Patching lath and plaster walls Feb 2024

Patching lath and plaster walls and ceilings after water damage can be a daunting task, but with the right tools and techniques, it can be done effectively and efficiently. Water damage to lath and plaster can cause the plaster to loosen and crumble, creating unsightly cracks and holes. Not addressing these issues can lead to further damage and potentially compromise the structural integrity of your walls and ceilings.
The first step in patching lath and plaster is to assess the extent of the damage. This includes determining the source of the water damage and addressing any underlying issues, such as a leaky roof or plumbing problem. Once the source of the water has been fixed, it is important to allow the affected area to dry completely before beginning any repairs. This may require the use of dehumidifiers or fans to expedite the drying process.
Next, it is important to remove any loose or damaged plaster from the affected area. This can be done using a putty knife or scraper. It is important to be gentle during this process to avoid causing further damage to the lath behind the plaster. Once all loose plaster has been removed, the edges of the remaining plaster should be scraped and sanded to create a smooth surface for patching.
The next step is to create a plaster mix to fill in the holes and cracks. This can be done using a pre-mixed joint compound or by mixing traditional plaster with water. It is important to follow the manufacturer's instructions and create a smooth, workable consistency. Using a putty knife, carefully apply the plaster mix to the damaged areas, making sure to completely fill in any holes and smooth out any cracks. It may be necessary to apply multiple layers of plaster, allowing each layer to dry completely before applying the next.
After the plaster has dried, it is important to sand the patched areas to create a smooth, even surface. This will also help to blend the patched areas with the surrounding plaster. It may be necessary to prime the patched areas before painting to ensure an even finish.
In some cases, the lath behind the plaster may also be damaged and in need of repair. This can be done by replacing individual laths or using a patching compound specifically designed for lath and plaster. It is important to follow the manufacturer's instructions and allow the patching compound to dry completely before continuing with the plaster repairs.
Patching lath and plaster walls and ceilings after water damage can be a time-consuming and labor-intensive process, but it is essential for maintaining the integrity and appearance of your home. It is important to take the time to properly address any water damage and make necessary repairs to prevent further issues in the future. If the damage is extensive or you are unsure of how to proceed, it may be best to seek professional help to ensure the job is done correctly and to avoid any potential safety hazards. With proper repairs and maintenance, your lath and plaster walls and ceilings can be restored to their former beauty and strength.

Contact form

Please fill in this short form for an immediate reply. An email will be sent to the owner.


Text or Call