While it's easy to think that every shelf only needs two brackets, many shelves need more. There are a few variables to consider, but in general, longer shelves will need more brackets. So, if you've ever wondered how many brackets per shelf, check out this post for a complete answer.
First, we've created an easy table with our basic guidelines to determine how many brackets are needed:
Two Brackets:
You'll see from the table that most shelves less than 3' (36") long, only two brackets are needed. This works because with adequate spacing, two shelves is enough to provide support down the whole shelf.
More Brackets:
However, you'll notice that as shelves get longer, more brackets are needed. The primary reason for this is that longer shelves will have weak spots with more spacing between brackets. It's important to provide support down the entire length of the shelf.
Without enough support they will bow, flex, and sag over time. Thinner shelves will weaken sooner but even thick shelves need additional support.
Additionally, when not enough brackets are used, it will actually put stress on the installed brackets possibly weakening them.
As an example, these 46" long shelves are supported with three heavy duty J brackets. While they may not seem especially long - they are thick, solid, white oak and need more support down the entire length of the shelf.
Conclusion
Hopefully this chart and description makes it easy to determine how many brackets per shelf for every project. Of course, every project is different and we encourage installers to consider all of the factors for their installation.
However, these general guidelines work well for kitchen shelves, pantry shelving systems, and even floating mantels. If you're not sure about what is needed for your specific project, please contact us - we're always happy to help.
