Quality Access Doors and Roof Flashing

quality access doorsElmdor Manufacturing Company, a division of Acorn Engineering Company, was founded in 1989. The company manufactures access doors using the principles of efficient design and the highest quality production standards.

Markets Morris Group Custom Products


Acorn Engineering Co Purchased Elmdor Stoneman

In 1995

Acorn Engineering Company purchased Stoneman Manufacturing Company, a producer of roof flashings with 40 years of industry experience. The two companies were merged to become Elmdor/Stoneman. Today, the company is one of the leading manufacturers of access doors, roof flashings, roof hatches, and trisolators.

Elmdor/Stoneman is proud serve the non-residential construction market with high-volume, low cost, quality access doors, roof flashings and roof hatches.