Knowles Industrial Services Corporation

Knowles Industrial Services Corporation is a concrete and masonry company. Its website lists concrete repair, shotcrete and gunite, masonry restoration, pressure grouting, waterproofing, resinous flooring and air barrier installation, and the company says it has been in business 102 years. Its BBB profile describes it as servicing only commercial locations. News sites have named the company, of Gorham, for concrete repairs and for pressure grouting. The BBB grades it A+, and on Google it holds 3.2 stars from 14 ratings. A 2025 Google reviewer praised the quality of its concrete and masonry work. A 2024 Google reviewer complained that the company ignored noise ordinances. A 2025 Google reviewer said its trucks went over 85 mph on the interstate. A recent Google reviewer said one of its drivers, in a Ford F350, blew through a stop sign at a busy intersection in town.