• Kolbe & Kolbe Millwork Co.

• Kreider Brothes, Inc.

• La Puerta Originals

• Lambton Doors

• Landquist & Son, Inc.

• Lincoln Wood Products, Inc.

• Linford Brothers Glass Co.

• Loewen

• Loewen Windows

• Louisiana Pacific Corporation

• Lynden Door, Inc.

• M J Daley Manufacturing Company Ltd.

• MI Home Products Inc.

• Madawaska Doors Inc.

• Maple Leaf Forest Products Inc.

• Marshfield DoorSystems

• Marvin Windows and Doors

• Materials Unlimited

• Mercer Industries, Inc.

• Metropolitan Door Industries

• Milgard Windows

• Milgard Windows

• Morgan Manufacturing

• N & I Moroz Solution

• NanaWall Systems Inc.

• Niche Architectural Inc.