How Does Redwood Compare to Other Woods in Terms of Durability as a Building Material?

When selecting building materials, durability is a critical factor that influences both the longevity and maintenance costs of a structure. Redwood, a sought-after timber for its natural beauty and resistance to rot and insect damage, has its unique characteristics compared to other woods. This article explores the durability of redwood in comparison to its counterparts, focusing on its performance in various applications.

Introduction to Redwood

Redwood, scientifically known as Sequoia sempervirens, is a tall growing evergreen tree native to the coastal regions of California and Oregon. Its wood has been highly valued for its exceptional durability and performance in exterior applications due to its natural resistance to decay and insect damage.

Redwood Durability for Internal Work Framing and Rafters

Redwood is a suitable choice for internal work framing and rafters, especially when properly seasoned. This means the wood has been allowed to reach an equilibrium moisture content, which helps reduce volume changes and improves its performance. However, for more critical and load-bearing applications like major beams or structural work, it might be advisable to opt for harder woods. Common options include Douglas Fir and Eastern White Pine, known for their strength and durability in these applications.

Heartwood and External Applications

The heartwood of redwood is extremely durable and has been used wisely for roofing purposes. Its light weight and ease of splitting make it ideal for applications such as shingles and shakes. Despite these advantages, its specific gravity (SG) is relatively low compared to many other softwoods, which affects its strength. According to a specific gravity chart, redwood compared to other softwoods like pine, fir, and spruce, has lower strength due to its SG.

Comparing Redwood to Giant Sequoia

Redwood is distinguished from its close relative, the Giant Sequoia (Sequoiadendron gigantea), commonly known as the Big Tree. The Giant Sequoia has a much lower specific gravity, making its wood very brittle. The tremendous weight of these towering giants can cause them to shatter into small sections, rendering them unsuitable for construction.

Keywords and References

The most important performance metrics to consider when selecting wood for building applications are durability, strength, and specific gravity. For further reading, you can refer to the University of Kentucky for more information on the heartwood location and properties of redwood.