A 2x8 lumber board has a thickness of 1.5" and a width of 7.5".  2x8s come in various lengths.

2x8 boards are used for projects requiring greater strength and support, such as:

• Floor joists (providing structural support in flooring systems).
• Roof rafters (supporting roof loads).
• Deck framing (like beams and joists in decks).
• General construction or large-scale woodworking projects.

2x8s are particularly useful when strength, stability, and a larger width are necessary. Let me know if you need more details about wood grades or specific applications!