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 Poplar — Cutek Extreme Clear Finish
Thermac Poplar is a thermally modified Appalachian hardwood produced by Bingaman & Son Lumber from native Pennsylvania yellow poplar. Using only heat and steam — no chemicals, plastics, or additives — the wood is heated in a low-oxygen environment to fundamentally alter its cell structure. This process removes the sugars and moisture that fungi and insects need to survive, while permanently reducing the wood's ability to absorb water. The result is a stable, rot-resistant hardwood with a warm, chocolate-brown color that runs consistently through the entire board, not just the surface.
Yellow poplar is particularly well-suited to thermal modification: it's a domestically abundant, fast-growing hardwood that emerges from the process with excellent dimensional stability, a smooth grain, and a rich color that rivals more exotic species. Independent testing on thermally modified yellow poplar has demonstrated Durability Class 1 ("very durable") performance against wood-destroying fungi, placing it in the same durability tier as many tropical hardwoods.
Each board is finished with Cutek Extreme Clear, a penetrating oil that migrates deep into the wood fibers rather than forming a surface film. Cutek's core function is dimensional stabilization — it works from inside the board to slow moisture movement, which is what causes cupping, checking, and end-splitting in exterior wood. Because the finish penetrates rather than coats, it cannot peel or flake, and maintenance requires no sanding or stripping — just clean the surface and re-apply when it looks dry. The clear formulation adds no pigment, so the poplar's natural thermally-modified brown will show through initially and gradually transition to a silver-gray patina if left unmaintained with a colortone.
Ideal for exterior siding, soffits, porch ceilings, cladding, and covered outdoor applications where a domestic hardwood with contemporary durability is desired.
Specifications
| Spec | Detail |
|---|---|
| Species | Yellow Poplar (Liriodendron tulipifera) — thermally modified |
| Product Line | Thermac by Bingaman & Son Lumber |
| Origin | Appalachian / Pennsylvania hardwood |
| Modification | Thermal modification — heat and steam only, no chemicals |
| Finish | Cutek Extreme Clear (penetrating oil) |
| Finish Type | Oil-based, non-film-forming |
| Color | Rich chocolate brown, consistent through the full board |
| Weathering | Silvers to gray patina over time if not maintained with colortone |
| Durability Class | Class 1 ("very durable") when tested per EN 350 standards |
| Janka Hardness | ~500–615 lbf (thermally modified yellow poplar) |
| Dimensional Stability | Significantly improved vs. untreated poplar; tangential/radial movement ~1.1–1.2% |
| Service Life | Designed for up to 25 years in exterior applications |
| Applications | Exterior siding, soffits, porch ceilings, cladding, covered outdoor living, trim |
| Maintenance | Clean and re-oil with Cutek Extreme as needed — no sanding or stripping required |
| Sustainability | Domestic, fast-growing hardwood; chemical-free modification process |
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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.