R.H. Lapp & Sons Incorporated is a provider of plumbing services. Operational for more than 25 years, the company offers customized design and installation services for all types of heating, ventilation and air conditioning systems. It provides sprinkler inspection and testing services for residential and commercial customers. R.H. Lapp & Sons Incorporated is also a licensed sprinkler contractor. The company specializes in backflow prevention, certification and mechanical contracting services. Its sheet metal fabrication shop is spread over an area of more than 12,000 square feet. Additionally, the company offers architectural roofing and siding services. R.H. Lapp & Sons Incorporated maintains its corporate headquarters in Cumberland, Md.