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When it comes to using Hydroxypropyl Methylcellulose (HPMC) for Exterior Thermal Insulation Composite Systems (ETICS) or Exterior Insulation and Finish Systems (EIFS), it is important to follow a step-by-step guide to ensure successful application. Here is a simple guide to help you navigate through the process:
1. Surface Preparation:
- Clean the surface thoroughly to remove any dirt, dust, or debris.
- Repair any cracks or imperfections in the substrate.
- Ensure the surface is dry and free from any contaminants.
2. Mixing:
- Measure the correct amount of HPMC powder using a scale.
- Add the powder to clean water in a mixing container.
- Stir the mixture thoroughly to ensure the powder is fully dissolved.
- Let the mixture sit for a few minutes to allow it to hydrate.
3. Application:
- Use a trowel to apply the HPMC mixture onto the substrate.
- Spread the mixture evenly over the surface, ensuring a consistent thickness.
- Use a comb trowel to create a textured surface for better adhesion of the insulation boards.
- Allow the HPMC to dry according to the manufacturer's guidelines before proceeding to the next step.
4. Insulation Board Installation:
- Apply a thin layer of HPMC onto the back of the insulation boards.
- Press the boards firmly onto the substrate, ensuring they are properly aligned.
- Use mechanical fasteners to secure the boards in place.
- Fill any gaps between the boards with HPMC to ensure a seamless finish.
5. Reinforcement:
- Apply a layer of HPMC over the insulation boards.
- Embed the reinforcement mesh into the wet HPMC, ensuring full coverage.
- Smooth out any wrinkles or air bubbles in the mesh.
- Apply a second layer of HPMC over the mesh to fully encapsulate it.
6. Finishing:
- Once the HPMC has dried, apply a finishing coat of HPMC to complete the system.
- Use a trowel to create the desired texture or finish.
- Allow the finish coat to dry completely before painting or applying any decorative finishes.
By following these steps carefully and precisely, you can achieve a high-quality and durable ETICS/EIFS system using HPMC. Remember to always refer to the manufacturer's instructions and guidelines for the specific product you are using to ensure the best results.
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