How to Parge over Cement Board

Parging is a process of applying a thin layer of mortar or cement-based material to a wall or other surface. It is often used to cover up imperfections in the surface, such as cracks, and can also be used to give the surface a more uniform appearance. Parging over cement board is a common way to finish off walls and other surfaces in construction projects.

Step 1: Prepare the Surface

Before you begin parging, it is important to make sure that the surface is clean and free of any dirt or debris. Use a wire brush or vacuum cleaner to remove any loose particles from the surface. If there are any cracks or holes in the cement board, fill them with a patching compound before proceeding.

Step 2: Mix the Mortar

Once the surface is prepared, mix together your mortar according to the instructions on the package. Make sure that you use enough water so that the mixture has a thick but spreadable consistency. You may need to adjust the amount of water depending on how thick you want your parge coat to be.

Step 3: Apply the Mortar

Using a trowel, apply an even layer of mortar over the entire surface of the cement board. Make sure that you spread it out evenly and that there are no gaps or air pockets. Allow the mortar to dry for at least 24 hours before proceeding.

Step 4: Smooth Out Any Imperfections

Once the mortar has dried, use a damp sponge or cloth to smooth out any bumps or ridges in the parge coat. This will help ensure that your finished product looks even and professional.

Step 5: Seal and Protect

Finally, seal and protect your parged surface with a clear sealant. This will help keep moisture out and prevent damage from weathering or wear and tear.

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