NEW!
MODIFIED COLLECTION
Designing exteriors with sustainable
Siding & Slat Panels just got even easier.
Meet the new Modified Collection – sustainably sourced, thermally modified, and finished to elevate every exterior space.
The Modified Collection from TerraMai redefines exterior wood design—offering thermally modified hardwood and softwood products that are dimensionally stable, durable, and stunning. From precision-milled Siding to architecturally striking Slat Panels, the Modified Collection gives you the freedom to design without compromise.
Available in our Unified Color System.
MODULAR PANELS \ SQUARE
Preassembled panels with clean geometry and consistent spacing. Made from modified wood for lasting durability and a modern, structured look. Available in Square or Rounded Edge.
1-3/4” (44 mm) thick x 22” (559 mm) face x 8’ (2,438 mm) fixed lengths. 1-1/4” square slats spaced 3/4” apart on black-stained, exterior-grade plywood.
Softwood
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Modified Softwood Square Slat Exterior Modular Panel – Clear Protect
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Modified Softwood Square Slat Exterior Modular Panel – Ko’Walnut
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Modified Softwood Square Slat Exterior Modular Panel – Morchella
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Modified Softwood Square Slat Exterior Modular Panel – Seaside
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Modified Softwood Square Slat Exterior Modular Panel – Shiro
Hardwood
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Modified Hardwood Square Slat Exterior Modular Panel – Clear Protect
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Modified Hardwood Square Slat Exterior Modular Panel – Ko’Walnut
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Modified Hardwood Square Slat Exterior Modular Panel – Morchella
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Modified Hardwood Square Slat Exterior Modular Panel – Seaside
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Modified Hardwood Square Slat Exterior Modular Panel – Shiro
MODULAR PANELS \ LINEAR
Preassembled panels with clean geometry and consistent spacing. Made from thermally modified wood for lasting durability and a modern, structured look. Available in Square or Rounded Edge.
1-1/4” (32 mm) thick x 22” (559 mm) face x 8’ (2,438 mm) fixed lengths. 1-1/4” x 3/4” slats spaced 3/4” apart on black-stained, exterior-grade plywood.
Softwood
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Modified Softwood Linear Slat Exterior Modular Panel – Clear Protect
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Modified Softwood Linear Slat Exterior Modular Panel – Ko’Walnut
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Modified Softwood Linear Slat Exterior Modular Panel – Morchella
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Modified Softwood Linear Slat Exterior Modular Panel – Seaside
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Modified Softwood Linear Slat Exterior Modular Panel – Shiro
Hardwood
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Modified Hardwood Linear Slat Exterior Modular Panel – Clear Protect
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Modified Hardwood Linear Slat Exterior Modular Panel – Ko’Walnut
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Modified Hardwood Linear Slat Exterior Modular Panel – Morchella
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Modified Hardwood Linear Slat Exterior Modular Panel – Seaside
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Modified Hardwood Linear Slat Exterior Modular Panel – Shiro
OPEN PANELS
Unbacked slats for open-air applications and visual transparency. Modified for durability and dimensionally stable across climates—ideal for screens, facades, partitions, and shading elements. Available in Square or Rounded Edge.
2-1/8” (54 mm) thick x 16” (406 mm) face x 7’ 11-7/8” (2,435 mm) fixed lengths. 1-1/4” square slats with 1/4” roundover edges, spaced 3/4” apart, mounted to matching wood back slats.
Softwood
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Modified Softwood Square Slat Exterior Open Panel – Clear Protect
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Modified Softwood Square Slat Exterior Open Panel – Ko’Walnut
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Modified Softwood Square Slat Exterior Open Panel – Morchella
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Modified Softwood Square Slat Exterior Open Panel – Seaside
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Modified Softwood Square Slat Exterior Open Panel – Shiro
Hardwood
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Modified Hardwood Square Slat Exterior Open Panel – Clear Protect
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Modified Hardwood Square Slat Exterior Open Panel – Ko’Walnut
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Modified Hardwood Square Slat Exterior Open Panel – Morchella
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Modified Hardwood Square Slat Exterior Open Panel – Seaside
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Modified Hardwood Square Slat Exterior Open Panel – Shiro
Our Modified Collection is processed using heat – not chemicals – to transform the structure of the wood. This innovation builds on practices that have been around for centuries.
Today’s thermal modification process takes those traditional principles and refines them – using carefully controlled temperatures and steam to ensure consistent, reliable performance across every board.
Our Modified Collection is an ideal choice for exterior applications where natural beauty, long-term performance, and environmental responsibility all matter. When paired with our sourcing and finishing processes, the result is a product that’s as resilient as it is refined.
SIDING
Softwood
With a band-sawn face, the subtle texture plays with light and shadow, creating warmth and movement.
3/4″ (19 mm) thick x 4-9/16″ (116 mm) face width x 7′ (2,134 mm) to 16′ (4,877 mm) random lengths. Tongue & groove with 1/16″ bevel and eased edges, 3/16″ reveal (1/16″ reveal at base)
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Modified Softwood Siding – Ko’Walnut
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Modified Softwood Siding – Morchella
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Modified Softwood Siding – Seaside
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Modified Softwood Siding – Shiro
Hardwood
A natural face and crisp edges – clean, refined, and ready for sharp, modern forms.
3/4″ (19 mm) thick x 4-3/4″ (121 mm) face width x 7′ (2,134 mm) to 16′ (4,877 mm) random lengths. Tongue & groove with 1/8″ (3mm) reveal and square edge profile
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Modified Hardwood Siding – Ko’Walnut
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Modified Hardwood Siding – Morchella
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Modified Hardwood Siding – Seaside
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Modified Hardwood Siding – Shiro
WORKING ON SOMETHING A LITTLE DIFFERENT?
Whether you’re looking for inspiration or detailed specifications, we’re here to help.
Let’s find the right fit for your project – modified or otherwise.
