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. Step 3 ... a wall will be damaged enough to require a … Painting the damage wall is always the first option but sometimes it just is not good enough. Sand Until Smooth. Unlike drywall, damaged plaster usually has more than just a dent. 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. First things first, make sure you’ve got all the necessary tools to get the job done: check out our comprehensive plastering tools checklist . 3. Sand the plaster until it is smooth and remove any loose dust. Once the water damage becomes severe, then the plaster will begin bubbling and bulging. Drill Into the Plaster Photo by David Carmack. They are light on your budget, too. Leaving damaged walls alone and exposed can be such a gruesome sight. Sagging plaster is somewhat a rare wall damage issue in the UK, these days since lath and plaster surfaces have been long renovated across old British homes and business establishments with the use of plasterboards. 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. 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. Mark its outline on the wall, and, using a screwdriver, punch a hole in each corner of the marked area. Wall covering ideas can conceal damaged walls better than paint. Lathen plaster was last used in the 30s in the country. Using a 3/16-inch masonry bit, drill a hole in the plaster about 2 inches from the crack. 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. 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. It’s okay if it is not yet level with your existing walls as you will build it up to match. Plaster applied to a masonry wall is vulnerable to water damage if the wall is constantly wet. Thankfully there are remedies available to conceal damage walls. Wait for it to dry completely. 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! How to Repair Plaster Walls 1. Bubbling Plaster. When applying plaster to the damaged area, it’s important to use a thin coat so it dries evenly. 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