Proper subfloor preparation in necessary for a long lasting installation.  We carry Permabase and Hardibacker for traditional underlayments.  We have the largest inventory of Schluter Systems materials in the ND/SD region.  Ditra and Kerdi are highly recommended by the trades.  Schluter Systems has a complete installation systems for all types of interior and exterior projects from showers to balconies.  Whatever you need we have it.