When joining two matched boards into one, a tongue and groove joint is much stronger than a simple butt joint. The tongue and groove joint can be easily created using a router with a matched set of router bits, or on a table saw using a stacked dado blade set.
Tongue-and-groove boards are notorious for shrinking and expanding with changes in temperature and humidity. Unfinished tongue and groove boards installed in humid summer conditions can be an ugly mess during the dryness of winter.
For the tongue, move the fence forward so that you’re cutting away the edges of the board. Your goal is to leave the same amount of material on the tongue board as you cut away on the groove board. This will take at least two passes.
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Tongue & Groove pattern boards are great for wall and ceiling applications. This board features a reversible pattern that allows you to choose the best one to compliment your decor. Kiln dried for stability; Reversible pattern allows you to choose the best look to complement your décor