Prized for its weather resistance , durability , and timeless beauty , stucco has longbow one of the most popular exterior wall finishes . As a building material , stucco is essentially and exterior plastered of Portland cement, sand , and water . Other ingredients may include lime , masonry cement , and various special additives for enhancing properties like crack resistance , workability and strength . With a few exceptions , stucco is applied much as it has been for centuries a wet mix is troweled onto the wall in successive layers , with the final coat proving the finished color andy decorative surface texture desired .
The two traditional stucco systems are the three coat system for standard wood framed wall and the two coat system used for masonry walls , like brick poured concrete , and concrete block. And today , there’s a third process the one and coat system which allows you to finish standard framed walls with a single layer of stucco , saving you money and considerable time and labor over traditional three coat applications. Each of these systems is described in detail not the next page.
The following pages show you an overview of the materials and basic techniques for finished a wall with stucco . While cladding an entire house or addition is a job professionals masons, smaller projects and repair work can be much more doable for the less experienced . Fortunately , all the stucco materials you can be sure of getting the right blend of ingredients for each application . During your planning, consult with the local building department , fire ratings for walls , control joints, and other critical factors.
Stucco is one of the most durable and low maintenance wall finishes available but it requires getting watch stage of the stucco itself. For this reason , Dyers may want to limit their stucco work to small structures or to repair work only.
Three coat stucco is the traditional application for stud framed walls covered with plywood , oriented strand board OSB, rigid foam insulation sheathing . It starts with two layers of grade D building paper for a moisture barrier. the wall is then covered with self furring expanded metal lath fastened to the framing with galvanized nails .
The first layer of stucco , called the scratch coat , is pressed into the lath , then smoothed to a flat layer about 3/8 inch thick . While still wet , the stucco is scratched with a raking tool to create keys or tooth for the next layer to adhere to .
The brown coat is the layer , Its about 3/8 and brings the wall surface to with 1/4 inch of the finished thickness. Imperfections here can easily telegraph through the thin final coat, so the surface must be smooth and flat. To provide tooth for the final layer ,the brown coat is finished with wood float for a slightly roughed texture.