Top 50x2: Irwin Stone and Kalkreuth Roofing & Sheet Metal

In this year’s special edition of Frederick Top 50x2, we are recognizing Frederick County’s most resilient businesses that have been serving our community for 20 years or more.  Each week we will be highlighting businesses and organizations that were selected for the publication.  These are the companies that prove that Frederick County is a great place to do business. 

Irwin Stone
275 Interstate Circle | Frederick
Established: 1938

Founders: Jack T. Irwin

Irwin Stone has been supplying homeowners, professional landscapers, masons and home improvement contractors for more than 60 years with a large variety of stone products, specializing in Natural Building Stone, Flagstone, Decorative Gravel, Boulders, Landscape Stone, Masonry Supplies, and Concrete products.

Why is Frederick County a great place to do business?

Up until 1998, our Rockville location was delivering a substantial amount of material to the Frederick area due to the increased development occurring here. We were looking to expand our business and we felt that Frederick was the perfect place for us. Frederick was close enough to Rockville to help each store support each other, but far enough away as to not cannibalize each other's business.

Kalkreuth Roofing & Sheet Metal
5726 Industry Lane | Frederick
Established: 1984

Founders: John Kalkreuth and Jim Hurley

Kalkreuth Roofing and Sheet Metal is one of the top 10 roofing contractors in the country and strives to maintain a progressive vision for the future. Kalkreuth specializes in complex commercial exterior envelope applications in various markets throughout the country. The company boasts an extensive project portfolio including clients in the automotive, chemical, government, education and healthcare industries. With a wealth of resources and an extensive construction industry network, Kalkreuth has the capabilities to complete any project according to specifications.

What is your advice to a young company?

Structure is important.  Meetings help keep everyone accountable and on the same page.

Frederick County is very fortunate to have an amazing business community, especially those that have been in business for over 20 years.  We understand that there are more than 100 legacy businesses in Frederick County, but unfortunately, we were not able to include all these businesses in the Top 50x2.  The businesses included were selected from responses submitted to a business survey.  OED staff verified the responses and then selected the businesses on a first come first serve basis.  If your business would like to be included in future opportunities, please email

Some photographs included in the publication were taken pre-COVID.  OED encourages everyone to follow precautionary guidelines set forth by the Frederick County Health Department.