Microcement is an increasingly popular solution for a wide range of interior and exterior applications, from sleek countertops and modern flooring to eye-catching bathroom walls. Its seamless and versatile finish is highly sought after for both residential and commercial projects. However, the success of a microcement installation depends not only on the topcoat but also on what goes underneath it.
For manufacturers, contractors, and industry professionals, understanding the underlayment—or the materials used beneath the microcement layer—is crucial to ensure durability, performance, and longevity. This blog will explore what goes under microcement, the different substrates that are suitable, and the essential steps to take before applying microcement to guarantee optimal results.
1. Understanding Microcement and Its Application
Before delving into what goes under microcement, it’s essential to understand its unique properties and installation requirements. Microcement is a thin-layer coating made from a mixture of cement, resins, additives, and pigments. Its primary advantage lies in its ability to be applied seamlessly over almost any surface without the need for demolition or removal of existing materials.
However, to ensure the final result is both durable and aesthetically pleasing, the underlayment must be compatible with the microcement and prepared properly.
2. Substrates That Go Under Microcement
The substrate, or surface material beneath the microcement, plays a critical role in the adhesion, stability, and performance of the microcement finish. Below are the most commonly used substrates for microcement applications:
1. Concrete Substrates
Concrete is one of the most common substrates for microcement, particularly for floors, countertops, and exterior surfaces. Concrete provides a solid, stable base that offers excellent adhesion for microcement.
- Preparation: Before applying microcement over concrete, it is important to clean the surface thoroughly to remove dirt, dust, and any loose particles. For added adhesion, some professionals may apply a primer or bonding agent to ensure a strong bond between the concrete and microcement.
- Considerations: Concrete may require some form of moisture barrier if the substrate is not properly sealed, especially in areas prone to moisture like bathrooms or basements.
2. Wood Substrates
Microcement can be applied over wood surfaces such as plywood or MDF (medium-density fiberboard), making it suitable for furniture, shelves, and wall applications. However, the wood must be prepared properly to ensure the longevity and stability of the microcement finish.
- Preparation: Wood surfaces require a primer or bonding agent before applying microcement. This helps create a stronger bond between the wood and microcement while preventing potential expansion or contraction due to changes in temperature or humidity.
- Considerations: Wood substrates can be sensitive to moisture, so it’s essential to ensure that the surface is dry and free from any moisture before applying the microcement.
3. Tiles (Existing Surface)
One of the major benefits of microcement is its ability to be applied directly over existing tile surfaces, making it an ideal choice for renovations. Tiles, including ceramic, porcelain, and stone, provide a solid and stable surface for microcement to adhere to.
- Preparation: Tiles need to be cleaned thoroughly, and any grout lines should be smoothed out to ensure an even application of the microcement. A bonding agent may also be applied to improve adhesion.
- Considerations: If the existing tile surface is glossy, it might require light sanding to create a rougher texture for better adhesion.
4. Plaster or Gypsum Board (Drywall)
Microcement can also be applied over plaster or drywall, which is commonly found in residential and commercial interiors, particularly for wall applications. When used correctly, microcement can provide a high-end, seamless finish that enhances the aesthetic value of a space.
- Preparation: The plaster or drywall surface must be smooth and dry before applying microcement. Any imperfections, such as cracks or holes, should be filled in and sanded down.
- Considerations: For better adhesion, applying a primer is recommended. Additionally, drywall may not be as durable as concrete or tile, so extra care is needed in areas with high traffic or moisture exposure.
5. Fiber Cement Boards
Fiber cement boards, often used in wet areas like bathrooms and kitchens, provide an excellent base for microcement. These boards are resistant to moisture, making them ideal for applications such as shower walls and backsplashes.
- Preparation: Fiber cement boards require thorough cleaning and the application of a bonding agent to ensure proper adhesion of the microcement.
- Considerations: These boards are ideal for use in high-moisture areas due to their ability to resist water damage.
6. Marble or Stone Surfaces
Applying microcement over stone or marble surfaces is a more advanced application. Although the base is sturdy, the smooth, non-porous nature of marble or stone can pose a challenge for adhesion.
- Preparation: To improve the bond, the stone or marble surface must be roughened slightly. A bonding primershould be applied to promote adhesion.
- Considerations: The smoothness and hardness of stone make it more difficult for the microcement to stick, so it’s crucial to take extra care during the preparation phase.
7. Metal Surfaces
Microcement can also be applied over metal, though this is less common. It’s typically used for furniture, decorative surfaces, or industrial applications where an exposed concrete look is desired.
- Preparation: Metal surfaces must be cleaned, degreased, and etched to ensure good adhesion. A bonding primeris necessary to promote a strong bond between the metal and the microcement.
- Considerations: Metal can be prone to rust or corrosion, so proper sealing is essential to avoid moisture-related issues.
3. Why Substrate Preparation Matters
The key to a successful microcement application is proper substrate preparation. Each surface has different needs, but proper preparation ensures that the microcement adheres securely, providing a long-lasting and durable finish. Failing to properly prepare the substrate can result in peeling, cracking, or inconsistent results.
Steps for proper preparation include:
- Cleaning: Surfaces should be free of dust, dirt, oils, and other contaminants.
- Priming: Depending on the substrate, a primer or bonding agent is often necessary to improve adhesion.
- Leveling: Any cracks, holes, or imperfections should be patched and smoothed out to ensure an even surface.
- Drying: Ensure that the surface is completely dry before applying microcement to avoid issues related to moisture.
- Sanding: For smooth or glossy surfaces, light sanding may be necessary to create texture for better adhesion.
4. Conclusion: What Goes Under Microcement?
The substrate beneath microcement plays a pivotal role in the success of the application. Whether applying microcement to concrete, wood, tiles, plaster, or more specialized surfaces like fiber cement or metal, proper preparation is key to achieving a durable, long-lasting finish.
As a manufacturer or industry professional, understanding which materials are compatible with microcement—and how to prepare them properly—ensures that your installations will stand the test of time. A well-prepared substrate will allow the microcement to adhere properly, enhancing both its aesthetic appeal and functional durability.