Masonry Magazine August 2010 Page. 28
MANUFACTURED STONE
Drawing No. ES W244(E)
MVIS
total anticipated load for adhered masonry veneers. It is important to note that the code established deflection standard is utilized in absence of project specific engineered building constructs. Design professionals are empowered to design/engineer the building to adjust deflection criteria if deemed appropriate.
Therefore, in many cases, project specifiers have found that the deflection standard of L/360 under total anticipated load is more practical for finishes such as thin brick, ceramic tile, glass tile and porcelain tile and the deflection standard of L/480 under total anticipated load is more practical for stone and AMSMV finishes. Consult with the AMSMV manufacturer for more information on deflection requirements.
As with traditional adhered masonry veneer, backup wall constructs consist of concrete, concrete masonry units, wood or steel framed assemblies with fastened lath and plaster systems. Cement backer board applications installed over steel framing in accord with Tile Council of North America Method W-244 (E) is also a commonly specified installation system for adhered veneers (see figure 3).
Specifiers can use the CSI Master Format section 04 73 00 Simulated Stone (or 04 70 00 Manufactured Masonry) section to reference and specify AMSMV units and installation methodology. Dimensional stone installation contractors can seek out this work in their bids by referring to this section in building specifications when estimating projects. Inform construction managers and architects that you work with that your firm can perform AMSMV work in addition to typical dimensional stone work. Under certain circumstances, AMSMV work may be bundled with other masonry work specified under section 4.
In addition, ASTM standards are under development for AMSMV units under the oversight of ASTM International Committee C15 on Manufactured Masonry Units, namely subcommittee C15.11-ASTM WK12802-New Specification for AMSMV Units.
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Traditional installation methodology
UNTIL NOW, AMSMV units have been treated like traditional brick or natural quarried stone and installed with the same type of mortars; Type S or Type N masonry mortars.
Depending on the substrate type, two layers of a weather resistive barrier (e.g. 15-pound builders felt) and galvanized wire lath is fastened to the structure/substrate prior to the installation of the AMSMV units. In many cases, the wire lath is floated with Type S or Type N masonry mortar. The float coat is either applied to just encapsulate the wire lath or applied in a traditional two coat process; scratch coat (~1/2 inch, or 12mm, thickness) and a brown coat (~5/8-inch, or 15mm, thickness).
The AMSMV units are then buttered with additional Type S or Type N mortar (~3/8-inch, or 9mm, mortar thickness after beat in) and then pressed into place on the wall assembly. As the units are tapped into place, the mortar squeezes into the mortar joints and grips the edges of the units. Then additional mortar is placed into the joints and pointed to the desired finish.
August 2010 www.masoncontractors.org
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