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Trowel on at least a ⅛” brown coat (both coats should equal a minimum of ½”.įinish the system with a single coat of DRYLOK Extreme Masonry Waterproofer.Īpply a code-approved weather-resistant barrier ( WRB) to the sheathing. Let’s take a look at how each of these is applied:Īpply a ⅜” scratch coat of mortar, roughing up with a scarifier. Sealed cladding systems can be used with CMU construction, as well as OSB and glass-faced gypsum backing. Using the following system fully protects the stucco from water penetration and eliminates the need for a drainage plane because water cannot infiltrate the surface. In order to get optimum results, you need to finish the stucco with a sealant that resists water penetration, but still allows any moisture that gets behind the wall to exit in the form of vapor. Sealed cladding systems have been successfully used for the last 40 years to waterproof stucco and have provided a complication-free service life. Waterproofing a stucco finish requires a multi-step process that provides high resistance to water intrusion while still allowing water vapor to easily escape. However, this isn’t totally true - stucco is indeed permeable and will let some water through. Since stucco is a masonry product, it is often believed to be waterproof already. When properly maintained, stucco has been known to last for more than 50 years. It can be mixed with paint to produce a solid color or it can be painted after it is installed. The proper mixture of Portland cement, lime, sand and water provides a durable, long-lasting exterior finish for your home. So, how can this costly problem be solved? Let’s start with the basics. However, far too often, failures appear in the form of rotten wood on the exterior walls - an issue that could have been prevented if the stucco had been installed correctly. Usually found in the Deep South and other areas of high humidity, stucco must do two things: keep out water and allow the wall to breathe, releasing any water vapor that has been trapped in the exterior wall system. However, stucco is more than just aesthetically pleasing - it’s known to be hardwearing and stable. Stucco creates a beautiful finish that brings a Mediterranean look to any home.