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Slab Leak Repair


Advanced Foundation Repair trained estimators use data collected during a foundation evaluation to spot slab leaks and review if a slab leak repair is needed.  Advanced also has its own full service plumbing affiliate.  This is important for two reasons.  First, we can help identify and locate leaks which may mean that foundation repairs are not needed.  Second, it means that once foundation repairs are completed, we can rapidly respond to any plumbing issues caused by foundation repairs.


Under slab leaks generally come in two forms, sewer leaks and leaks in water lines.  If your water lines are leaking, you usually find out as soon as you get you get your water bill.  Even a pin hole in a water line can leak out over 10,000 gallons in one month.  In contrast, sewers can leak for years without anybody knowing.  Unless a sewer is in expansive soils and a leak is adding enough water to swell the soils, there may be no signs of the leak. When a water line or a sewer line leaks enough water into expansive soils, the soils can actually swell up and lift a building.  This is called heaving.  Often when a leak is causing heaving, the presence of the leak may be suggested by the way the overlying slab is being bent.  Domes in slabs often indicate the presence of leaks.

Of course, once a foundation begins to move, all sorts of cosmetic damage can appear.  In some cases, the damage can indicate the presence of a leak under the foundation.  The shape and location of the damage can be a good indicator. At Advanced Foundation Repair, all of our estimators are trained to prepare contour diagrams, which helps them to spot slab deformations that are typical of plumbing leaks.  Estimators are also trained to correlate foundation damage with slab deformations, which helps to get an even better fix on slab leaks and the need for slab leak repair.


For water lines, there is a simple two step test.  First a pressure gauge is attached to a spigot and the spigot is opened.  As long as all water use is stopped, the gauge will show the pressure at which water is delivered from the street.  Next, the water meter is turned off.  If there are no leaks, the pressure on the gauge will remain constant.  If the pressure falls, it means that water is escaping from the lines in and under the house. 

Generally, if a pressure drop is found, taps, toilets, and other water outlets are rechecked for drips or slow use.  If no drips or slow use, such a running toilet, is found, then the lines must be leaking under the house. For sewers, there is also  simple two step test.  First, the sewer line is blocked off with a balloon where it comes out from under the foundation.  Next the sewer is filled with water.  Given that the sewer is blocked off from the main, if the water level in the sewer drops, there must be a leak. 

Generally, when a leak is detected, the balloon is reset and the lines are retested. Sometimes the test for a sewer leak gives a false reading, which is why the test should be repeated before going on to leak location. Leak tests only tell you if there is a leak, they do not tell you where the leak is located.


Sewer leaks are located with cameras that can be pushed down sewer lines, or by isolating and flooding individual sections of pipe.  Water line leaks are usually located with listening devices of various sorts.


Repairing sewer leaks can cost from as little as $800 to over $20,000.  The cost depends on the condition of the lines and the nature of the problem.  If your home has old iron lines that have largely rusted away, then a major repair may be necessary.  The only way to find out is to have a camera inspection of the lines, which should include the use of a locating device, which helps to map the locations of the sewer lines.

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To repair a leaking water line, it is necessary to break though the foundation, cut out the damaged pipe, and then install new pipe.  Such repairs are much simpler that sewer leak repairs and can often be fixed for less than $1,000.


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Christopher Lorenzo
Christopher Lorenzo
19:36 06 Sep 17
I have had multiple good experiences with Advance Foundation Repair. They stand by their work and kept me informed at all times on the repairs. Post work service was good too. I am very satisfied with their workread more
Ruth Schuman
Ruth Schuman
19:56 05 Sep 17
Workers were very professional and hard working. They dug up around the house and put plants back to look nice. This company also has a trust to forever be able to redo warranted work.read more
Gwen Baumann
Gwen Baumann
02:30 11 Aug 17
I can't too highly recommend this company. I had work done of my foundation by another company several years ago. That work did not resolve the problem, and that company did not fix. Advanced was recommended to me by mother, who said they were the best in the business. I agree! They were polite, professional, charged reasonable prices, and did excellent work. They also have a strong guarantee that is backed by a trust. I can't imagine why you'd use any other company.read more
Linda Krizka
Linda Krizka
19:44 10 Jul 17
Advanced Foundation repair is the only way to go! The engineer, Eric was kind, helpful and informative! The crew under Haynard's watch was unbelievably considerate. The crew was in and out of our house for 5 days. Everyone of them were happy even in the 90 degree weather. They work hard and were very polite. If you saw my house now you would never even know they were here. They cleaned up every night and on the last day it looked like new! Very thankful to have been able to work with them.read more
Michael Francis
Michael Francis
00:48 29 Apr 17
Advanced recently performed our foundation repair and did a fantastic job! The job took four days and throughout the process, the workers were on time each day, were kind and courteous. They left our house clean each day and took great care in making my wife and newborn comfortable during the repair. They came back out to make adjustments, as was expected, and I am more than pleased with the results. Thanks to Juan Martinez, Miguel Mata and Ernesto Alvarato for doing everything I requested. I highly recommend Advanced Foundation Repair, they know what they are doing.read more
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