They can be purchased one shelf at a time or as a complete unit. Some shelving that is placed directly on the wall will use brackets to hold the them steady. Brackets also come in many different sizes, styles and materials. If shelving is needed for the inside of closets or is to be hung on doors then complete units are typically the most popular choice.
Floor-supported garage shelving is another site-built option. One method for constructing these is to form upright supports by running vertical 2x4 boards every 50 inches. Each 2x4 should rest on the floor and be attached to a rafter or ceiling joist at the top. Then, additional 2x4 boards are attached horizontally on edge between the uprights and particle board is used to create the shelf. Dimensions are usually 19-25 inches deep with 25 inches between each shelf. These are only suggested dimensions and can be adjusted to better accommodate the size of the items that will be stored.
Now look at the top shelf. Run all of your smaller sized books side by side across the top shelf. If you have multiple book cases side by side, run these books across all of them. The books should be all the same height if you can. And idealy they should run the complete width of the shelf. This will give a visual frame to the book shelf.
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