You can protect the edges with metal trim pieces. You typically apply the three coats of stucco to a metal lath or reinforcement secured to a wall over building paper, including felt paper, sheathing paper, or building felt. The finish coat is a decorative coat, and you can color it to give your finish the look you want. The secondary base coat, also known as the brown coat, provides an even surface for the finish coat to adhere to. You don’t need a scratch coat if you apply stucco over a brick or concrete wall. The scratch coat is the first layer and provides a strong base for the system. Stucco is typically applied in three coats: a rough scratch coat, a secondary base coat, and a finish coat. Traditional stucco is a cement-based plaster that contains a mixture of Portland cement, lime, sand, and water. If water gets under the system, it can cause issues like rot and mold. By comparison, the R-value of regular stucco is just 0.20.ĮIFS, while water-resistant, is not waterproof, however. It also boasts an R-value (the ability to resist heat flow) between 4 and 5.6, making it a great choice for homes in cold climates. Synthetic stucco is 80% lighter than traditional stucco and is relatively durable because it contains fiberglass. The insulation board-which lies below the base coat and is typically made of expanded polystyrene-provides added insulation. This layer strengthens the finish’s impact resistance. The base coat (usually cement mixed with acrylic polymer) sits beneath the outer layer and contains a fiberglass mesh embedded in it. The outer layer of an EIFS siding is an acrylic finish coat that furnishes the material’s texture and protects the inner layers. Some people also refer to EIFS as Dryvit, though Dryvit is not an actual product but rather the brand name of a company that manufactures EIFS products. Is EIFS or Stucco Better for Your Home?Įxterior Insulation and Finish System (EIFS) is a type of wall finishing system consisting of several layers, including an optional water-resistant barrier that covers the substrate, a form-insulation board, fiberglass mesh, a water-resistant base coat, and a finish coat.On the other hand, traditional stucco comprises a mix of natural ingredients like Portland cement, sand, and lime applied in two to three layers over a metal lath on a sheathing. The biggest differences between EIFS and traditional stucco are their constituent ingredients and application methods.ĮIFS consists of synthetic materials applied in several coats over rigid foam insulation and a fiberglass mesh. While they may look similar, homeowners should be aware of some key differences between the two. Stucco and Exterior Insulation and Finish System (EIFS) (also called synthetic stucco) are both aesthetically pleasing, long-lasting options for coating the exterior of your home. BUILT Images / Blend Images / Adobe Stock
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