Carpentry Precision Exam Practice 2025 - Free Carpentry Practice Questions and Study Guide

Landscape timbers are commonly made from pressure-treated lumber. This type of wood has been chemically treated to resist decay, insects, and environmental factors which makes it suitable for outdoor applications like landscaping, borders, or retaining walls. The pressure treatment process extends the longevity of the wood, allowing it to withstand moisture and other elements that could cause untreated wood to rot or deteriorate quickly.

Softwood, hardwood, and composite materials, while they can be used in various carpentry and landscaping applications, do not offer the same level of durability against the specific environmental challenges that landscape timbers face. Softwoods and hardwoods are typically used for different types of construction or furniture projects rather than for landscape structures. Composite materials may provide benefits like lower maintenance and sustainability, but they do not have the traditional ruggedness and availability that pressure-treated lumber offers for landscape use. Thus, the preference for pressure-treated lumber in making landscape timbers is based on its effectiveness and practicality for outdoor installations.