Concrete Repair and Cutting Specialists. BW Berch are leaders in the Concrete repair industry with over 29 years of experience and offer a range of services to meet any of your concrete needs. Spray Foundation coating is a polymer membrane used to waterproof foundation walls for new or old construction. The product we use is called Rub R Wall spray and is wrapped with a product called Geo Wrap. We can install a variety of long lasting and durable wraps to protect your foundation from water damage.