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Question DetailsAsked on 6/22/2017

Who can give me an estimate to repair water seepage on garage floor in my area 01077?

Water seepage spots on garage floor in several locations after rain. I extended the down spouts but still getting water on floor. Appears to be coming up through the concrete slab. My garage is at the top of a slope that goes down in back of the garage so I'm not sure exactly how this even occurs. Any suggestion? And who would I call for such a problem?

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You say you extended the downspouts - if they are not conveying the water several feet at least from the foundation - with splashblock, surface-laid piece of gutter (the plastic gutter works well for this), a ditch, etc. that may not do the job.

Check where the wetness occurs and then check outside (while still raining) to see if it is puddling against the house - almost certainly is, and coming in over the top of the slab. Maybe you need some ditching near the house to csarry the water away - and if water is impacting near garage (no gutters on part or driving rains) may need to put some clay or plastic sheeting sloping away from the foundation to stop the infiltration.

Also make sure the siding goes below the top of slab - some garages they end up shy on the siding so the rain runs down right on top of the slab or sillblock.

If you can't figure out where it is coming from and roof runoff is running rapidly away from the house on a slope, then I would be looking (if appearing at the perimeter of the slab) for leaking or open windows or leaking siding.

If using a buried pipe for the runoff, look to see if that is backing up underground to saturate the slab.

If popping up in middle of slab (not around perimeter) then has to be rainwater piling up against the slab, or remotely possibly a leaking or backing up floor drain pipe putting water under the slab.

I would also look during rain to see if it is coming in the garage door(s) - very common event, either through the panels themselves in driving rain, or running in on the slab from driveway or from rain falling/splashing on/near the bottom of the door. If coming under door, bulb type garage door bottom seal would be normal solution to stop most of it. For total stopping if coming in under door (assuming your vehicles have adequate headroom) a low sill under the door formed of grout can work well - chip to roughen a strip in the slab under the door seal contact area, mix some thick (biscuit mix consistency) cement or patching grout and put a ridge along the roughened contact area, cover with plastic sheet (saran wrap, flattened out plastic bags, visqueen vapor barrier, etc) and close the door on it and leave for 12 hours before opening door and peeling plastic off - don't drive on for at least 1 day and keep damp for 2 days minimum. (Closing door on it makes the bottom seal shape the grout to match and make a great seal).

If you and a friend or two can't figure this out, then a Basement Waterproofing contrator would be the normal Search the List category for help.

Here are a few links to related similar questions with answers FYI:

Answered 3 years ago by LCD

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