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Old 12-01-2008, 01:06 AM   #1
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Composite deck building question


Hi everyone,
We're building a composite deck on the second storey of our home and are looking to keep the area beneath the deck dry. Our contractor suggested building a slightly sloped deck with a vinyl finish on top and then simply add the composite decking over that. I'm reading the installation guide on this stuff and it says it should not be installed directly on top of other material. It needs 2" of space, at least. Further, the instructions suggest using a nominal sleeper system? What the heck is that? Any suggestions?

Thanks!

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Old 12-01-2008, 04:04 PM   #2
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Composite deck building question


http://www.uslumber.com/Special_Applications.pdf

Even composite decks need to be able to dry out. What your contractor suggested is the easiest way to accomplish what you want to do but you will have to have some space between the vinyl and the deck surface.

Have you thought about putting down vinyl decking?

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Old 12-01-2008, 04:40 PM   #3
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Composite deck building question


I've used a composite called Geodeck a few times with good results. It's a hollow product, so it's not as heavy as the solid composites. The thing that might make it ideal for your application is that they make it in a tongue and groove. It's not totally dry, but it would be a lot drier than regular planks.

Just a thought...
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Old 12-01-2008, 07:33 PM   #4
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Composite deck building question


I would not do as your contractor says, he probably has no experience with this issue and you will probably have issues later down the road.

Look into Timbertech DrySpace or similar products.

http://www.timbertech.com/Products/DrySpace.aspx
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Last edited by curapa; 12-01-2008 at 08:22 PM.
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Old 12-03-2008, 07:23 AM   #5
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Composite deck building question


I suggest being very careful not to follow the manufacturer's installation instructions - it will void any warranty. Composite decks can have mildew issues - It is better for you to get wet than let the deck to stay wet

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Old 12-03-2008, 08:48 AM   #6
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Composite deck building question


Quote:
Originally Posted by Big Marino View Post
...Our contractor suggested building a slightly sloped deck with a vinyl finish on top and then simply add the composite decking over that...
He doesn't know what he is talking about. Do not listen to him, that is bad advice.

Quote:
Originally Posted by Big Marino View Post
...
I'm reading the installation guide on this stuff and it says it should not be installed directly on top of other material...
That is correct.

Quote:
Originally Posted by Big Marino View Post
...
It needs 2" of space, at least. Further, the instructions suggest using a nominal sleeper system? What the heck is that?...
It was covered slightly in the link posted for usLumber: http://www.uslumber.com/Special_Applications.pdf

A sleeper system is essentially building a substructure on top of another structure. Example: You have a flat-roof garage attached to a home, that you want to build a deck on top of. The garage's roof would be completed as a rubber system, or EPDM. This surface would be very slightly pitched/sloped to allow rain water drainage by gravity.

Deck: On top of that, another Structure would be built, made up of pressure treated lumber, to create the deck frame. This frame would be built almost level. To do this, would require the joists (sleepers) to be built in such a way as to offset the pitch of the garage roof under it. So they would be slightly tapered at one end to offset the slight pitch of the garage's "flat" roof.

Links:

http://www.decks.com/article304.aspx

http://www.ideas-for-deck-designs.co...top-decks.html

Quote:
Originally Posted by Big Marino View Post
...
Any suggestions?...
There are other methods for accomplishing a storage area underneath. There are also other systems made to create support for "floating" a deck ontop of an enclosed structure...
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Old 12-31-2008, 10:14 PM   #7
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Composite deck building question


First, do make sure you follow the manufacturer's installation instructions regarding space under the composite decking product. You can't lay composite decking directly over another material, and you should also be sure your contractor spaces the boards correctly. Otherwise, the warrantly will be void.
Second, if you are using composite decking manufactured by LP (Louisiana Pacific) there is a recall on some product. See their web site www.lpcorp.com and click on the orange box labeled "Decking Advisory." I used to work for LP and I know it was a manufacturing defect. The product is WeatherBest, ABTCo and some of the Veranda product sold through HD. The advisory will tell you exactly what production years are effected.

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