Thermally modified soffits and ceilings
Knot-free linear soffits, porch ceilings and interior ceilings in Western Red Cedar, VG Hemlock, Ayous, Ash, Iroko, Pine, Shou Sugi Ban style, Rhino Wood and reclaimed barn wood. Heat-and-steam treated, milled to order.
Thermally modified wood
Long, clean runs overhead, from eaves to living rooms.
Soffits and ceilings sit in the one place you can never reach to refinish, so they need wood that stays flat and keeps its colour. Thermal modification removes the sugars that feed decay and the moisture that makes boards sag, giving long clean lines over eaves, porches and living rooms.
ceilings
Stays flat overhead
Clean linear look
Weather-ready eaves
Fire-retardant option
Why specify thermowood ceilings
Overhead wood that looks the same in ten years
Exterior soffits take heat, humidity and wind-driven rain without ever being touched by a brush. Thermally modified boards resist rot, insects and cupping without chemical preservatives, and are resin-free so nothing bleeds onto the finish below. Every board is milled to the thickness, width and profile the project needs, including tongue-and-groove and open-joint batten faces.
10 species in stock
Cedar, Hemlock, Ayous, Ash, Iroko, Pine, Rhino Wood, barn wood and more.
13 milled profiles
T&G, shiplap, channel and open-joint batten faces.
Fire-retardant option
For WUI eaves, backed by ASTM and ULC test reports.
Milled to order
Thickness, width and profile cut to your spec.
Profiles, species
Thirteen profiles, ten species
Opus, Ventura, Lux, Silva, Ventus, Terra, Fortis, Serensus, Aqua, Luna, Veritas, Solis and Vivus profiles from 9/16 in to 1-5/8 in thick, for exterior eave soffits, porch ceilings and interior ceilings.
Western Red Cedar
Shou Sugi Ban style
Heat and steam only, no chemicals, made in the USA
Thermal modification uses only heat and steam. Our thermowood is sourced from certified renewable forests and milled in the USA; the boards are 100% natural, fully recyclable and can go to bio-energy at end of life.
Knot-free
Thermally modified Ash
Ash gives a pronounced, open grain overhead. Left exposed on a soffit it weathers to silver-grey; oiled, it keeps a warm brown.
Vertical grain
VG Hemlock
Tight, straight vertical grain for crisp parallel lines on modern porch ceilings and commercial canopies. Also available Class A fire-retardant as Aegis Reserve.
Pale and light
Thermally modified Ayous
Lightweight and resin-free, Ayous is easy to fix overhead and gives a calm, pale ceiling that brightens covered outdoor rooms.
Western Red Cedar
Natural oils, warm tones
VG Hemlock
Straight vertical grain
Shou Sugi Ban style
Deep black, soot-free
Rhino Wood
Densified, extremely hard
Species
10
Profiles
13
Use
Soffit, porch, interior
Made in
USA
Standard profiles
Sizes and drawings
Standard board sizes for thermally modified Ash, Ayous, Iroko, Pine, Western Red Cedar, VG Hemlock, Shou Sugi Ban style and Rhino Wood. Every order is milled to the thickness, width and profile the project needs.
| Thickness | Width | Length |
|---|---|---|
| 13/16″ | 3-5/8″, 4-13/16″, 5-9/16″ | 2.6 to 9.8 ft |
| 1″ | 3-5/8″, 4-13/16″, 5-9/16″ | 2.6 to 9.8 ft |
| 1-5/8″ | 3-5/8″, 4-13/16″, 5-9/16″ | 2.6 to 9.8 ft |
A fire-retardant treatment backed by ASTM and ULC test reports is available on request; classification depends on species, profile and application.
Thickness: 1-5/8"
Width: 3-3/4" to 4-3/4"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 1"
Width: 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 1-1/8" to 1-1/4"
Width: 4-5/8" to 4-3/4"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 1"
Width: 3-3/4" to 4-3/4"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Thickness: 9/16" to 13/16"
Width: 3-9/16" to 5-1/2"
Length: 2.6 to 10.2 ft (0.8 to 3.1 m)
Ceiling questions
Common questions
Installation guides for cladding, decking and porch flooring are on our guides page.