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Thermally Modified Woods

Longevity, Durability, and Stability

What is Thermally Modified Wood

Wood has been a fundamental building material throughout history, valued for its unmatched versatility. However, natural wood can be vulnerable to environmental challenges, particularly in outdoor applications.

To overcome these challenges, various modification techniques have been developed. Among them, thermal modification is a standout, enhancing wood’s durability and stability through a chemical-free process.

Benefits of Thermally Modified Wood

Thermal modification enhances wood’s stability and performance by drastically reducing its moisture content, often by up to 60%. This process changes the wood’s cellular structure, providing key benefits such as:

Thermally modified wood resists fungal attacks by eliminating the nutrients mold and insects rely on, providing enhanced durability and longevity.

Thermally modified wood is highly resistant to cupping and warping caused by humidity and weather changes, ensuring the boards remain straight, stable, and ready to use.

Thermally modified wood features rich, darker tones that vary based on cooking temperature and species. Like standard wood, it will naturally weather to a gray color over time if left untreated.

Thermally modified wood is highly versatile, perfect for both interior and exterior applications such as siding, rain screens, facades, decking, trim, millwork, furniture, and even instruments. Its enhanced stability and performance make it a go-to material for architects, designers, contractors, and craftsmen. The thermal modification process transforms the entire board, allowing it to be cut, planed, sanded, and worked just like traditional wood.

Shop Thermally Modified Samples

Longevity, Durability, Stability—Naturally Enhanced.

In Stock Thermally Modified Wood

Mason’s Mill & Lumber offers an array of thermally modified wood options.

Ash

Thermally modified Ash offers a bold grain and lasting strength, making it a strong choice for high-end interior work. Thermal modification deepens its natural color and improves resistance to moisture, movement, and decay—all without chemicals. Ideal for wall cladding, ceilings, and custom millwork, thermally modified ash brings warmth, depth, and dependable performance to any space.

Poplar

Thermally modified is an ideal choice for interior applications where stability, sustainability, and rich tone matter. Thermally modified poplar is treated with just heat and steam—no chemicals—resulting in improved resistance to moisture, warping, and decay. With its smooth grain and warm, caramel color, it’s well-suited for paneling, millwork, and architectural accents that call for a clean, modern finish.

Ayous

Thermally modified Ayous features a smooth, even grain and consistent color, making it a great fit for contemporary interiors. Lightweight and stable, it’s treated with heat and steam to improve resistance to moisture and movement. The result is a rich-toned wood ideal for interior cladding, ceilings, and millwork—delivering a clean, modern look with reliable performance.

VG Pine

Thermally modified VG Pine offers a clean, straight grain with added stability and moisture resistance. This treatment enhances the durability of a classic softwood, making it well-suited for interior paneling, ceilings, and trim work. With its warm, honey tone and uniform appearance, VG Pine brings timeless character to both traditional and modern spaces.

VG Hemlock

Thermally modified VG Hemlock features a straight, uniform grain and a warm, even tone—well-suited for clean, modern interiors. The thermal process improves its stability and moisture resistance, making it a dependable option for wall cladding, ceilings, and custom millwork. With a smooth texture and consistent look, VG Hemlock offers natural beauty with the durability to match.

Spruce

Thermally modified Spruce pairs lightweight versatility with improved durability, making it a reliable option for interior wall and ceiling cladding. Treated with just heat and steam, it offers better stability and moisture resistance while taking on a warm, golden tone. Its soft grain and clean look make it a natural fit for interiors that call for subtle texture and lasting performance.

Red Oak

Thermally modified Red Oak combines the bold, familiar grain of traditional red oak with increased durability and stability. The heat and steam process enriches its color and boosts resistance to moisture, movement, and decay—without the use of chemicals. It’s a strong choice for interior flooring, paneling, and custom millwork, delivering classic character with improved performance.

Clear Pine

Thermally modified Clear Pine features a smooth, knot-free surface and a warm, even tone—well-suited for clean, modern interiors. The thermal process enhances its resistance to moisture, shrinkage, and warping, making it a smart choice for interior wall paneling, ceilings, and trim. With its refined look and added stability, it offers a balance of style and performance for both residential and commercial projects.

Knotty Pine

Thermally modified Knotty Pine brings warmth and rustic character to interior spaces, featuring its signature knots and a rich, golden tone. The thermal process enhances durability, reducing moisture absorption, warping, and decay. Ideal for wall paneling, ceilings, and accent features, it blends natural texture with the long-term performance today’s interiors demand.

Pre-Finishing Available

Custom prefinishing is available for all thermally modified species.

Choose from a range of sheens, with optional double-filling for a smooth, even surface.

Skip the extra steps—our professional prefinish highlights the natural beauty of the wood while adding long-lasting protection and performance.

prefinishing

Thermally Modified Woods

Let’s start your modified wood order today!


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