Most of the T&G you'll find at home centers and lumberyards is 1x6 or 1x8 spruce. But other wood options and sizes can be special-ordered. Some boards are rough on one face and smooth on the other. Others, like the 1x8 boards used here, have a groove down the middle of one face to give the impression of more, narrower boards. Most stores carry 1x4 beaded ceiling board as well. These tips apply to any of the styles.