INTRODUCING WATER INTO THE INTERIOR OF A SLAB FOUNDATION USING A SOAKER PIPE
(An experimental method of introducing moisture under a foundation)

The installation of the pipe can be made by drilling a hole in the perimeter beam at a depth below the bottom of the interior slab.

If the supporting soil under the slab is sand, then it may be possible to water jack the soaker pipe into place with one attempt. If the insertion is through a less granular material, it may be necessary to water jack a pipe into place using a solid pipe with the end open. In this case, the pipe would create a void in which, once the initial pipe is removed, the soaker pipe should be readily introduced into its final location without major difficulties. The hole through the perimeter beam should be sealed using a concrete grout.

The system can be immediately charged by introducing water from a hose bib. The hose bib is required to have a backflow preventer during this operation. After initial charging (not more than 30 minutes), the connection to the hose bib can be removed and the gravity system is allowed to work. This will prevent over saturating the soil. The gravity system should eventually equalize the interior moisture content. When the final configuration is complete, as shown on the installation sketch, the plastic bottle should regularly filled on at least once a day. This will introduce water into the system that fills the initial voids.

The water bottle should be filled each day at the same time, adding no more than 10 gallons of water a day to each bottle. This can be accomplished by using a one-liter bottle as a measuring container or with an automatic valve system.  The interior should be monitored to record the results of the sub slab watering process. A crack can be measured and the result recorded each day at the time that the water bottle is recharged.

When the desired results are obtained, the external portion of the soaker pipe can be removed and the pipe plugged.
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