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Question DetailsAsked on 12/28/2014

My second floor bedroom window leaks when it rains heavy it puddles on the floor but the window seal is dry.

The water looks like its coming in from under the base board under the window the rest of the wall is dry as with the window seal the roof was replaced about 2 years ago but was leaking before that so i know the roof is in good condition Ive being in the attic to see if i could find any wet spots and couln't find anything how can i fix it myself or who should I call to fix it right

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There are several similar questions with responses right under this answer which might help.


Assuming you have looked outside to see that there are no obvious gaps in the siding or the flashing/caulk surrounding the window, then a window seal or window flashing leak does sound like the likely cause. If an opening window, get something to stand on (unless you are OK with climbing a ladder outside and have or can borrow one), and use a long-handled hand mirror (maybe taped to a stick or broom handle) to reach out the window and look around the outside of the window and immediate area for gaps in siding, missing or torn flashing, missing caulk or cracks between caulk and window.Also check window (opening units) for missing/broken weatherstripping or missing trip strips.


Destructively, you can drill/cut small holes in the wall and using a dry fingertip track the wet insulation upward till it is no longer wet - then look there for source of leak. Sometimes a failed window seal will let water down into the sill of the window and leak through window frame joints from there into the wall, but usually not enough to make it all the way down to the floor and come out at baseboard - that would normally indicate a pretty substantial flashing/caulk failure around the outside of the window or at the ends of the outer sill - usually at the top othe frame. (I am assuming this is not a new installed window, so probably not a fundamental error in how flashing was installed).


Another way you can track it is rent the thermal infrared camera at Home Depot or tool rental place or find a friend with thermal capable portable electronic device - Apple iPad's and at least newer iPhones have that capability to a limited extent but good enough to find a true wet zone, probably some other devices too - and look for a warm zone down the wall from the outside, indicating wet (so less effective) insulation.


One other thought - if only comes in during rain, then yeah you are on the right track. If wet/leaking all the time, considerif there is a water pipe in that wall, or possibly a leaking hot water baseboard or in-floor heating system.


Likely repair contractor Search the List category - Windows, though if just missing caulk at the top of the window then a Handyman can probably handle it.

Answered 4 years ago by LCD




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