How to Repair Lath and Plaster Walls

Lath and plaster walls have been a staple in many homes for decades, but they require regular maintenance to ensure their integrity and appearance remain intact. When holes or cracks appear, it's essential to address them promptly to prevent further damage. In this article, we'll explore the steps involved in repairing lath and plaster walls, providing you with a comprehensive guide on how to achieve professional-looking results.

Step 1: Prepare the Area

Before commencing repairs, it's crucial to remove any loose or damaged plaster from the affected area. This will provide a clean surface for the new plaster to adhere to. Use a flat trowel to scrape away any debris, and vacuum up the dust and debris.

Step 2: Apply Bonding Agent

Essentially a water-based glue, the bonding agent ensures good adhesion between the old work and the new. Brush the bonding agent over the cleaned area and surrounding old plaster, making sure to cover all surfaces evenly.

Step 3: Fill the Holes

Once the base coat is dry, use a flat trowel to fill the holes with more base coat. Add nylon fibers while mixing the base coat for added strength. Mix the material to a stiff consistency to prevent sagging before it sets.

Step 4: Key the Plaster

The plaster that goes between the lath is called 'keys,' and it locks the material in place. Use a flat trowel to coat the exposed lath with plaster base coat, working the material into the spaces between the lath.

Step 5: Apply Finish Coats

Once the patch is ready, apply finish coats of joint compound to smooth out the area. Scrape off any excess with a damp sponge and repeat the process until you achieve a smooth finish.

Tips and Tricks

When repairing lath and plaster walls, it's essential to use good techniques and the right materials. Avoid using so-called patching plaster sold at home centers, as it can be too hard and prone to cracking or delaminating. Instead, opt for a softer, slower-setting lime-based plaster that requires minimal sanding.

Repairing lath and plaster walls may seem like a daunting task, but with the right techniques and materials, you can achieve professional-looking results. By following these steps and using good practices, you'll be able to restore your walls to their former glory. Remember to always use a bonding agent, fill holes with base coat, key the plaster, and apply finish coats for a smooth finish.

Lath and plaster walls repair