Installing exterior stucco walls involves preparing the surface and applying multiple layers of the stucco mixture. The process, suitable for wood exteriors, typically follows several key steps to ensure durability and a proper finish.
Step-by-Step Guide to Stucco Installation
Applying stucco is a multi-stage process that builds up the wall finish layer by layer. Here is a breakdown of the fundamental steps involved:
Step 1: Apply the Stucco Netting
Before applying any stucco, the wall surface needs preparation. According to the reference, the first step is to cover the wood exterior with a plastic or metal stucco netting, also known as lath.
- Purpose: This netting provides a surface for the stucco to key into, ensuring it adheres properly to the wall and prevents cracking due to movement.
- Material: Can be made of either plastic or metal.
Step 2: Apply the Scratch Coat
Once the netting is securely in place, the first layer of stucco mix is applied. This is called the scratch coat.
- Purpose: The scratch coat is the initial layer of stucco that goes directly over the netting. It is applied with sufficient thickness to embed the netting fully.
- Key Feature: While still wet, this layer is typically scratched horizontally using a rake-like tool. These scratches create grooves that help the next layer adhere firmly.
Step 3: Apply the First Layer of Stucco
Following the scratch coat, the next significant layer is applied. The reference refers to this as the first layer, often called the brown coat or leveling coat in stucco applications.
- Purpose: This layer is applied over the hardened scratch coat. Its main functions are to build thickness, provide a level surface, and prepare the wall for the final finish coat.
- Process: It is typically applied to a consistent thickness and then smoothed using a darby or trowel. It is allowed to cure partly before the final coat is applied.
Step 4: Apply the Final Coat
The last step in the process is applying the final coat, also known as the finish coat.
- Purpose: This is the visible layer of stucco that provides the desired color and texture to the wall.
- Customization: The final coat mix can be colored, and various techniques can be used during application to create different textures, from smooth to rough or patterned finishes.
By following these steps—applying the lath, followed by the scratch coat, the first layer (brown coat), and finally the finish coat—a durable and attractive stucco exterior can be achieved.
