Rough Lumber
Mason’s Mill & Lumber Co. stocks over 1,000,000 board feet of rough lumber — rough sawn and rough cut hardwoods and softwoods in thicknesses from 4/4 to 16/4. Every board is sourced from the industry’s top domestic and import sawmills and graded to the highest available standard, from FAS and Select to character-grade stock with visible mineral streaks and knots. If a species or size isn’t sitting on our racks in Houston, our supply network can usually source it fast.
Rough Sawn & Rough Cut Hardwoods and Softwoods
This catalog covers the full range of rough lumber for interior and exterior work — furniture, cabinetry, architectural millwork, decking, siding, and structural applications — including Kebony®, thermally modified and FSC®-certified options like Accoya® and Thermory for projects that need 25+ years of durability without chemical treatment.
Explore Our Rough Lumber 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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Species We Stock
Domestic Hardwoods
Rift Sawn & Quarter Sawn White Oak, Character White Oak, Cherry, Hard Maple, Hickory, Ash, and Superior (Select) Alder — sourced from top-grade mills in Pennsylvania, Indiana, and the Pacific Northwest.
Softwoods
Douglas Fir, Cypress, Clear Southern Yellow Pine, Aromatic Cedar, and reclaimed Antique Pine with natural patina and saw-mark character.
Modified & exotic wood
Thermory, Accoya (50-year above-ground warranty, 70% FSC-certified), Kebony, and Ipe all built for exterior applications where stability and rot resistance matter most.
Don’t see the species you need? Our supply network sources rare and non-stock lumber on request
contact our team with your specs.
Grading Standards:
Every board in our inventory is graded before it reaches our racks, so you know what you’re getting before you order a sample:
FAS (First and Seconds): the highest hardwood grade — largely clear faces, minimal defects.
Select: slightly more character than FAS, still highly usable clear-face yield.
Character grade: natural mineral streaks, sound knots, and heart/sap color variation for a rustic, one-of-a-kind look..
We source exclusively from the industry’s top domestic and import sawmills, so grading is consistent from board to board — critical when you’re matching stock across a large order.
Rough Lumber for Interior and Exterior Applications
Rough lumber from Mason’s Mill goes into:
Interior: furniture, cabinetry, architectural millwork, flooring substrate, paneling, and custom moulding stock (see our 8,000+ moulding profiles)
Exterior: decking, siding, fencing, and ground-contact applications using naturally durable or modified species like Ipe, Accoya®, Kebony®, and Cypress
Structural & specialty: timber-frame beams, mantels, and reclaimed/antique stock for restoration work
Frequently Asked Questions
Rough lumber hasn't been planed — it retains full nominal thickness and visible saw marks. S2S (surfaced two sides) and S4S (surfaced four sides) lumber has been milled smooth and is ready to build with, at a slightly reduced final thickness and a higher price per board foot.
Standard nominal thicknesses run 4/4 (1"), 5/4 (1‑1/4"), 6/4 (1‑1/2"), and 8/4 (2"), up to 16/4 (4") for heavy timbers. Mason's Mill stocks the full range across our hardwood and softwood species.
Price varies by species, grade, and thickness — from budget domestic softwoods to premium modified woods like Accoya® and Kebony®. Order a $10 sample to check color, grain, and quality before committing to a full order; the sample fee is credited toward your purchase.
Yes — Ipe, Accoya®, Kebony®, Cypress, and Western Red Cedar are all stocked specifically for exterior and ground-contact durability, with Accoya® and Kebony® backed by FSC® certification and long-term warranties.
Yes, Mason's Mill ships rough lumber nationwide in addition to local Houston pickup and delivery.
Our supply network can source rare or non-stock rough lumber on request — reach out with your specs and we'll confirm availability and lead time.