Information for architects: 
how to specify membrane

The substrate of your building will determine how we go about testing for leaks. Learn more about the process below.


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Membrane on plywood (non‐conductive substrate)

EFVM® requires (VMG™) Vector Mesh Grid between the plywood substrate and the membrane. If there is a breach in the membrane this will create a connection to the VMG™ beneath.  
The VMG™ is a stainless steel grid that is a patented conductive medium when used with roofing/waterproofing systems that incorporate Electric Field Vector Mapping (EFVM®) leak detection systems. 


Membrane on insulation (non‐conductive substrate)  

EFVM® requires (VMG™) Vector Mesh Grid between the insulation and the membrane. If there is breach in the membrane this will create a connection to the VMG™ laid on top of the non‐conductive insulation.

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Membrane on concrete (conductive substrate) - no mesh required

EFVM® electronic leak detection can be performed on the membrane  application after the installation of the membrane. The concrete and reinforcing steel will create an electrical potential difference if there is a breach in the membrane.


FOR MORE INFORMATION

Click here for the ASTM standard guide on flood testing horizontal waterproofing installations.