Guardian Basement Waterproofing is a leader in the waterproofing industry with more than 25 years of experience serving the Maryland, Washington DC, Virginia, Delaware and Pennsylvania areas. Guardian’s skilled and knowledgeable technicians install state of the art basement waterproofing systems that completely and permanently stop foundation water leaks. Guardian specializes in basement waterproofing, basement finishing, crawl space waterproofing repair, and foundation repair in Baltimore, Anne Arundel, Harford and Howard County.