Cut a hole in the floor where you want the water to drain and then dig a trench outside so that it lines up with where you cut the hole. Run a 3/4 inch PVC pipe with the hose under you slab until you get to the hole. Sometimes you have to add pipe together, but that’s easy with glue.Click to see full answer. Accordingly, can you put a drain in your garage?A garage can be a messy place, and keeping it clean is much less complicated if you can simply wash down the floor and allow the water to run into a floor drain. While it is best to install the drain during the building of the garage, you can also retrofit an existing garage, although it is considerably more difficult. how do you install a drain in an existing concrete floor? A plumber, or yourself, will dig out the dirt from the trench and install the drainpipe making sure it has the proper pitch. The drain will be installed flush with the existing floor. Cover the pipe with the dirt you dug out and use a hand tamper to compact it. Leave about 4″ to fill the trench with new concrete. Hereof, how much does it cost to install a drain in a garage? Installing drainage runs most homeowners between $1,886 and $5,488 with an average cost of $3,677. Small, simpler solutions could be as low as $800 and more complicated projects could get as expensive as $8,000.Where does the drain in my garage go?Most home garage floor drains go to sanitary sewer, not storm sewer unless they’re really old.

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