NCMA CMU-WR2

Full Name

NCMA CMU-WR2 – Standard Test Method for Spray Bar Test of Concrete Masonry Units

Scope

The NCMA (National Concrete Masonry Association) CMU-WR2 is a standard test method used to evaluate the water repellency of concrete masonry units (CMUs). This laboratory test simulates wind-driven rain and assesses a CMU’s ability to resist water penetration.

Summary of the NCMA CMU-WR2 test:

  • Procedure: a spray bar equipped with multiple nozzles is positioned above the CMU sample. Water is sprayed continuously onto the unit’s face for a specified duration. The interior of the CMU is then visually inspected for signs of moisture penetration.
  • Evaluation: the test determines whether the CMU remains dry or exhibits dampness on the interior surface. Dampness is typically indicated by a darkening of the unit’s color.
  • Benefits: the spray bar test offers a relatively inexpensive and time-efficient method to assess a CMU’s water repellency. It helps ensure the effectiveness of water repellent admixtures and identify potential weaknesses in the unit’s ability to resist moisture migration.

NCMA CMU-WR2 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the NCMA CMU-WR2 standard.

At our laboratory, we are equipped with the expertise and technology to conduct the NCMA CMU-WR2 spray bar test according to industry standards. Our testing services can help you:

  • evaluate the water repellency of CMUs with and without integral water repellents.
  • ensure your CMUs comply with project specifications and building codes.
  • identify CMUs that may require additional waterproofing measures in the construction project.

By incorporating NCMA CMU-WR2 testing into your quality control process, you can select CMUs that provide optimal water resistance for durable and weatherproof construction. Contact us today to learn more about our NCMA CMU-WR2 testing services.

Resources

Keywords

spray bar; concrete masonry unit; CMU; water repellency; penetration; moisture; wind-driven rain; admixture; evaluation

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