Aside from earthquakes, fires, and natural disasters, one of the more serious problems a structure faces are foundational issues. Wet soil can lead to a building’s foundation swelling or losing its strength. Below-grade waterproofing membranes protect porous and crack-prone concrete foundations from water seepage. They are designed to be both flexible and durable and provide an additional layer of protection to a roll-on bituminous coating system, often referred to as asphalt coating.

New construction projects often utilize positive side waterproofing membranes on the foundation. Soil composition, the presence of water contaminants, and the slope are just a few of the many factors that are taken into consideration when choosing the most appropriate waterproofing system on a project. Contact us today to discuss the specifics of your project.


  • Elevator Pits
  • Retaining Walls

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Proudly Servicing Southern California and Arizona

Sanders & Wohrman is a family-owned company specializing in commercial and industrial painting, caulking, and coatings. We have been in business since 1979 and have been honored to partner alongside various General Contractors, Property Owners, and Management Companies in Southern California and Arizona on a variety of projects.

We are capable of performing jobs of any duration and complexity, and feel that our bid proposals are always competitive with those who offer professional painting, caulking, and coating services. We are confident that you will always be satisfied with our work and professionalism.

Our teams are led by full-time superintendents who visit job sites daily to oversee quality control, logistics, and manpower. All our labor and materials are backed by industry standard warranties. Speak with us today to see how we can best partner with you on your next project.