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- Approved Applicators
March 24, 2015
To reduce the risk of corrosion of metal lath and corner reinforcement in Stucco Wall Systems, careful selection of materials, proper application of details and cement stucco coats, proper embedment and proper building design must be maintained. Corrosion cannot occur without the presence of water, therefore, proper details of avoiding horizontal surfaces, and timely repair of cracks must be maintained. Acrylic finishes, while designed to avoid water intrusion, act to contain moisture ingress and keep the wall from drying, sometimes enhancing corrosion.
CTS Cement Manufacturing Corporation recommends the use of plastic or stainless steel corner aid when acrylic finish is used over Rapid Set® Eisenwall® cement and Stucco Mix basecoats, or in high moisture/humidity environments. This practice is also specified by the following associations and manufacturers:
Performance and corrosion resistance of wire lath and corner aids depends on the quality of the steel and the quality and thickness of the galvanizing or zinc coating, as well as proper embedment of the metal lath and accessories. If using metal corner aid (and when selecting all metal lath), be sure to select high quality products from a reputable manufacturer. CTS has conducted corrosion testing on metal lath and corner products available in the market and found they are not all of equal quality; corrosion performance can vary widely.