This type of joint is called a dado. Tongue and groove boards can be used for many things, such as walls, ceilings, flooring, ...

Affordable and easy to install, tongue and groove is one of the simplest ways to bring warmth and texture to your interiors ...

"Instead, the pieces interlock through tongue-and-groove systems, allowing the entire floor to "float" above the surface," Bartlett said. "This method relies on the flooring's weight and friction ...

Though tongue-and-groove floor boards also lock together, it’s common practice to glue the joints to keep them from moving when they are walked upon. Likewise, you can only employ the nail-down ...