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Xenix
Feb 21, 2003
Solving water intrusion problems cheaply isn't usually an option, especially if the interior grade is below exterior grade. Depending on your soil conditions, a sump with a pump as described above is only likely going to help locally around the sump pump (especially if the soil is clayey or silty).

Since the landlord doesn't seem to care, just dig a trench around the inside of the garage where it's wet (preferably at least 12 inches deep), line it with filter fabric and set a perforated PVC pipe (perforations down) in it, sloped to drain to a sump (similar as described above), and then fill the trench with clean gravel (leave it 3-6 inches lower than the finished grade). Lap the fabric over the top of the gravel so it doesn't get contaminated with fine material. Put back a 3-6 inch soil cap on top of the fabric.

The materials for this (except for the pump) are all relatively inexpensive, but there is a decent amount of labor needed. A decent sump pump is $250-400, but if you line everything with filter fabric, including the sump pit, you can probably get away without a pump that can pass decent sized solids.

Xenix fucked around with this message at 18:20 on Sep 6, 2021

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Xenix
Feb 21, 2003

SpeedFreek posted:

In the late 90s the inside of my basement was trenched and a sump put in, in a walk out basement it was still a ton of labor.

Digging is no fun, but if it's a standard sized 2 car garage, it'll probably be about 2 yards of soil. It's not nothing, but you could probably get the digging done in a day if you've got the right tools and technique. Or by hiring a day laborer.

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