What is the nominal depth of plates in conventional light-frame construction?

In conventional light-frame construction, the nominal depth of plates typically refers to the thickness of the lumber used for the structural elements. The standard depth for plates, which include elements such as top and bottom plates in wall framing, is commonly 2 inches. This is based on the dimensions of typical lumber, where a 2x4 or 2x6 piece actually measures approximately 1.5 inches in thickness due to the machining processes in the sawmill.

Using 2-inch nominal dimensions aligns with common building practices and ensures that the framing can provide adequate support and stability while allowing standard lumber sizes to be used effectively. Therefore, understanding the nominal sizes of framing lumber is crucial for anyone involved in design, construction, or inspection of buildings, as it directly impacts the load distribution and overall integrity of the structure.