Oriole Basement Waterproofers, Inc. has been in business longer than any other waterproofing company in the state of Maryland (MHIC #4247). Established by Frank Pirog Sr. in 1953, our existence spans over 60 years and our combined experience spans over 100 years. No subcontractors. A Lifetime Guarantee is provided free of charge with all work/services performed. Oriole Basement Waterproofers has maintained an "A+" rating with the Better Business Bureau since joining the BBB in 1986. When considering our competitors, it is important to remember that a "Lifetime Guarantee" is only effective for as long as the basement waterproofing company is still in business. Family owned & operated for three generations, Oriole Basement Waterproofers, Inc. is the longest-standing basement waterproofing company in the state of Maryland.