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In the world of sustainable building materials, few wood products stand out as much as Accoya® and Thermory®. These two premium exterior wood options are known for their durability, dimensional stability, and environmentally friendly treatment processes. But which one is the best choice for your siding, decking, cladding, or rainscreen project? At Black's Farmwood®, we have helped architects, builders, and homeowners across the Bay Area select the right exterior wood products for decades. In this post, we will break down the similarities and differences between Accoya® and Thermory®, allowing you to make an informed decision.
What Is Accoya® Accoya® is a modified wood made from fast-growing Radiata Pine. It undergoes a non-toxic acetylation process that alters the wood at the molecular level, enhancing durability, insect resistance, and dimensional stability. The result is a wood product that performs exceptionally well in even the most demanding climates. Top Benefits of Accoya® • 50 year above ground warranty • Exceptional stability for cladding, window trim, and siding • FSC-certified and sustainably harvested • Available as Accoya® Natural or Accoya® Grey, which is stained through the full-thickness • Ideal for paint, stain, or natural weathering to silver  Accoya Grey Decking What Is Thermory® Thermory® is real wood that has been thermally modified using only heat and steam. By heating the wood to high temperatures in a controlled environment, the natural sugars are removed, and the structure is changed to reduce moisture absorption and improve rot resistance. Thermory® is available in multiple species, including thermally modified Ash, Spruce, and Pine. It offers beautiful natural color, strong performance, and a variety of textures and finishes. Top Benefits of Thermory® • Up to 30 years of durability above ground • Rich brown tones that naturally weather to grey • Available pre-finished or unfinished, depending on the collection • Sustainably sourced with FSC options available • Offered in multiple widths, profiles, and grain patterns  Thermory Ash Decking How Accoya® and Thermory® Are Similar Both Accoya® and Thermory® are: • Real wood products with no plastic or composite materials • Modified using non-toxic processes to enhance durability • Excellent choices for decking, siding, and cladding in wet or coastal environments • Available unfinished to allow for natural greying • Sustainable alternatives to tropical hardwoods like Ipe and Cumaru • Used in high-end residential and commercial projects throughout the San Francisco Bay Area How Accoya® and Thermory® Are Different
When to Choose Accoya® Choose Accoya® if you: • Want the most stable exterior wood for vertical or horizontal siding • Need an FSC-certified product with an extended warranty • Are using opaque paint or a semi-transparent stain • Require custom milled profiles for tongue and groove, board and batten, or rainscreen • Are working on a LEED-certified or public project requiring chain-of-custody documentation When to Choose Thermory® Thermory® may be the better option if you: • Prefer a natural, rich brown tone without staining • Want a slightly more rustic look or deeper grain variation • Need a budget-friendly option with solid durability • Like the idea of a prefinished product in collections like Vivid or Benchmark • Want a wood that performs well with minimal maintenance in coastal environments Let Us Help You Decide At Black's Farmwood®, we specialize in helping clients throughout the Bay Area choose the right sustainable exterior wood products. We stock and custom-mill both Accoya® and Thermory®, and we have samples available in our Petaluma showroom. We are happy to walk you through options for: • Tongue and groove siding • Decking with hidden fasteners • Rainscreen and nickel gap profiles • Custom trim packages and matched finishes Visit Our Showroom or Get in Touch Visit our Petaluma showroom to view samples and discuss your project with our team: Black's Farmwood® 1364 N McDowell Blvd. Unit 25 Petaluma, CA 94954 Request a quote at [email protected] or call us at 707-971-7405  Final Thoughts
Both Accoya® and Thermory® offer long-lasting beauty, sustainability, and exceptional performance. Your decision depends on your design vision, maintenance expectations, and budget. Whether you are building a new home in Sonoma or replacing siding on a coastal retreat in Santa Cruz, we are here to help you every step of the way. Comments are closed.
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June 2025
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