Stair Parts
Custom stair parts made to your exact specifications,
from classic designs to modern aesthetics.
Stair Parts & Custom Stair Components
Mason’s Mill & Lumber supplies custom stair parts and components for residential and commercial projects where detail, consistency, and fit matter.
From treads and risers to handrails, balusters, and newel posts, our stair parts are milled to specification using carefully selected hardwoods and proven production methods.
Stair Parts Custom Made in Mill 3
Balusters and Balustrade
Balusters are the vertical posts supporting the railing, working with the handrail to form the balustrade system. While three balusters per foot is standard, tighter spacing can add an elegant touch to your design.
Handrails
Handrails provide support and safety, resting horizontally or at an angle above the balusters. Smooth transitions in handrails are achieved using fittings like volutes, turnouts, or goosenecks, blending practicality with style.
Newel Posts
Newel posts are the larger vertical supports anchoring the balustrade system. Placed at key points—like the base, top, and turns of a staircase—they provide both structural support and a bold design element.
Treads and Risers
Treads are the horizontal steps you walk on, while risers are the vertical supports beneath them. For a sleek, modern look, risers can be omitted, creating an open tread design.
Nosing
The nosing is the edge of the tread or landing tread that extends beyond the riser, offering more walking surface and a polished appearance.
Fittings and Moldings
Fittings such as upeasings and goosenecks create smooth transitions when the handrail changes height or direction. Decorative moldings, like cove molding, enhance the design by covering joints between treads and risers.
Browse our Stair Treads
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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Why Choose Mason’s Mill & Lumber Co.?
Expert Craftsmanship
Our M3 Custom Millwork shop combines skilled artisanship with advanced machinery for superior quality.
Top-Quality Materials
We source the finest woods and materials to ensure lasting durability and beauty.
Endless Customization
Whether it’s traditional hardwood or a unique design, your staircase will be as functional as it is striking.
Personalized Service
We work with you from concept to completion, ensuring every detail meets your vision.
Frequently Asked Questions
We supply a full range of stair components, including treads, risers, handrails, balusters, newel posts, nosing, fittings, and related decorative profiles. Components can be ordered individually or as part of a complete stair package.
Yes. Stair parts can be milled to project-specific dimensions, profiles, and species. Custom sizing and detailing allow components to align with architectural drawings, existing conditions, or design intent.
We offer a wide selection of domestic and specialty hardwoods. Species availability may vary based on project requirements and lead times. Our team can help identify the best option based on appearance, durability, and performance needs.
In many cases, yes. We regularly work with projects that require stair parts to coordinate with flooring, trim, or other millwork elements. Providing samples or specifications helps ensure consistency.
Stair parts are typically supplied unfinished unless otherwise specified. Finishing options may be available depending on project scope and requirements. Our team can discuss what makes the most sense for your application.
Yes. We work with builders, designers, and stair professionals to review drawings, measurements, and requirements. While we don’t design or install staircases, we help ensure materials and profiles align with the intended use.
Yes. We support residential, multi-family, and commercial applications where quality, consistency, and fit are important.
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Custom stair parts and components.