Application/Assignement of material to exterior wall.

I cannot find materials; stucco or horizontal siding in the materials in any of the categories.  Is it possible that these do not exist in the library?  The library has not been changed or customized since it has been installed (ver  These materials need to be applied/assigned onto a CMU wall and an "exterior wall".  If the materials so not exist in the library, how do we add them?