Knape & Vogt Mfg. Co.

Knauf Danoline

Knauf Insulation

KN Crowder

KNEER-SÜDFENSTER

Knight Wall Systems

Knoll

Knotwood

Kohltech International, Ltd.

Kommerling USA, Inc.

Koroseal

Koster American Corporation

Kovach

KP BuildingProducts

KPS Global

Kramer Window Company

Kroh-Wagner, Inc.

Kronos

Krukowski Stone Co. Inc.

Krylon

Kryton International Inc

Kudzu Millwork, Inc.

Kuiken Brothers

Kvadrat

KWP

LaCantina Doors

LafargeHolcim Ltd

La Finestra

L'AIR International

Lakeside Construction Fasteners

Lamilux

Laminam USA Inc.

Laminators Incorporated

Lamvin

Lanai Doors

Lanco Paints

Landmark Ceramics

Lane-Aire Mfg. Corp.

Lang exterior inc.

L'Antic Colonial

La Puerta Originals, Inc.

Laqfoil

L.A.S. Enterprises

Las Vegas Rock

Latexite - Dalton Enterprises, Inc.

LATICRETE International, Inc.

Laurenco Waterproofing / a division of FBC Chemical

Lawrence Roll-Up Doors, Inc.

Lawson Industries, Inc.

LDI Interiors

LEA Ceramiche

Lee Brick

Leesburg Concrete Co. Inc.

Legacy Industrial Corp.

Legacy Pre-Finishing Inc.

LeLand Furniture

Lemke Stone

LePage Millwork

Les Menuiseries Philibert

Le Specialiste du Bardeau de Cedre Inc. (SBC)

Les Portes Alain Bourassa Inc.

Lessard

Lester Building Systems

Levantina USA

Levolux

LEXCOR

Libart

Liberty Cedar

Liberty Hardware Mfg. Corp.

Lico

Life Science Products

Liko Partitions

Lili Tiles

LimeWorks.us

Limitless Walls

Lincoln Windows

Linder USA

LINEL

Line Systems

Lingrove

Liora Mann

Liquid Nails Brand

Liveroof - Hortech

LMCurbs

LM Flooring

LO&CO

Loctite

Loewen Windows

LOFTwall

Logs End Inc.

Lonestar Stone

Long Island Tinsmith Supply Corp.

Longleaf Lumber

Lonseal Flooring

Lorendo, Inc.

LP CanExel

LSI Floors

Lualdi

Ludowici Tile

Luma Solar