TSI Company LLC., is a mechanical insulation contractor, specializing in the Commercial & Light Industrial mechanical insulation field. With over 80 years combined experience we place a high value on customer satisfaction. TSI Company, LLC.is also a Wholesale-Distributor to the HVAC industry stocking over 4000 different items including registers and grilles, fire and fire/smoke dampers, flat sheet metal and sheet metal items, fiberglass ductboards, liners and wraps, adhesives and sealants. We also offer to the building contractors a complete line of building insulations (batts, blankets and sheathing boards), access doors (both flush mount and fire rated), and UL listed fire rated caulks.