For our SK branch, please call (306) 525-4976 Gypsum Drywall Interiors (GDI) has been operating for over 20 years and has grown continually over this period. GDI works with the largest, most professional general contractors and home builders in Manitoba. GDI always places safety first and backs this by operating as a COR safety program certified company. GDI works primarily within Manitoba, in the areas of commercial, multi-family and residential construction. Completing projects from Thunder Bay, Ontario in the east, as well as in Saskatchewan and Alberta to the west. With five principals and a dedicated office staff of 21; GDI operates with an average workforce of tradespeople that is more than 100 strong.