Three classes of materials will be created in the code.Some materials such as brick, stone, and glass have a long history of proven architectural quality in a variety of applications as well as a strong compatibility with the historic building fabric of Minneapolis. Other materials, like fiber cement, represent an evolving list of products that combine several components or ingredients into one composite system, often in panelized form.
http://www.ci.minneapolis.mn.us/www/gro ... ent/wcmsp-