Sustainable Lumber Launched Montanafied Spruce Siding
The Missoula-based manufacturer released a new line of thermally modified exterior spruce siding products.
Updated on Oct. 6, 2026 in Landscaping
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Sustainable Lumber Company has officially released its new Montanafied Spruce siding, a chemical-free exterior product made from high-altitude Engelmann spruce. The siding utilizes a specialized thermal modification process to enhance durability and stability.
Why it matters
The new siding offers a sustainable alternative to treated wood by relying on heat and steam rather than chemical additives. Using a localized supply chain also reduces the environmental impact associated with long-distance transportation and industrial imports.
The siding is manufactured in 1x6 and 1x8 dimensions with lengths ranging from 8 to 16 feet, utilizing timber harvested within 150 miles of the Missoula facility. Finished boards exhibit a service life of 25 to 30-plus years.
The players
Sustainable Lumber Company
Based in Missoula, Montana, this manufacturer has produced high-end luxury hardwood flooring for over 15 years.
The details
The manufacturing process involves heating wood to 180-230C in a low-oxygen kiln to break down hemicelluloses and simple sugars. This method effectively reduces free hydroxyl groups, significantly lowering moisture content and improving the material's structural resilience.
Timeline
1915: Scientific work on thermal wood modification initially began.
1990s: Industrial thermal modification processes were refined at a commercial scale in Finland.
Past 15+ years: Sustainable Lumber Company established its history in hardwood flooring production.
Over the past year: The company conducted research, development, and process refinement.
October 6, 2026: Sustainable Lumber Company officially announced the availability of Montanafied Spruce.
Roadmap
This release marks a shift toward localized, chemical-free manufacturing within the high-performance exterior building materials sector. By applying the Finnish-refined thermal modification process to domestic spruce, the company competes with traditional chemical-treated lumber brands.
Homeowners in the Missoula area and beyond can now source exterior siding that requires no chemical preservatives for durability. The factory-direct shipping model provides a new procurement option for those seeking sustainably sourced materials within the continental United States.
The takeaway
Thermally modified wood provides a long-lasting, eco-friendly alternative to chemically treated exterior materials. Consumers should consider the service life and maintenance requirements of untreated versus modified wood when planning long-term home improvement projects.
What happens next
The company expects to release stained color options for the Montanafied Spruce line in the near future.
Further reading
Learn more about local exterior building options in the Landscaping section.
More information
Review the full product details and siding information on the company website.
Source note: This article includes information reported by Boston Star.
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