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Surfaced on 2 Sides What does S2S mean? All of our lumber is surfaced on two sides, or S2S for short - the faces are planed and the edges are rough (all though we can surface the edges for you as well). The actual thickness of our 4/4 S2S lumber is 13/16? or greater; 8/4 S2S lumber measures 1-13/16? thick and so on. See pictures below. Why is your lumber S2S? The term for un-surfaced hardwood lumber is "rough" and such lumber requires surfacing to achieve a good working face. Lumber is typically sawn from a log using heavy-duty machinery which does not leave the faces or edges smooth. In addition, the process of kiln drying causes the wood to cup and/or distort. Surfacing must be done before any other operations can be performed and we've had this done so your lumber will be flat and ready to work. Why isn't 4/4 lumber a full 1" thick? 4/4 lumber is rough sawn at 1-1/16" or so from the logs. Essentially, 4/4 lumber is a full 1"....but strictly as a raw product which is not ready for woodworking purposes. Planing lumber to achieve a smooth working surface results in loss of thickness. This is why 4/4 S2S lumber is not a full 1" thick. Such as with 1x6 (one-by-six) dimensioned lumber that you find in the large home improvement stores, these boards measure 3/4" x 5-1/2" instead of a full 1" thick and 6" wide because this was the rough sawn measurement. Here is a picture of a rough sawn 4/4 Hard Maple board:
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