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Seriously, I do not know what you mean by "a water problem." What sort of patio/balcony does that second-floor door open to? Is it pitched toward the door or away from it? Is there any sort of covering above the door? Usually "water problems" with exterior doors have to do with the surrounding area, not the door, itself. Doors are never meant to be watertight seals: they will always leak if water pools around or on them. It is possible that the seal just is not good, but if it keeps drafts out, then the problem is more likely with the surroundign area than the door or frame or threshold.
As for replacing the threshold, you sometimes can pry it out and slip it out from under the door frame. But it always depends on how it was installed: whether it was installed tightly under the frame or not under the frame, at all.
[This message has been edited by Lawrence (edited January 17, 2002).]
This problem has existed since I moved into the house three years ago. To try to resolve the problem, I have done several things, including replacing she sunroom roof with a new rubber roof, replaced the trim/molding around the exterior door, and installing a storm door. All of these things needed to be done regardless of the water problem. However, none of them fixed the problem. That is why I am now turning to the threshold...
I would suspect that the problem is not the door but instead the surrounding frame and seams between the frame and the siding. (Perhaps you already figured this out and just used the term "door" generally.) Some good exterior caulk to plug those seams might solve the problem. Also, check the top seam, which is hidden from view but gets hit with the most water. The leak might originate up there and then drip along the inner side of the door. You might be getting water inside every time it rains, but only seeing it downstairs when large volumes hit because only then does the "river" make it to the downstairs.
Also, check the drainage routes by using a hose (with a fine spray or a soft enouygh spray so you can see the natural drainage route) on and around the door to make sure water drains AWAY from your house, or at least away from the door. It is possible that the deck (even one plank of the deck if the planks run parallel to the siding) is directing water into the framing when those storms hit. It might just be subtle, but enough to get water inside when large volumes hit the deck, which is when yous say there is a problem. Sometimes, even a small glob of caulk can redirect the water into a small hole.
Finally, if you can't tell where the problem is from the outside, you might try cutting an exploratory hole in that sunroom ceiling to see where the water is coming from. This is somewhat of a last-resort because you will need to repair the hole, but it is much better than allowing the leak to remain, perhaps get worse, and create rather serious mold and wood rot problems. You will probably see some sort of indication where the water drips (mold or other residue). Sometimes leaks end up dripping far from where they originate. The water comes in at one point, works its way through the framing, and comes out somewhere else, completely. It might only be a coincidence that the leak ends up dripping where the second floor door is. Indeed, perhaps the carpentry for that door merely re-directs the water so that it drips right there when it actually comes from somewhere else.
[This message has been edited by Lawrence (edited January 18, 2002).]
[This message has been edited by Iceman (edited January 18, 2002).]