Traditional stucco is applied by attaching a wire mesh to the external walls. A base coat or scratch coast of plaster is applied and successive coats are added until the desired thickness is reached. The final or finish coat may have primer added to prepare for paint.
Traditional stucco is praised for its overall strength, resistance to the elements, and the fact that it is less likely to absorb water, which can cause permanent damage to buildings. Additionally, traditional stucco is usually a bit less expensive than EIFS. While this finish is generally stronger than EIFS, traditional stucco can be more prone to small cracks due to the comparative rigidity of the material and is less flexible for design.
Synthetic (EIFS) Stucco
EIFS was designed to be the perfect barrier system. Water could not penetrate in or out. Unfortunately, imperfections due to improper installation, external damage to structure, etc. allows water to get in. Once in, the water cannot get out resulting in mold and/or wood rot in the external structure of the home.
Due to the multi-layered composition of EIFS stucco and the inclusion of insulation in the design, this method offers a more energy efficient option, keeping cool air in during the summer and heated air in during the winter. Additionally, the material is more flexible enabling homeowners to include additional design elements in the exterior like keystones, cornerstones, or other decorative accents. While there are many positive traits of EIFS, one of the largest concerns with this method is its proclivity for absorbing moisture. The layers in EIFS do not breathe, allowing moisture to become trapped and cause severe damage, including wood rot and mold growth.
The primary difference between EIFS and stucco is that EIFS attached a foam board to the outside sheathing and a fiberglass mess is installed before applying the plaster. Traditional stucco applications do not use a foam board.
You can tell if a house uses EIFS by lightly pressing against the exterior wall with your thumb at several places. If the wall has a sponginess and give to it, then it is probably using EIFS
Aliases: Acrylic stucco can also be referred to as synthetic stucco, elastomeric stucco finish and a number of different terms, when you include manufacturer’s special names for their particular synthetic stucco products but are all basically the same.
Made Out Of: The acrylics are made from… you guessed it acrylic resins and/or polymers that are basically like a thin Elmers glue. It resembles paint, in a way, but a very high quality one, that has sand in it, to give the finish a little more definition
Comes In: Acrylics come in 5 gallon buckets and are typically around 50-70 pounds. Unlike traditional stucco, these are wet mixes that are white when they are unmixed, but can be pre-mixed by a manufacturer, if requested.
Cost: The cost for synthetic stucco is higher than traditional stucco and averages out around $40-$50 per 5 gallon bucket. A bucket will cover about 100-250 sq. feet, depending on what texture you choose to go with. This averages out to be about $.25-$.50 a square foot, (rough estimate)
Textures: You can achieve many different textures with acrylic products, not as many as traditional stucco, but still a wide variety to choose from. Some manufacturer’s have specialty textures that they make available that uses different sized aggregates (sand) to achieve custom finishes. This will vary from each manufacturer though
Colors: The colors is one of acrylics strong points because it is very rich and vibrant and is very consistant, meaning that there is virtually no color variation from one bucket to another. There are so many colors to choose from and will differ from manufacturer to manufacturer. Colors are liquid and usually come in a small bottle or container.
How To Apply: The application process first starts with a primer coat, a paint is applied to the walls to seal the wall first and helps prolong the working time of the material at the same time. Next, the material is either troweled on or sprayed on and then troweled down in an even and uniform manner. Additional techniques are used to achieve certain textures and finishes
- This type of material is resistant to hairline cracks, mainly because of its elasticity and ability to stretch.
- Colors are bright and vibrant and there is virtually no color variation from bucket to bucket.
- Can be mixed using a drill with a paddle mixing attachment and does not require a mixer.
- Finish can be painted in the future if you ever wanted to change the color.
- The cost for acrylics is much higher when compared to a cement based finish, due to the polymers used in the material.
- Requires a little more skill to apply because it dries quite a bit faster than the traditional finish does.
- May have limited stock, depending on where you live, not all suppliers will stock it and it may be a special order material.
Aliases: Other names include: classic stucco, hard coat stucco, cement stucco finish, hard coat finish and a few other ones. Like the synthetic stucco, manufacturer’s have special products that will have more names as well, but are the same thing.
Made Out Of: Traditional stucco is made from Portland Cement and Lime and looks and feels like it. It’s main ingredients are cement, sand (white usually), lime and water. So the two only share sand as a common material used for both
Comes In: You can find cement based stucco in bags, just like you would concrete at the Home Depot, for instance. They are usually around 80-90 lb. bags and come in a dry, powder-like form, when they are unmixed
Cost: Traditional stucco is cheaper than acrylics and costs around $10-$15 for a 80-90 lb. bag. A 90 lb. bag can cover approximately 100-180 square feet, depending on the base coat, type of finish and application techniques. This breaks down to about $.05-$.10 a square foot (rough estimate)
Textures: There is really no limit to the number of textures that you can achieve with traditional stucco. Textures range from smooth finishes to rough ones and everything in between. Different sized sand is used to achieve a wide range of textures ranging from smoother ones to very rough textures.
Colors: Since this is a cement based product, the color tends to not be as bright as acrylics, nor as consistent. Each batch of stucco that is mixed will differ slightly and it is much harder to keep a consistent color with this product. Lighter colors are recommended for this application. The color is a powder and comes in a small bag or carton.
How To Apply: The walls are given a thorough soaking with water, in order to increase the working time and to ensure that the finish adheres to the substrate adequately. Just like the acrylics, it is applied using a hawk and trowel or can be sprayed on and is then troweled down tighter, for a uniform coat. Additional techniques are used to achieve specific textures after that.
- The price of the material itself is quite a bit lower than synthetics are and can really save you money for larger projects.
- This material is very versatile and there really is no limit to the number of textures that can be achieved.
- The material can be found nearly everywhere, even at larger chain retailers like Lowes.
- The finish can be painted later on or 30 days after application
- Usually when you mix this material, you will want to mix enough bags for an entire wall, so there is minimal color variation, which requires a mixer.
- The color can change due to too much water, not enough, different application methods, etc.
- It requires additional mud stands and boards to hold the material, which isn’t required for acrylics.