To obtain stucco that performs its intended function, go beyond the industry standard by implementing high-performance solutions. 1) Follow the lead of other industries by working to standardize quality control test procedures for the various stucco components. 2) When designing the WRB, remember that it is essentially a waterproofing membrane. Pay close attention to sealing and flashing around penetrations, terminations, odd geometries, and transitions to other systems. Provide continuous solid sheathing to support the WRB, and include provisions that drain water out of the system. 3) Stucco cracks when tensile stresses overcome tensile strength. Reduce stresses in the stucco by preventing load transfer from the structure and maintaining hydration during cure. Increase the stucco's tensile strength with high-performance additives such as lime substitutes, polymer treatments, and fibers. 4) Avoid using premixed stucco products unless you know what's in them, how they've performed in the past, and who to contact at the manufacturer's office in case you have questions or problems. Even then, implement testing procedures to ensure that the selected product is appropriate for the particular project. 5) Gather information about the mix that the installer intends to pump at each project. Work in the industry to standardize pumpable mix designs, and test the mix onsite to check physical properties. The costs of implementing our suggestions will seem small when compared to the value gained and liabilities avoided by improving your project's stucco system.
High-Performance Cement Plaster (Stucco) Systems
September 29, 2008
Publication: AEI 2008: Building Integration Solutions (Proceedings of the 2008 Architectural Engineering National Conference, September 24-27, 2008, Denver, Colorado)
Services: Materials Design