Stucco Drainage System

Without proper ventilation and drainage moisture can accumulate between the water resistive barrier and siding of a building.

Stucco drainage system.

Get the drainage plane right once you accept that the stucco itself lets water through it s easy to understand why the building envelope must be made watertight before the stucco is applied. Poor sealing sealing stucco around windows and doors is an important step to keeping it strong. Without insulation a rainscreen stucco system was easy to implement. Newer eifs systems include a drainage arrangement to help keep moisture from becoming trapped behind the covering.

Waterway 3 mm is a nominal 1 8 inch 3mm thick drainage product consisting of a polymer core of fused entangled filaments bonded to a moisture resistant filter fabric on the outer surface. Eifs vs stucco with continuous insulation the eifs industry recognizes that continuous rigid insulation is not a perfect barrier system and as a result relies on a drainage gap between the foam and the water resistive barrier to drain liquid. Rainscreen products for stucco installations if you want to install stucco and not rot your walls choose one of these products to create a drainage plane and ventilation space between the water resistive barrier and the stucco by brian pontolilo july 5 2019. Stopowerwall drainscreen is a high performance stucco finish system with excellent air and moisture protection using stoguard and featuring sto drainscreen technology to promote superior drainage and drying of the wall assembly.

A stucco wall weep screed is a component specified by stucco wall system manufacturers to assure that any water that penetrates the wall coating such as at leaks around the mounts for exterior lighting or at windows or doors will be drained safely to the building exterior. Just create a cavity with a drainage mat between the vapor permeable wrb ab air barrier and the stucco system. Ask a trusted homebuilder for details about contemporary eifs. A 1 8 inch air gap creates a capillary break to drain liquid water and limits thermal loss.

Insufficient stucco drainage when properly installing stucco a drainage system is added at the bottom of the walls. Absorptive claddings increase the risk of solar driven moisture which puts wood substrates at high risk of water damage. If this system is botched the water will penetrate the walls rather than draining.