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5. Is stucco waterproof?
Acrylic stucco systems are supposed to be waterproof. Cement stucco systems …….conventional stucco is weather-resistant, not waterproof. What is the difference? A waterproof stucco system such as EIFS or acrylic finished cement stucco is what is called a face seal. That means it must be waterproof to shed water at its face….that is where the rain or runoff water first impacts it. If it is not waterproof at that face then water gets behind the face-seal and is there trapped in the stucco sheet. Conventional cement stucco becomes a face seal stucco if it is painted with a waterproof coating. What is the danger of having water trapped in the stucco sheet? The stucco sheet is just really a fine grained sponge 5/8 to ¾ inch thick. In the case of waterproof stucco finishes or paints the water finds it way inside and fills up the grains of this stucco and it remains saturated for a long, long time. This saturation wears away at the tarpaper and gradually breaks it down…the wood wets ….the moisture rises and rot occurs.
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