At what weight density is wood categorized?

Wood is typically categorized based on its weight density, which is measured in pounds per cubic foot (pcf). A weight density of 35 pcf is considered a standard threshold for the categorization of wood species into different classes. Most common softwoods, such as pine and fir, usually fall around this weight density, which allows for classification in terms of strength, applications, and suitability for various construction purposes.

In general, species below this threshold are often categorized as lightweight woods, making them more suitable for certain applications like furniture or lightweight framing, while those above this density may be used in more demanding structural roles. This particular categorization helps professionals in structural engineering and construction understand the properties of wood they are working with, ensuring appropriate selections depending on the needs of specific projects.