Contact Us

Great products and ideas don’t “just happen.” They evolve and improve as a company responds to challenges from its customers. For nearly a century as Macklanburg-Duncan and now as M-D Building Products, we have remained on the cutting edge of our industry, in large part because we believe in listening to our customers’ needs and expectations.

If you have a question, a problem or a need please contact M-D. We want to hear from you.


4041 N. Santa Fe Ave
Oklahoma City, OK 73118
United States


+1 (800) 654-8454
[email protected]

Sales and Contact Information – U.S.

  • M-D National Headquarters: 1-800-654-0007
  • M-D Customer Service: 1-800-654-8454
  • M-D Credit Department: 1-800-654-0003
  • M-D National Fax Service: 1-800-557-3568
  • Tower Sealants: 1-866-897-7568
  • Contact Via Email: [email protected]
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Sales and Contact Information – International

  • International Dept. Fax / Depto. Internacional Fax: 405-557-3586
  • International Dept. Phone / Depto. Internacional Tel: 405-557-3564
  • International Dept. Phone number from Mexico / Depto. Internacional – Linea exclusiva desde Mexico: 001-800-354-4451
  • International Sales Toll free number from Canada, Caribbean / Depto. Internacional telefono desde Canada y area del Caribe: 800-348-3834