Waterproofing your basement is very important. It will protect your basement, which will in turn protect the integrity of your home and other things inside of your home. It's important to make sure that you have your basement waterproofed again before it becomes susceptible to water. In most cases, waterproofing should be done about every 10 years. However, it's important to find out if this is the case when you have the professionals tending to the job; ask them what their recommendation is.