Installing a ceiling molding crown can be easy and if you follow these steps and if you are precise in the work that need to be done. First you need to make sure which type of crown molding you want to use. Cut the corners of the molding. Measure and mark the wall. Cut the first measured piece. Cut the next piece to fit an inside corner. Understand how the pieces fit together. Cut the molding at a 45-degree angle. Cope the joint.
The images will show you how does it looks and there are some schemes that will show you how this should be properly installed.

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