If you’re working on a stucco project and wondering which weep screed to use, the answer depends on the type of stucco system you’re installing. The two most common systems, three-coat stucco and one-coat stucco, require different weep screeds to function correctly. Here’s what you need to know:
The Right Weep Screed for Your Stucco System
Three-Coat Stucco System: For a traditional three-coat stucco system, you need a weep screed with a 7/8-inch ground. This measurement matches the total thickness of the scratch, brown, and finish coats, ensuring proper drainage and a flush fit.
One-Coat Stucco System: For a one-coat stucco system, use a weep screed with a 1 3/8-inch ground. This larger ground accommodates the 1" foam that is typically used in the one-coat systems.
What Does “Ground” Mean?
The “ground” refers to the horizontal width of the weep screed, which determines how much stucco it can hold. Essentially, it’s the depth of the stucco layer that the weep screed is designed to support. The ground measurement is critical to achieving the correct stucco thickness and ensuring that the system functions properly.
Common Weep Screed Sizes and Design
Weep screeds come in standard lengths, typically 10 feet, making them easy to measure and install as needed. The ground measurements mentioned earlier (7/8" or 1 3/8") are the most common for residential stucco applications, but other sizes may be available for specific needs.
Specialty Sizes: For thinner three-coat stucco systems, a ¾-inch ground weep screed can be used to achieve the desired stucco thickness while still allowing proper drainage. Custom weep screeds can also be fabricated to accommodate thicker foam or specific project requirements, ensuring that the system functions correctly and meets design specifications.
Material Choices: The most commonly used weep screed is made from galvanized metal, which is durable and readily available. Other materials, like stainless steel or specialized coatings, can be ordered for specific purposes. An example would be coastal areas or regions with high humidity that may benefit from these alternatives due to their enhanced resistance to corrosion and environmental wear.
Additional Tips for Choosing Weep Screed...
Match the Weep Screed to the System: Always confirm the type of stucco system being used before purchasing your weep screed. Using the wrong ground size can result in reveal issues with windows and doors and uneven stucco thickness throughout the walls.
Building Codes: Check local building codes to ensure the weep screed you select meets the necessary requirements for your area.
Installation Considerations: Install the weep screed at the bottom of the wall, typically above the foundation or slab, to provide a drainage outlet for water that seeps through the stucco. Make sure the weep screed is level and properly secured.
Staying Focused on Functionality
The primary purpose of a weep screed is to facilitate proper drainage and maintain the structural integrity of your stucco system. By choosing the right ground size for your project and installing it correctly, you’ll ensure that your stucco system performs as intended for years to come.
If you’re still unsure which weep screed to use, consult with a professional or your stucco material supplier to confirm the best option for your specific project.
