Fir vs. Redwood for Decking - What is The Difference?

Last Updated May 21, 2025

Fir offers high strength and affordability for decking but requires regular maintenance to resist decay and insects. Redwood provides natural resistance to moisture and pests, making it a durable, low-maintenance option for outdoor decking.

Table of Comparison

Feature Fir Redwood
Durability Moderate, prone to decay without treatment High, naturally resistant to rot and insects
Cost Lower cost, budget-friendly option Higher cost, premium wood
Appearance Light color, smooth grain Rich reddish hue, attractive grain pattern
Maintenance Requires regular sealing and staining Low maintenance, retains color longer
Strength Good structural strength Strong and stable
Sustainability Widely available, often sourced sustainably Certified sustainable sources, eco-friendly choice

Introduction to Fir and Redwood for Decking

Fir decking offers excellent stability and affordability, making it a popular choice for outdoor projects. Redwood is prized for its natural resistance to decay and insects, along with its rich, red hue that enhances visual appeal. Both woods provide durable decking options, with fir typically requiring treatment for outdoor use, while redwood's inherent properties reduce maintenance needs.

Appearance and Color Differences

Fir decking features a straight grain with a pale yellow to light reddish-brown color that naturally weathers to a silvery gray if left untreated, offering a clean, uniform appearance. Redwood displays rich, warm hues ranging from light pink to deep reddish-brown, with prominent grain patterns and occasional knots that create a more textured, rustic look. Both woods develop a natural patina over time, but redwood's vibrant color and distinctive grain make it a popular choice for visually striking decks.

Durability and Lifespan

Redwood offers superior durability and natural resistance to decay and insects due to its high tannin content, making it ideal for long-lasting decking. Fir, while cost-effective and widely available, requires more frequent maintenance and treatment to withstand moisture and insect damage. Redwood decks typically have a lifespan of 20-30 years with minimal upkeep, whereas fir decks may last 10-15 years before significant repairs are needed.

Resistance to Weather and Decay

Fir decking offers moderate resistance to weather but requires regular sealing and maintenance to prevent decay, as it is more susceptible to moisture damage and insect infestation. Redwood naturally contains tannins that provide superior resistance to weather, moisture, and decay, making it a durable choice for outdoor decking with less frequent maintenance. The high durability of redwood compared to fir results in longer lifespan and better performance in harsh weather conditions.

Cost Comparison

Fir decking typically costs between $2 and $4 per linear foot, making it one of the more budget-friendly softwoods for outdoor projects. Redwood, known for its natural resistance and durability, generally ranges from $5 to $8 per linear foot, reflecting its premium quality and longer lifespan. Choosing fir offers significant upfront savings, while redwood's higher initial cost may be offset by reduced maintenance and replacement expenses over time.

Maintenance Requirements

Fir decking requires regular sealing and staining to protect against moisture and UV damage due to its softer wood fibers. Redwood naturally contains tannins and oils that provide resistance to decay and insects, reducing the frequency of maintenance like sealing or staining. Despite this, both wood types benefit from annual cleaning and inspection to maintain their appearance and structural integrity.

Environmental Impact and Sustainability

Fir decking offers a renewable resource with faster growth rates, enabling more frequent harvesting cycles and reduced pressure on forest ecosystems compared to Redwood. Redwood contains natural resins providing resistance to decay, which can extend deck lifespan and decrease the need for chemical treatments, supporting sustainability. Both woods require responsible sourcing certifications such as FSC to ensure sustainable forestry practices and minimal environmental impact.

Workability and Installation

Fir offers excellent workability due to its straight grain and softness, allowing easy cutting, shaping, and fastening during decking installation. Redwood also features good workability but is slightly denser, requiring sharper tools and more effort to cut, though it holds nails and screws securely without splitting. Both woods install efficiently, but fir's lighter weight can simplify handling and reduce labor time on deck projects.

Suitability for Various Climates

Fir decking offers moderate durability and performs well in temperate climates with low to moderate humidity, but it may require treatment to resist moisture and insect damage in wetter regions. Redwood is naturally resistant to decay, moisture, and insects, making it highly suitable for humid, coastal, and rainy environments where other woods might deteriorate quickly. Both woods benefit from regular maintenance, but redwood's inherent stability and resistance make it a superior choice for diverse and challenging climates.

Conclusion: Which is Better for Your Deck?

Redwood offers superior natural resistance to decay and insects, making it a durable choice for outdoor decking, while fir is more affordable but requires regular maintenance and treatment to prevent rot. The dense grain and rich reddish color of redwood not only enhance aesthetic appeal but also increase longevity in harsh weather conditions. Choosing redwood provides a longer-lasting, low-maintenance deck, whereas fir suits budget-conscious projects willing to invest in ongoing upkeep.

Fir vs. Redwood for Decking - What is The Difference?

Infographic: Fir vs Redwood for Decking



About the author. Kakani is a respected author and expert in materials for industrial and manufacturing applications. With years of experience in both research and industry.

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The information provided in this document is for general informational purposes only and is not guaranteed to be complete. While we strive to ensure the accuracy of the content, we cannot guarantee that the details mentioned are up-to-date or applicable to all scenarios. Topics about Fir vs Redwood for Decking are subject to change from time to time.

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