Durock/concrete texture questions

Okay, here we go again. Trying to make the best of a previous owner's "bright" idea. This time they decided to build a wall out on the back deck (closed in part of the screen enclosure) out of regular drywall. What happens to drywall when it gets wet? Yes! Okay, there's one of my issues. Tearing down the wall entirely is out of the question right now, but I'm redoing much of it with durock. Now, the durock is going to meet the floor (chattahoochie in that location). What's the best method for getting a good seal on the joints? BTW, I plan on covering it with stucco after it's up.
Also, much of our back deck is Sundek. We recently ripped out some cabinets and a countertop constructed of matchsticks, scotch tape, and blue beads, (I won't even mention the bare electrical wires sitting in the wide open) and it left areas of the floor that were not given the Sundek treatment. Is there any type of spray concrete texture out there? I'd like to try to match it to the texture on the rest of the deck. It's only 15 sq ft of space I'm trying to work with on the deck portion.
Thanks, all. I know the details are kind of sketchy. Just trying to make the best of a bad situation until the time comes when we can rip it all down and do it the right way.
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What are you sealing it for? Bugs? Moisture? Appearance?
I assume the deck boards have gaps.
Colbyt
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Moisture. I'm thinking of just running a bead of silicone along the joint and then letting the stucco go right down the floor.
Will the stucco adhere to the durock or must I use a wire lath?
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Your silicone should be fine. Keep the bead tight. I'm not sure the stucco will adhere to the silicone.
A thin coat of stucco should stick to the wonderboard with no problem. I'm don't think this is an approved use of wonderboard so I'm not sure how long it will last. I just did something similar so in a few years we both will know.
For what it is worth I kept my stucco coat to about 1/4" or less and had no problems getting it to stick to hardiebacker. I should have misted the board before I applied the stucco. I suggest that to you. With mine being dry it tended to pull the moisture out of the stucco too quickly. On a larger area I could have gotten into some serious problems.
Colbyt
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Okay, good tip about the misting. I hadn't thought of that. No, the stucco won't adhere to the silicone, but it will adhere to what's above it and below it, so it should cover it okay.
So far I've replaced any rotted wood, framed out the bottom of the wall, and put up a vapor barrier. The durock will go up during the week as I get the time.
Agreed, this is definitely not an approved use of durock. For what it's worth, it definitely was not an approved use of regular sheetrock, but that seemed to have stood up for 15 or so years before it finally gave up the ghost. I'm sure the durock should hold up at least that long. We've decided that the next time this thing falls apart, the entire wall and adjoining storage room will come down and be rebuilt the right way. I've seen so many shortcuts and botch jobs done in this house. It's really a shame that people don't take the time to do things correctly.
Thanks for tips.
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