Restoring the Past. Preserving the Future.
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About Us

Revolutionary products to clean, restore and protect new and historic masonry construction.

Diedrich Technologies, a division of Hohmann & Barnard, Inc., is the nation’s leader in high-performance detergent products for building restoration and maintenance.

When restoring old or new masonry construction, there are still some contractors who resort to surface-damaging old standbys like sandblasting or muriatic acid. But Diedrich’s advanced masonry cleaning products are specifically formulated to safely – and cost-effectively – reveal the beauty underneath all the built-up grime and paint.

Cleaning and restoring masonry with the correct Diedrich product also prevents mechanical deterioration of masonry surfaces, ensuring surface integrity and increasing the life of the building structure.

Diedrich detergent processes are approved for cleaning buildings on the National Register of Historic Places, and are ideal for countless historical restoration challenges from clay masonry cleaning to paint removal. Diedrich has been in business for over 35 years, and has sales representatives serving throughout the United States. Its products ship to over 2000 nationwide distributors.

In addition to our fine cleaning products, Diedrich offers:

  • Excellent technical support, including our toll-free number (1-800-283-3888) with knowledgeable support staff for all inquiries.
  • Free on-site training and technical support.
  • Nationwide distribution centers.
  • And more!




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