Manufacturers complying with MVMA standards generally ensure their products meet or exceed: Often above 1800 psi. Water Absorption: Must be managed to prevent damage.
The Masonry Veneer Manufacturers Association (MVMA), often in collaboration with the National Concrete Masonry Association (NCMA) , provides industry-standard guidelines to ensure the quality, safety, and durability of adhered manufactured stone veneer (AMSV). Their primary guiding document is the "Installation Guide and Detailing Options for Compliance with ASTM C1780." Key MVMA Installation Guidelines (ASTM C1780) masonry veneer manufacturers association
The MVMA guidelines are designed to prevent moisture intrusion and ensure long-term structural integrity. Their primary guiding document is the "Installation Guide
The guidelines offer detailed instructions for installing over cement board and other modern substrates. Manufacturer Responsibilities The MVMA recommends Type N or Type S
Disclaimer: Always prioritize the specific product manufacturer's installation instructions, which may have additional requirements beyond the general MVMA guidelines.
The MVMA recommends Type N or Type S mortar, often specified to have low water absorption and high compressive strength, ensuring compliance with ASTM C1780 .
A weep screed with a minimum vertical attachment flange of 3.5 inches is required at the base of the wall to drain moisture. This should be placed at least 4 inches above earth or 2 inches above paved surfaces. Lath Requirements: Self-furred metal lath (minimum 2.5 lb/ yd2y d squared