Take Back Your Basement Today!! At Cornerstone Basement Solutions, LLC we believe in doing the project right the first time. Cornerstone Basement Solutions, LLC is second to none. We want to be the company you call first and also to correct other company errors. The procedure to water proof your basement is one that is very important to the stability of your home, and that is how we treat each job. Thanks in advance in your trust to let Cornerstone Basement Solutions, LLC into your property.