White River Hardwoods
Mason’s Mill & Lumber is proud to be a distribution partner for White River Hardwoods, a Fayetteville, Arkansas manufacturer known for solid hardwood tambour panels, ornamental mouldings, hand-carved woodcarvings, and other architectural surface products.
Why specify White River Hardwoods?
White River offers a complete range of decorative architectural products, making it easier to source multiple elements of a room from one manufacturer. Instead of sourcing tambour from one vendor, mouldings from another, and architectural details from a third, designers and builders can find everything from flat paneling and curved tambour to crown and base mouldings, corbels, capitals, radius corners, and stone veneer in one catalog.
White River at a Glance
- 3,000+ profiles across five moulding collections; 10,000+ total SKUs
- Manufactured in the USA — Fayetteville, Arkansas
- Ships unfinished; accepts stain or paint
- Solid North American hardwoods: Red Oak, Hard Maple, Poplar, White Oak, Walnut, Cherry
- Custom profiles, custom CNC, and coffered ceiling systems available
- Priming and sanding services available in three tiers
- 50+ years manufacturing decorative millwork; distribution in 50 states and 27+ countries
Browse White River Hardwoods
Thermac Ash Light Roast — CUTEK® Extreme Clear Finish
Thermac Ash Light Roast is a thermally modified White Ash produced by Bingaman & Son Lumber, one of the leading domestic manufacturers of thermally modified hardwoods in North America. Sourced from responsibly managed Appalachian and Pennsylvania forests, the ash is transformed through a chemical-free process that uses only heat and steam — no chemicals, plastics, or additives — sustained for 14–16 hours in an oxygen-deprived kiln. The "Light Roast" designation refers to a lower peak modification temperature, producing a warm caramel-to-amber tone rather than the deeper chocolate brown of a standard or dark roast. The result is a domestic hardwood with the color character of exotic species like teak or light walnut, while retaining more of ash's natural grain contrast and figure.
The performance story is where thermally modified ash really shines. The modification process breaks down the sugars and hemicellulose that fungi and insects feed on, and permanently reduces the wood's ability to absorb moisture — by as much as 45% compared to untreated ash. Independent testing per EN 350 standards rates thermally modified ash at Durability Class 1 ("very durable"), placing it in the same durability tier as tropical hardwoods like teak and ipe, with an expected exterior service life of 25+ years. Dimensional stability improves dramatically as well: radial and tangential shrinkage drop to under 1%, virtually eliminating the cupping, warping, and seam-opening that plague untreated ash outdoors.
Each board is finished with CUTEK® Extreme Clear, a penetrating oil engineered to stabilize exterior wood from the inside out. Rather than forming a surface film like paint or varnish, CUTEK® carries its oils deep into the wood fibers, where they work continuously to slow moisture movement — the primary cause of cupping, checking, and end-splitting. Because the finish penetrates rather than coats, it cannot peel or flake, and maintenance requires no sanding or stripping — just clean the surface and reapply when it looks dry. The clear formulation adds no pigment, allowing the Light Roast's warm caramel tone to show through initially before gradually silvering to a soft gray patina if left unmaintained with a colortone.
Ideal for high-end exterior siding, cladding, soffits, porch ceilings, feature walls, and covered outdoor living spaces where the warmth of a lightly roasted domestic hardwood is preferred over the deeper tones of standard thermally modified ash.
Specifications
| Spec | Detail |
|---|---|
| Species | White Ash (Fraxinus americana) — thermally modified |
| Product Line | Thermac by Bingaman & Son Lumber |
| Modification Level | Light Roast — lower-temperature thermal modification for lighter tone |
| Origin | Appalachian / Pennsylvania hardwood, USA |
| Modification Process | Heat and steam only, no chemicals; oxygen-deprived kiln for 14–16 hours |
| Finish | CUTEK® Extreme Clear (penetrating oil) |
| Finish Type | Oil-based, non-film-forming |
| Color | Warm caramel-to-amber brown; consistent through full board thickness |
| Weathering | Silvers to gray patina over time if not maintained with colortone |
| Durability Class | Class 1 ("very durable") per EN 350 |
| Janka Hardness | ~820–1,325 lbf (varies by modification intensity) |
| Dimensional Stability | Radial shrinkage ~0.1–1.0%; tangential ~0.4–1.0% — significantly improved vs. untreated ash |
| Density | ~554 kg/m³ post-modification (roughly 12% lighter than untreated ash) |
| Equilibrium Moisture Content | ~4–6% (vs. 18–22% for untreated ash) |
| Water Absorption | Reduced 60–70% vs. untreated ash |
| Service Life | 25+ years in exterior applications with proper maintenance |
| Fire Rating | Class B/C flame spread achievable (ASTM E84) |
| Applications | Exterior siding, cladding, soffits, porch ceilings, feature walls, decking, trim |
| Fixings | Stainless steel recommended; pre-drilling advised near board ends |
| Maintenance | Clean and re-oil with Cutek Extreme as needed — no sanding or stripping required |
| Sustainability | Domestic hardwood from sustainably managed forests; chemical-free modification |
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Let Mason's MillHelp You Choose
With seven product lines, more than 3,000 profiles, and a wide selection of wood species, there’s a lot to consider when choosing the right White River products for a project.
The best option often depends on details that don’t always show up on a spec sheet, like whether the wall is flat or curved, whether the space needs to balance acoustics with its overall design, or whether the new woodwork needs to match existing cabinetry or other finishes.
Tell us a little about your project and what you’re looking to accomplish, and our team can help narrow the options down to the profiles and products that make the most sense for your application.
Frequently Asked Questions
Tambour panels are solid hardwood slat panels on a flexible backing, used for feature walls, kitchen island waterfalls, curved reception desks, columns, cabinetry faces, and casework. The flexible backing lets one panel wrap curves and outside corners that rigid paneling cannot.
No. Tambour panels are not suitable for wet or high-humidity environments, including showers, bathrooms, and pools. Installation in high-moisture conditions may void the warranty.
Red Oak, Hard Maple, Poplar, White Oak, and Walnut. All panels ship unfinished and accept any stain or paint.
Standard tambour panels have a 7–10 business day lead time. Custom panels to spec, up to 120" wide, are also available.
In rooms with strong parallel reflective surfaces, covering 25–40% of total surface area gives a meaningful acoustic improvement. One carton of Harmony Series panels covers approximately 16.41 sq. ft.
No. All mouldings ship unfinished and accept stain or paint. Priming and sanding services are available in three tiers, and Mason's Mill offers factory-applied finishes.
Mon Reale uses a fine-grain overlay contoured onto solid Poplar for high-relief ornamental detail across 142 profiles. Traditional mouldings are milled entirely from solid clear Poplar in 219 plainer, classically proportioned profiles.
Yes. A resin option is available for curved walls, columns, and radius ceilings on both the Mon Reale and traditional lines. Tambour panels wrap curves directly with no special option needed.
Yes. Tambour panels, mouldings, and MDF radius corners are manufactured in the USA at White River's Fayetteville, Arkansas facility. Select carvings are also USA-made.
Mason's Mill & Lumber Co. is a White River distribution partner and supplies the full catalog, including custom milling and factory finishing. Request a quote below or contact our sales team at sales@masonsmillandlumber.com.
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