 VAUGHAN, Ontario--BUSINESS WIRE--WSB Titan Titan, a subsidiary of GMS Inc. NYSE: GMS, a leading North American specialty distributor of interior building products, today announced the completion of the acquisition of D.L. Building Materials, Inc. DL. Founded in 1988, DL is a leading supplier of wallboard, acoustical ceilings, steel framing, insulation and related building products serving Eastern Ontario and Western Quebec markets through two locations in Gatineau, QC and Kingston, 