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Learn About Our S4S Manufacturing Process!

Read about our advanced S4S manufacturing process powered by WEINIG  and other cutting-edge machinery.

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Download Our Full S4S Lumber Brochure!

Click below to download our full S4S  lumber brochure and learn more about our rigorous selection and state-of- the-art manufacturing process. 

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S4S Lumber (Surfaced Four Sides)

S4S is a dimension product typically used by retail lumber yards, millwork companies, and cabinet manufacturers. Every S4S board goes through a rigorous selection and state-of-the-art manufacturing process.

First, the proper lumber is selected for superior qualities such as grade, texture, and color consistency. Then, all the boards are surfaced to a hit and miss thickness on a Newman-Whitney EPR-24 Planer. This operation virtually eliminates cup and minor surface checking. The boards are then scanned for width and defect optimization by a Grecon Dimter Scanner and then gang-ripped on a Raimann Moving Blade Rip Saw.

Next, the boards are optimized for length and precision double end trimmed on a Grecon Dimter Opticut 350 Optimizing Saw System.

Finally, the boards are run through a Weinig outboard bearing high-speed molder that gives the finest molded S4S finish available on the market today.

Appalachian produces S4S products from most of the species we carry, although some are manufactured on a custom-order basis. Below is a list of our in-stock items in Red Oak and Poplar. 

3/4" x 1 1/2"
3/4" x 2"
3/4" x 2 1/2"
3/4" x 3"
3/4" x 3 1/2"
3/4" x 5 1/2"
3/4" x 7 1/4"
3/4" x 9 1/4"
3/4" x 11 1/4"

1" x 3 1/2"
1" x 5 1/2"
1" x 7 1/4"
1" x 9 1/4"
1" x 11 1/4"

1 3/4" x 3 1/2"
1 3/4" x 5 1/2"
1 3/4" x 7 1/4"
1 3/4" x 9 1/4"
1 3/4" x 11 1/4"