Perhaps you will get problems on the floor that can disturb the stabilize of a bookcase, then there is rise a question how to stabilize a bookcase. The problems come when the material of the floor have been labile, or the base of the book case have broken caused the termite or the cold temperature at your room that the bookcase placed. So it can cause the bookcase unstable to stand.
You can follow the easy ways how to stabilize a bookcase, you just need to be patient and do the ways in gently.
1. Make the bookcase empty by removing all items on it.
2. Slide the book case if needed with helping your friends to move it away from the wall then you can see the broken floor.
3. Check the surface of the base bookcase to find broken element on it.
4. Clean the debris of broken floor then make a batter concrete from the cement and water then attach them to the broken area on the floor.
5. Caulking the broken bookcase element with special caulk fro wood. Do it in tidy.
6. Repaint the bookcase to look different.
7. Hide the caulking floor with rugs after you clean the floor.
8. Move the bookcase to the early place then if it is needed make good ventilation to regulate the air and temperature in right way.
Those are the simple and easy ways how to stabilize a bookcase, with letting the unstable bookcase your room will look untidy. So, follow the instructions above to solve the problems. Make your bookcase in good condition again as soon as possible.