About Us


Our Story

In 1985, Michel Deffense and business partner started producing precast concrete gravity segmented walls in the United States and Canada. Originally designed and invented in Europe by German engineer Gerhard Hagenah, Michel Deffense and partner introduced the first Hagenah concrete block walls manufactured and built in the United States. Continuing with its success, SlopeBlock was founded in 1994 to deliver the best of German engineering to American industry.

Today our story continues, as we're commited to deliver quality concrete blocks across residential, commercial and governmental customers. Our business is dedicated to simplifying and reducing the cost for your erosion prevention project through our unique SlopeBlock units.


Photo of Michel Deffense

Michel Deffense

- Founder - (805) 490-1345 slopeblock1@gmail.com