WP4 Tongue & Groove

WP4 Tongue & Groove from Northern Crossarm is the rich, prefinished lumber product you’ve been waiting for.

Call 715-723-4100


The Nation’s #1 Brown Treated Wood Supplier

WP4 Tongue & Groove

Rich brown WP4 Tongue & Groove for interior and exterior applications – without the need to paint or stain! Our 1″ x 6″ WP4 T & G is the ideal addition to porches, walls, or your next DIY project. Not only does it look great, but it adds rich elegance to your indoor or outdoor space.

Brown WP4 Tongue & Groove Benefits

Find A Dealer

Looking for your nearest KDAT lumber dealer? We have stocking yards throughout the United States.

Brown WP4 Tongue & Groove Photo Gallery

WP4 Tongue & Groove FAQ & Information

Brown Treated Wood FAQ

Common Questions About Brown Treated Wood

Watch this short, 1-minute video about the 6 benefits of brown treated wood.

Northern Crossarm Company products brown treated wood products in all dimensional sizes. They are available in green (natural) wet, finished with a rich brown (wet), or as a KDAT (kiln dried after treatment) finished with brown coloring (dry).

We offer both options of brown treated (wet) and KDAT (brown). The exception is that our posts (4x4s, 6x6s), 5/4 patio decking, T1-11 shed siding, WP4 Tongue & Groove – all of these products are coated with a rich brown finish, but are not Kiln Dried After Treatment.

To find your nearest brown treated wood dealer or retail location, please give us a call at 715-723-4100, or send us an email with your name and zip code to sales@crossarm.com

WP4 Tongue & groove Resources

FREE 37-Page KDAT Lumber Guide

The Ultimate Guide to KDAT Lumber

Kiln Dried After Treatment (KDAT) wood is pressure treated lumber that’s been dried after the pressure treating process to deliver better resistance against warps, cups, twist and checks.

Brown Treated Wood Articles

90-Day Stocking Dealer Program

Try our top-selling KDAT for 90 days, risk free – if it doesn’t sell, we’ll pay to ship it back!