Keep the room at this temperature at least 24 hours before plastering to ensure the walls are completely dry. The best temperature for plastering is between 55 degrees and 70 degrees. Helpful TipsĮxcess moisture in the wall or room can affect the plastering, so make sure to fix any leaks or causes of moisture several weeks before plastering. Wear a sanding respirator to prevent inhalation while breaking dried plaster or when mixing. When plastering, wear safety goggles, a long sleeve shirt and cotton work gloves for eye and skin protection. Crack repairs usually need only one layer of plaster. Apply a layer of plaster to the crack with a 4” wallboard knife, making sure the layer is even with the rest of the wall. Pour the plaster from the bucket into a mud pan. Follow the manufacturer’s instructions to mix dry plaster with water in a large bucket. Dampen the area with a spray bottle and water. Use a cloth or rag to wipe away dust and debris. Smooth and remove loose plaster pieces and any jagged edges on the surface around the crack with a putty knife. Helpful TipĪ shop vacuum is a great tool for cleaning up sanding dust. Close off the room using plastic sheeting and painter’s tape and cover vents to keep sanding dust from travelling through your HVAC system. This will protect the floor from any spilled or splattered plaster or joint compound and make clean up a bit easier, as much of the dust from sanding will collect on the drop cloths. How to Fix Cracks in Plaster Step 1: Prepare the Roomīefore starting, cover the floor with plastic drop cloths and fasten the cloths in place using painter’s tape. It can, however, require a bit more extra time and skill than patching a hole in drywall. If you have holes or cracks in your plaster walls or ceilings, repairing them isn’t difficult. Hold it for a while to allow the adhesive or filler to stick.Many older homes may still have some walls and ceilings made of plaster and lath instead of the now standard drywall or wallboard. Slide the wood through the hole and guide it into position until you can use the string to pull it against the back of the hole. The idea is to slide this backing piece into the hole, then pull it tightly against the back of the surrounding plasterboard using the string as a handle.īefore doing that, spread filler or coving adhesive over the 25mm sections at each end of the wood. Tie a nail to the string at the back of the wood so that the string will not pull out. 25mm extra at each end should be fine.ĭrill a small hole in the middle of the wood and thread a bit of string through it. This needs to be the same width as your hole so that it will slip inside, but longer at each end so that it won’t pull back out. Find an offcut of plywood or hardboard and cut a backing piece out of it. Rather than a jagged hole, you now have a nice neat rectangular hole. Drill holes inside each corner of the square and use a Padsaw to cut out the square. The first thing you need to do here is to draw a rectangle around the hole so that the broken section is just inside the lines. Holes between 15mm and 120mm wide will need to be fitted with a backing piece of wood to stop the filler just falling through the hole. When this is completely dry, sand it back flush with fine sandpaper on a block. Now go back and fill the remainder of the hole, leaving the filler slightly proud of the surrounding wall. When you have built up the edges of the hole as much as possible, but have not actually filled it, let the filler set for a while. Use the corner of a small Putty Knife or an old wide-bladed screwdriver. Mix up your filler as per instructions and start to build up the edges of the hole with small blobs. Repairing Small Holes in PlasterboardĪny holes smaller than about 15mm wide can quickly and cheaply be fixed using standard wall filler. Here we will take a look at repairing small and medium holes (up to about 120mm wide) in plasterboard. There are several methods for repairing holes, but not all are suitable for all sizes of hole. The ability to repair holes in plasterboard walls depends a lot on the size of the hole in question.
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