When you hit lath, stop—the bit won't go through wood—pull out the bit, and drill another hole about 3 inches from the first and about 2 inches from the crack. Using a 3/16-inch masonry bit, drill a hole in the plaster about 2 inches from the crack. When applying plaster to the damaged area, it’s important to use a thin coat so it dries evenly. When salts from the masonry substrate come in contact with water, they migrate to the surface of the plaster, appearing as dry bubbles or efflorescence. Score the plaster along the chalked lines with a utility knife; then, with a hammer and cold chisel, remove the damaged plaster within the rectangle, chiseling gently to avoid loosening plaster outside the rectangle. Plaster is hardest to clean off dark walls because you will have to wash of any plaster that dropped with rags and water later. Mark its outline on the wall, and, using a screwdriver, punch a hole in each corner of the marked area. Sand the plaster until it is smooth and remove any loose dust. Cracks Unlike drywall, damaged plaster usually has more than just a dent. Bubbling Plaster. Wall covering ideas can conceal damaged walls better than paint. Leaving damaged walls alone and exposed can be such a gruesome sight. 3. You may reach this stage without any noticeable water stains, but when this happens, a portion of the plaster will have to be removed and patched. Lathen plaster was last used in the 30s in the country. Drill Into the Plaster Photo by David Carmack. Condensation on walls. Sand Until Smooth. They are light on your budget, too. 5. 4. Plaster applied to a masonry wall is vulnerable to water damage if the wall is constantly wet. Once the water damage becomes severe, then the plaster will begin bubbling and bulging. It’s okay if it is not yet level with your existing walls as you will build it up to match. Plaster gives a smooth finish to walls and ceilings and is hard-wearing too.Yet, over time, damage can inevitably occur as furniture gets moved around, walls knocked and the like. Major repair requires a professional, but you can perform some lasting quick fixes on your own. When you come across damage to a wall in your home or patches of loose plaster, you’ll need to repair the area before you can start painting or wallpapering – keep reading to learn how! Painting the damage wall is always the first option but sometimes it just is not good enough. Use the steps in my post How To: Patch Plaster to repair the damaged sections. How to Repair Plaster Walls 1. Apply Plaster to The Damaged Area. X Research source Plaster can also damage or scratch wood or laminate floors, so be sure to cover your floors well. If you’re not sure of the cause of a damp patch on a wall, try the foil test. The source of the moisture must be eliminated before replastering the damaged area. 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