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Waterproof storage under deck

DANL | Posted in Construction Techniques on August 2, 2004 12:55pm

A while ago, someone posted a question about how to waterproof a deck so they could store stuff under it. I looked, but can’t find the original posting to reply to, and he’s probably already done whatever he was going to do, but in the Lowe’s brochure in today’s paper, they have an “underdeck outdoor ceiling system” that consists of a corrugated sheet of plastic that seems to have channels under each joist. Could be a useful product if it works as advertised!

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  1. joewood | Aug 02, 2004 01:31am | #1

    Here are a few more Danno, just scroll down to the bottom.

    http://www.deckmagazine.com/resources.html

  2. e2canoe | Aug 02, 2004 04:50am | #2

    I was excited when I saw your post because I'm building a porch which will have decking - not T&G flooring - over a storage space below.  I've been trying to figure out how to keep the area under the porch dry (the roof will help but there is always blowing rain and melting snow in the spring).

    All the below-deck systems assume that joists are perpendicular to the house.  I built mine with joist parallel to the house so that my decking could be attached perpendicular to the house (looks nicer).

    If you or anyone has some ideas for a home-made below the deck drainage system that works with perpendicular joists, let me know.  If I figure out something and others are interested, I'll be more than happy to post pictures of what I end up doing.

    1. DANL | Aug 02, 2004 03:38pm | #3

      Good luck; look forward to seeing the pictures. Yeah, unfortunately, the stuff I described is used when the joists run perpendicular to the side of the house. I suppose you could nail 2X2 "furring" or "strapping" perpendicular to the joists and then put this product on. I'd use PT or maybe even one of the new composition products for the strapping.

    2. ronbudgell | Aug 03, 2004 02:16am | #4

      Can you hang corrugated roofing underneath the framing? It won't be very pretty, but it works. You hang it by fastening through 1 x 3, through the hills of the corrugations and into the framing. You build in a slope with tight screws on one end and slack screws on the other.

      Ron

      1. e2canoe | Aug 03, 2004 04:43am | #7

        Ya.  I thought of the same thing although I haven't seen that corrugated fiberglass stuff for a while - just the galvanized steel version (used for concrete slab support?)

        1. ronbudgell | Aug 03, 2004 02:58pm | #8

          e2canoe

          Now you mention it, I haven't seen it for a while myself. (Note to self: think before speaking next time.)  Of course I haven't looked for it either. There's always metal roofing although it costs the earth now. I have seen this job done like this. If your deck boards are fairly tight you won't accumulate a lot of junk up there. Some access for cleaning is a good idea, though.

          I've just been talking to a customer about waterproofing a deck. It probably won't happen but we were talking about tile over thinset over a plastic support and drainage membrane (Schluter "Troba") over concrete over ply on framing. Big money. I think it's crazy. I can't imagine it would stand up to the climate with frequent freeze-thaw cycles.

          Ron

    3. JohnSprung | Aug 03, 2004 04:07am | #5

      > below the deck drainage system

      I think you're just asking for trouble with that kind of thing.  It'll fill up with damp crud and cause rot, mildew, mold, termites, mosquitos, etc.  And how do you clean it out?  If you want it dry under the deck, make the deck water tight in the first place.

      -- J.S.

      1. e2canoe | Aug 03, 2004 04:41am | #6

        I had thought of using 1"x3" T&G Ipe decking but am chickening out.  I am worried about how the wood will react to water seeping between the groove.  Instead, I am thinking of just Ipe 1"x6" decking which means some water will drip below the porch.

        In general I agree with your philosophy.  I'll consider this carefully.

  3. Jeff | Aug 03, 2004 03:25pm | #9

    Maybe I'm lazy, but I installed some plywood sheets under my deck to store the lawn tractor and such.

    I screwed in a set of eyes to the joists.

    Screwes another set of eyes to the plywood.

    Hung the end closest to the house with 2 chain links and the far end with a foots worth.

    Water just rolls off, snow accumulates slightly.

    Otherwise, it works fine.

    I'll replace the plywood when it starts to rot.

    Jeff

    1. e2canoe | Aug 03, 2004 05:05pm | #11

      Not lazy.  Pragmatic.

      I think I'll try your method.  Maybe I'll use PT plywood so that it last a bit longer.

  4. Robrehm | Aug 03, 2004 04:27pm | #10

    The best answer I've seen for this, http://WWW.Duradek.com

  5. DanH | Aug 03, 2004 07:14pm | #12

    Isn't this why God gave us plastic dropcloths -- to drape over the stuff we don't want to get wet?

    1. Jeff | Aug 04, 2004 01:58am | #13

      Yeah, but he gave us wind and tiedowns.

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