Writing chapters backwards

So, I don't write for that long but I think I found my method.

I realized that the final chapters of my current novel were all very vivid in my mind, so I began writing them. When you begin to develop the characters you stop at a certain point. This is where your Story starts and the rest of the development begins. The start of your story is therefore set before you even start writing.

I've always had problems with writers block and missing motivation. however now that I started to write it from the end to the beginning the story easily unfolds in my head. I also notice logic flaws fairly easily, a problem I had when writing straight from beginning to end.

So my question is: how common is this? I've read about people writing chapters as they come to mind, but never the method that is apparently best for me.