When you first installed your server rack, you only had a single server to install in it, but now that your business has expanded, you need to install more servers to handle the traffic. Before you simply start bolting your new servers in place, you need to take a very good look at the load carrying capacity of the rack you are currently using.
Your Server Rack Must Be Rated for the Load
If you try and add more weight to your server rack than it was built to handle, you are putting all of your equipment at risk. While that old rack might seem like it is handling the extra weight, you have no way of knowing when, not if, it is going to collapse under the load and drop all of your servers and peripherals on the floor. You can avoid this by making sure you upgrade your racks to units that are made to handle the load.