needs air flow on all sides of it. (read the install manual on line.
Tap-Cons are not going to hold in failing concrete.
There's not going to be any way for the water to drain off of the stoop.
Composite expands and contracts, so the screws will work there way loose.
 
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Old 04-20-14, 05:18 PM
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I'd spend my time and money on getting the concrete stoop repaired before thinking about covering it with anything. Trex is not a practical choice for covering concrete, for the reasons given by others.
 
 

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