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Stucco Qualities
Durable Fire Resistant, Rated and Tested After standardized testing, stucco was found to be classified as non-combustible material, and stucco clad assemblies can achieve a fire-rating of 1-4 hours. The surface burning characteristics have a flame spread of zero and smoke development of zero. Stucco applied over brick or concrete contributes to the fire resistance of the wall assembly. Weather Resistance A stucco assembly (water resistant barrier, lathe and cement plaster) is classified as a concealed weather barrier system, which accommodates moisture intrusion that may occur at wall penetrations (windows, vents, etc). The water resistant barrier between the cement plaster and the substrate directs the moisture to drain down and out at a “weepage” point. An important physical property of a stucco assembly is the breathability, allowing moisture vapor between the water resistant barrier and cement plaster to escape through to the outside. In the design and application of a stucco system, it is important to focus on keeping water out. There is always the possibility that moisture may enter, therefore, it is reassuring to know that a stucco assembly allows moisture to drain out. Peak Stucco & Stone follows the recommendations found at: NorthwestWallandCeiling.org Guidelines |