In the millwork industry, the word “Solid” is often used loosely. A consumer walking into a big-box retailer might see a stair tread labeled “Oak Tread,” assuming it is a solid plank of wood. In reality, much of the mass-market inventory is Engineered Veneer—a core of plywood or finger-jointed scraps wrapped in a thin (2mm-3mm) layer of hardwood.
At Unique Wood Products, we manufacture exclusively using Solid Edge-Glued Face Grain construction. For the custom builder, understanding the difference between these manufacturing methods is essential for explaining value to the homeowner.
The Anatomy of an Engineered Tread
Engineered treads are designed for stability and low cost. They typically consist of a particleboard or plywood core with a “wear layer” of hardwood glued to the top and front.
- Pros: They are dimensionally stable and cheaper to produce.
- Cons: The wear layer is thin. If the tread is scratched deeply, the repair is difficult. More importantly, an engineered tread has a limited lifespan. It can typically only be sanded and refinished once (if at all) before sanding through to the core.
The UWP Standard: Edge-Glued Face Grain
Our treads are 100% solid hardwood through the entire 1-inch thickness. However, we do not simply cut a 12-inch wide slab from a log. Using a single wide board for a tread is a recipe for disaster; the internal tension in a wide board will almost certainly cause it to cup or twist.
Instead, we use the Stave Method:
- Selection: We rip our lumber into narrower strips (staves), typically 2 to 4 inches wide.
- Orientation: We arrange these staves side-by-side, alternating the direction of the growth rings.
- Lamination: The staves are edge-glued under immense hydraulic pressure using Type II industrial PVA adhesive.
Why This Matters
By gluing multiple staves together with alternating grain directions, the internal forces of the wood cancel each other out. If one stave wants to cup up, the neighbor wants to cup down. The result is a balanced panel that stays flat.
The Lifecycle Value
The primary argument for Face-Grain construction is generational durability. A UWP tread has a full 1 inch of usable hardwood.
- Refinishing: Over a 50-year lifespan, a staircase may need to be refinished 3 or 4 times due to style changes or wear. A solid tread can be sanded down aggressively multiple times without ever hitting a plywood core.
- Repair: If a heavy object gouges the tread, a solid tread can be repaired, filled, and sanded blended perfectly. A veneer tread with a deep gouge is often a total loss.
For high-end custom homes, the staircase is a piece of furniture that is permanently attached to the structure. Installing solid face-grain treads ensures that this architectural feature can be maintained and renewed for decades, protecting the homeowner’s investment.
