Water leaking at top of glass slider

Old 12-22-05, 10:16 AM
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Water leaking at top of glass slider

After about 5 weeks of dry weather with temperatures in the 30's, it has started to rain again here in Beaverton, Oregon. After a couple of days of good, hard rains, my wife noticed a small stream of water running down the inside of the glass slider. We live in a 3-story townhouse and have never had that leak before.

The slider and all the windows seem to be of a good quality vinyl but there may be some question about the quality of the calking at the top of the slider. Hopefully, this is where the leak is coming from and can be easily fixed.

Any other ideas or comments?
Old 12-22-05, 04:31 PM
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Water leaking inside the home from the top of a window is almost always due to a combination of improper window installation and water infiltration behind the siding.

Many contractors commonly slap their new construction windows right onto the building paper, nail off the nailing fins and then slap in the next window. Unfortunately, any water that makes its way onto the building paper will run right behind the nailing fin of the window and will usually drip from the top of the window where the interior trim or extension jamb meets the window.

To keep the window from leaking, you would have to remove the siding around the window, cut a flap in the building paper which you would fold up temporarily. Grace Vycor or a similar peel and stick membrane would then be applied over the side nailing fins, then a piece would be applied over the top nailing fin and directly onto the sheathing. The building paper would then be folded back down and the edges of that flap would be taped. This would seal up the top of the window so that it would no longer leak. It would not, however, fix the source of the leak.

If you have vinyl or steel siding, water commonly gets behind the siding and runs on top of the building paper... that is just the nature of that type of siding. Not sure what type of siding you have, but it could be that water is coming in from far above the window that leaks... your window is just the point at which it's showing up. I'd do a little detective work, and look for something directly above the window which might be the source of the leak... another window or a deck ledger perhaps, that would be 1 story up from the window that's leaking. The following thread refers to a gentleman with that problem. (http://forum.doityourself.com/showthread.php?t=245955)

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