Plywood
Our plywood inventory supports builders and cabinetry makers with dependable stock, clean faces, and flexible core options. Standard panels, custom layups, and specialty sheet goods—sourced to meet the demands of construction and production environments.
Plywood & Sheet Goods
At Mason’s Mill & Lumber, plywood isn’t an afterthought — it’s a working material. We stock and source sheet goods that builders and cabinetry makers rely on every day, with the consistency, face quality, and core options required for real jobsite and shop conditions.
From domestic NAUF and ULEF panels to specialty outdoor and moisture-resistant options, our inventory is built to support production schedules, not slow them down.
Custom Layups& Specialty Sheet Goods
For projects that need more than an off-the-rack panel, we offer custom plywood solutions through our sourcing and manufacturing partners.
Custom capabilities include:
Custom veneer layups
Different faces on each side (species-to-species or veneer to melamine)
Pre-finished custom panels
Cut-to-size options (within project scope)
- UV finishing
These solutions are typically handled job-by-job, allowing builders and cabinet shops to dial in exactly what the project requires — without over-ordering or unnecessary compromises.
If your project needs something specific, our team can help spec the panel before it ever shows up onsite.
Browse our Plywood Selection
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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Extensive Inventory, Ready to Work
We offer a deep selection of domestic and imported plywood, available in a wide range of species, cores, and thicknesses — typically from 1/4″ through 1″, with larger and specialty thicknesses available by request.
Available options include:
NAUF panels
ULEF certified plywood
MDF core and combination core stain-grade panels
MDF sheets from 1/4″ to 1-1/8″
MDO for exterior and formwork applications
Every product we stock is selected with flatness, consistency, and finish quality in mind — the things that matter once the sheet hits the saw or goes on the wall.
Frequently Asked Questions
We carry a wide range of domestic and imported plywood, including NAUF panels, ULEF-certified plywood, MDF core, combination core, MDO, and specialty sheet goods. Thicknesses typically range from 1/4″ to 1″, with additional options available by request.
Yes. We can source custom plywood layups on a project-by-project basis. Options include custom veneers, different faces on each side, melamine on one face with wood veneer on the other, and pre-finished panels depending on project requirements.
Cut-to-size services are available within reason and are typically handled as part of a larger project or custom order. Our team can help determine what makes sense based on your application and timeline.
For exterior and moisture-exposed applications, we stock MDO panels, Tricoya™ waterproof MDF with a 50-year rot warranty, and Modern Mill ACRE™ sheet goods designed for durability and long-term performance outdoors.
Our plywood and sheet goods are primarily used by builders, cabinetry shops, and millwork professionals working in residential and commercial construction. We focus on materials that perform well in jobsite and shop environments where consistency and availability matter.
Start your next Plywood Project with Mason's Mill today!
Let’s Spec It Right Whether you need stocked panels, a custom layup,
or help selecting the right sheet good for the job, our team is here to help.