You only require a small amount of plaster for this stage. Once the hole is blocked, you are ready to mix up some plaster (the above photo has been blocked from the top, which is the best form of block because there are no gaps). Plaster ceiling hole for chimney flue with back block. There are a few methods to patching, but i find this the quickest and easiest. Plaster can be put on at different thicknesses, making it easier to get a level finish. It is ideal to put a screw or nail in the middle of the block to be able to pull it back down before fixing the block with a few screws around the edges, this creates a block to patch up to. If you cannot access the roof space to put the block over the hole, you will need to cut the block as a rectangle and push it up through the hole and then pull it back down. Measure the hole and cut a piece of gyprock or thin timber about 30mm wider than the hole all round, if you can access the top inside the roof space. It is important to sweep any dust from the area above before you begin. First determine whether the hole needs to be cut nicely before patching (inexperienced patchers may find this easier). ![]() Having a stable ladder in a good position to reach the work area without having to strain is a must. When starting out it is a good idea to put down a drop sheet to avoid splatter on clean surfaces and ensure that the work area is not cluttered where possible.
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