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Question DetailsAsked on 10/21/2015

I have water in my garage and was told by plumber it is not a broken water pipe. Garage never is dry.

Floor and side walls of garage wet. Noticed some erosion on concrete. Don't know where water is coming from. I recently had a new roof and gutter guards put on my house. Leak was there before but now even worse. Who do I call to get this problem resolved.

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If certain it is not a pipe leak, then has to be coming from outside - if not wall or ceiling wetting or staining, then presumably from roof runoff, surface water, or groundwater infiltration. General principle is FIRST do everything within reason to keep water away from the house (and drain roof runoff well away from the house), second handle water in the ground at the foundation with basement exterior waterproofing and sometimes french drains, then if all else fails or water is groundwater coming up under the slab, install interior subfloor drainage and sump pump to remove it.

Obviously, if only during/after rains, then is roof runoff or rainwater (or possibly rising water table) causing it - if all the time, then has to be water coming from (on your property or neighboring) a constant source like high water table, leach field or sewer or artesian well leaking back to house, leaking pool, constant irrigation/lawn watering, orinflow from adjacent drainage features or stream.

You can find a lot of prior questions with responses on this issue in the Home > Basement Waterproofing link in Browse Projects, at lower left. Read through some, especially the ones with itemized lists of causes and solutions, so you are somewhat up top speed on the basics BEFORE you talk to a contractor.

Your Search the List category would be Basement Waterproofing (unless due to roof runoff or water coming down the drive) - talk to several contractors before arriving at a plan, and bear in mind your solution might be incremental - try a simple, inexpensive solution first if the flooding is minor, then transition to the full ball game only if it continues to be a major problem. In a vast majority of cases, controlling surface waters will solve the problem unless it is seasonal or year-around high water table because you are in a low spot, in which case full garage wall exterior waterproofing combined with an under-slab or perimeter drainage system and sump pump might be needed - but in a garage situation this would be rare, because usually (unless built deep into a hillside) the entry low-side would drain naturally enough to prevent major problems.

Bottom line - since you say worse now after new roof and gutter guards, assuming the new roof did not change the roof geometry, the gutter guards and/or gutters/downspouts are likely the culprit. The gutters should not allow water to fall or flow near the foundation - so look at your gutters in a heavy rain and see if overflowing because of poor slope or undersized downspout, overflowing because the gutter guards are not letting the water into the gutter (this is a chronic problem with gutter guards and a reason I recommend against them), and that the water coming down the downspouts is directed at least 3 feet away from the house (in clayey/silty soil) or at least 6 feet (in freer draining soil) and directed to a spot (with swales or berms, or french drains if absolutely needed) that will prevent it and surface water from getting close to the foundation walls.

Answered 5 years ago by LCD

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