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Old 07-29-2009, 11:08 PM   #1
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Composit wood over concret patio


Hi
I bought a bunch of Eon composit wood fo rmy outdoor patio.
This type of decking uses a wing clip screwed to the frame of the deck.
The problem is I want to install this directly over the concret floor. screwing a few hundreds of these over the concrete is impractical.
I was thingking about using thin set as what they use for the tiles and use glue for the wing clips.
the boards are 16 and 20 feet long. the patio is around 10x20
I figured once they are thin set together they are not moiving anywhre
I would like to hear some expert opinions please
thanks

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Old 07-30-2009, 07:32 AM   #2
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Composit wood over concret patio


You want to thinset composite decking to concrete?
What make you think the composite will stick with thinset?
Thinset is not a glue, its made for a specific purpose
In addition I'd be willing to bet that the composite in direct contact wioth cement will fail VERY quickly

Attach PT wood 16" OC to the cement& then screw the composite to that
Even with the 1.5" air space you will not have a lot of air space for ventilation

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Old 07-30-2009, 08:12 AM   #3
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Composit wood over concret patio


Thank you Dave
The different between the patio and the house is 4". I was thininking about making a frame using 2x4 PT wood but using the 2" height. Then attach the composite to the frame.
A few guys at Home Depot suggested to use thin set to GLUE the composite which I have some DOUBT that's why I came here
Thanks
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Old 07-30-2009, 08:23 AM   #4
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Composit wood over concret patio


Ah, HD strikes again
Laying the boards flat will give you 1.5" of clearance over the concrete
I's consider getting 2x6's & ripping them in 1/2 & laying flat or on edge
A 2x4 laying flat would give you 3.5" of wood in contact w/cement
A 2x6 cut in 1/2 laying flat will give you 2.75"
A 2x6 cut in 1/2 on edge it would only be 1.5" in contact with cement
But that would then be a height of 2.75" + 3/4" deckboard = 3.25"
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Old 07-30-2009, 09:46 AM   #5
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Composit wood over concret patio


Dave
Thanks again
I was thinking I have to make a grame regardless
2x6 and cut in half make more sense. it is eaiser too as I have to remove the slate tiles and with the frame I dont have to make the floor too even
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Old 07-30-2009, 10:10 AM   #6
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Composit wood over concret patio


I think it's a crazy idea. You're going to have a science experiment going on under those planks, the area will never dry. Chance are some of those PT will buckle too.

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Old 07-30-2009, 02:52 PM   #7
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Composit wood over concret patio


Hi
I am not worry about dryness. Here in Texas the place will dry up even in the winter. I am more concern about the smell. My dog has a hibit of leaving pee pee in the patio
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Old 07-30-2009, 02:56 PM   #8
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Composit wood over concret patio


Ah Texas.....
Myself something that low I prefer just pavers
I do have one deck out back that I rebuilt from someone pool deck
Its pretty enclosed underneath with the surrounding framing
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Old 07-30-2009, 03:19 PM   #9
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Composit wood over concret patio


Dave
I was going to replace the slates with tiles
I just bought these 500sf of eon composit at a great price so i thought maybe an outdoor patio with wood looking would be great

What is your final opinion? Maybe I keep the compsite for another deck

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