Water Control Technology (WCT)

Water Control Technology (WCT) is based on preserving the superior performance characteristics of concrete block while adding features that improve the ability of masonry wall assemblies to resist moisture penetration.

CPG made subtle changes to the top surfaces of each WCT block’s webs to discourage water from crossing to the interior face shell. Corners and ends can use the WCT drainage zones without compromising aesthetics or performance. These innovations are accomplished with a block that is fully compliant with the concrete masonry unit standard, ASTM C90.

The new masonry wall system with superior resistance to moisture penetration.

  • WCT concrete masonry units feature integral drainage zones that direct moisture to the wall’s drainage system.
  • No special installation techniques required–cost-effectiveness is assured.
  • All units have integral water repellent in their mix design.
  • Offered in a wide variety of shapes, sizes and colors.
  • Meets ASTM-C90 standards.
WCT Unit Testing

WCT units (see photo) were spray bar tested with no mortar (just gaps) alongside a traditional block design (right) with a water flow rate equivalent to 180” of rain per hour for a half hour and then at a rate of 30” of rain for an additional 24 hours.

Result: The traditional block began to show moisture penetration to the interior surface after 11 seconds. The WCT block completed the 24 hour test without any evident moisture penetration to the interior surface of the wall.

Views below show the interior cores of WCT™ vs. Standard CMUunder extreme (180 inch/hour) spray bar testing:

WCT Draining Zone

The WCT drainage zones divert water from traveling across joint areas and direct any moisture that penetrates the exterior shell downward into the drainage cores of the units so that the water can exit via the flashing and weep systems in the wall.


Water Control Technology Brochure