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Old 12-29-2010, 01:40 PM   #1
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Leaking water into under-garage storage room


Under my attached, 2-car garage is excavated into a storage room. Water drips from the trap of the garage floor drain into the storage room below. I can't tell if the water is coming from the drain & trap itself or if it may be going around the drain and running down the outside of the trap pipe and then dripping off at the low point.

Even worse of a scenario could be water leaking through cracks in the garage floor and running along the corrugated decking and escaping where the drain breaks through into the storage room.

Any troubleshooting suggestions, experiences, ideas would be great.

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Old 12-29-2010, 02:02 PM   #2
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Leaking water into under-garage storage room


Ayuh,... I suppose it could be any of the above,...
The only way to know is to LOOK...

Have somebody play a garden hose in the various areas suspected, while you observe....

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Old 12-30-2010, 10:58 AM   #3
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Leaking water into under-garage storage room


If you were talking about a room beneath a shower, your suspicions about the source(s) would make sense. There is too much unknown about the layout and structure of your home to offer good troubleshooting advice, so I offer the following instead:

1. Does water collect around the perimeter of the garage, say from downspouts or other runoff?
2. Is there at least a 6 inch drop in the first 10' out from the house/garage?
3. Is there a french drain adjacent to the garage foundation wall that is below the level of the garage floor pan?

I suspect that there is infiltration around the perimeter of the garage which then flows along the pan and is much more likely than penetration through the floor or around the drain unless you frequently flood the garage.

Hope this helps.
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Old 12-30-2010, 12:46 PM   #4
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Leaking water into under-garage storage room


These are extremely tough to trouble-shoot. Water can travel a long ways before leaking in a situation like this. My bet would be that it's surface water from vehicles on the floor above. Cleaning every control joint and crack, as well as grinding a relief around the drain itself, and then coming behind with a self-leveling joint filler (Sika is good and easy to find) would be my first step in remediating the problem.
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Old 12-31-2010, 06:18 PM   #5
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Leaking water into under-garage storage room


I'm going to troubleshoot tomorrow with the hose and try to isolate where the leak is happening. I'll post again with results.
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Old 01-01-2011, 06:39 AM   #6
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Leaking water into under-garage storage room


getting some dye will help you locate the source - same stuff plumbers & septic tank people use.

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