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WHAT IS A CONVENTIONAL STUCCO SYSTEM?
Conventional – or three-coat – stucco will have a mechanically fastened weather barrier, or sprayed or rolled-on air and moisture barriers. Over the weather barrier will be expanded or woven wire lath, and then a portland cement scratch and brown coat. The finish can be a variety of products used individually – or in combination – to provide color and texture to the surface.
WHAT IS A ONE-COAT SYSTEM?
One-coat stucco is a proprietary blend of cements and fibers. It is typically applied over a rigid foam board and lath to provide an Energy Code required Continuous Insulated durable cladding. One-coat stucco is Building Code compliant, tested and proven since the 1970s.
IS A ONE-COAT SYSTEM REALLY ONE COAT?
No, one-coat refers to the fact that the conventional basecoat that is applied in two coats (scratch & brown) to a nominal 3/4 inch thickness, can be applied in one coat to a nominal 1/2 inch thickness over foam or other rigid sheathings. All other items, building paper, trims and the finish coat are the essentially the same as a conventional stucco.
DO THE BUILDING CODES APPLY TO THESE SYSTEMS?
First there are broad national specifications to consider. EIFS and conventional stucco applications are part of the International Building Code (IBC). One-coat stucco systems have a third-party report from a model code agency as an application guideline. Manufacturers’ reports can be found on their websites or on the ICC website at www.icc-es.org.