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Stucco is installed over rigid insulation, which is installed over a drainage plane consisting of a drainage gap and building wrap layer over the sheathing

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The sheathing has rotted because there was not a sufficient drainage gap behind the stucco cladding

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Improving Drainage and Drying Features in Certain Conditions: Rain Screen Design for Absorptive Cladding

Reference

Guide detailing best practices on how to build wall assemblies with absorptive claddings such as brick, stone that drain and dry well.

Standard Specification for Manufactured Polymeric Drainage and Ventilation Materials Used to Provide a Rainscreen Function, ASTM E2925–19a

Reference

Specification describing criteria for manufactured polymeric materials used to provide a rainscreen function, a means for the drainage of liquid moisture and the ventilation of vapor moisture that enters an above-grade exterior wall assembly which was published in the year 2019, and is available for...

A plastic fiber drainage mat rainscreen provides uniform support for the siding and allows moisture to flow horizontally and diagonally in addition to vertically.

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Temporary dry floodproofing wall design concepts

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Rainscreens: A Builder’s Experience

Presentation

Webinar from Peter Barrett of Dorken Systems Inc. and Chris Donatelli of Donatelli Builders discussing how rainscreens work to add drainage and drying capacity to residential walls, using a real-life example from a retrofit home in Chicago. Free EEBA login required.

Nashville's Home Inspector reveals clogged "Weep Holes"

Video

Video showing how the weep holes in a brick façade are sometimes filled by the homeowner or subsequent contractor who mistakenly thought the holes are the result of an installation error during the brick laying work. These holes are important to the drainage and ventilation of the wall, please don’t...

Stucco is installed over rigid insulation, which is installed over a drainage plane consisting of a drainage gap and building wrap layer over the sheathing

The sheathing has rotted because there was not a sufficient drainage gap behind the stucco cladding

Improving Drainage and Drying Features in Certain Conditions: Rain Screen Design for Absorptive Cladding

Standard Specification for Manufactured Polymeric Drainage and Ventilation Materials Used to Provide a Rainscreen Function, ASTM E2925–19a

A plastic fiber drainage mat rainscreen provides uniform support for the siding and allows moisture to flow horizontally and diagonally in addition to vertically.

Temporary dry floodproofing wall design concepts

Rainscreens: A Builder’s Experience

Nashville's Home Inspector reveals clogged "Weep Holes"

Air Sealed, Insulated Basements

Pre-Retrofit Assessment of Walls, Windows, and Doors

Vinyl Siding with Integrated Rigid Foam for Existing Walls

Condensation Control for Walls in Cold Weather