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How many layers of water resistant barrier (WRB) are required for manufactured stone veneer installations?

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In most situations, two layers of WRB complying with ASTM D226, E2556, or approved equal are required for MSV installation.  However, there are some instances where this requirement can differ:

-        - Building codes may allow a single layer of a WRB to be used when a drainage space (rainscreen) is incorporated behind the stone assembly.  Requirements for the rainscreens vary by region.  Verify with the local jurisdictional requirements regarding the use an application of rainscreens. 

-       -  In the event a cladding transition occurs, the number of layers of WRB necessary behind the non-manufactured stone veneer cladding is dependent upon the material selected (i.e. zero layers, 1 layer, 2 layers, etc.).  However, once the transition occurs to AMSV then two (2) layers of WRB must be present.

     - In the presence of concrete/masonry backup assemblies, WRBS are not required.

For details and more information on WRB, please refer to the MVMA MSV Installation Guide (click here).

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It's always a Best Practice to use 2 layers of WRB, Grade D asphalt saturated kraft paper being the one directly behind the metal scratch coat base.

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