Case Studies

Heave Remediation Case Studies: Moisture Level System reduces vapor transmission through floor slab in Phoenix, AZ

Thursday, August 10th, 2017 by Kristina McGovern


The Donor Network of Arizona Building in Phoenix, AZ was experiencing the transmission of moisture vapor through several areas of the interior floor slab. Arizona Foundation Solutions (AFS) was hired to design and install a floor venting system to reduce moisture vapor transmission through the concrete. Before work could be started on the ventilation system, the building had to be inspected for water leaks and drainage issues around the perimeter of the building.


AFS installed our Moisture Level System under the floor in the area of the cooler room in the east center portion of the Donor building and in the northwest corner portion of the Donor building.

The system reduced the transmission and condensation of moisture through the slab in the area of the pipes by drawing moist air from the aggregate base layer and replacing the moist air from under the slab with outside air that is typically less humid.

Intake pipes were placed just inside perimeter exterior walls and the suction pipes at the farthest distance from the perimeter walls. Suction fans were installed to pull relatively dry outside air into the intake pipes and draw out moist air from under the floor slab in the suction pipes. 

In addition to handling design and installation of suction fan electric wiring, suction pumps mounting and above slab piping, AFS also took care of gaining all necessary permits for the work.

It was estimated that the Moisture Level System would remove about 12.2 pounds of water per day from under the slab.

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