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Redwood Thermowood Trim Boards
MODEL RTTB
- A matching finish for our Redwood Thermowood cladding: edges, corners, openings, soffits and fascias
- Thermally modified (Thermo-D) for better stability and durability class 2 above ground
- Chemical free: modified with heat and water only
- Rich golden brown, weathering to a modern dark grey/charcoal
- 44 mm and 88 mm wide, 21 mm thick, in 1.2, 2.4 and 3.6 m lengths
Our Redwood Thermowood Trim Boards are trim boards in Scandinavian redwood, for use as a finish or edging on cladding projects, or as soffits and fascia boards.
About Redwood Thermowood
Redwood, thermally modified to 4–7% moisture content. Rich golden brown, weathering to dark grey/charcoal.
Scandinavian redwood. Thermal modification makes it more stable than standard softwood and gives durability class 2 above ground.
The thermal modification uses only heat and water, so the cladding is chemical free.
Profile and fitting
Fix to suit the cladding they finish. Edge detail: square sawn.
Grades and options
Grade: Character (a mix of grades 1 to 4).
Sizes and pricing
Sold per length. All prices are ex VAT.
- 1200 x 44 x 21 mm: £8.99 each ex VAT
- 2400 x 44 x 21 mm: £17.49 each ex VAT
- 3600 x 44 x 21 mm: £26.99 each ex VAT
- 1200 x 88 x 21 mm: £14.49 each ex VAT
- 2400 x 88 x 21 mm: £26.99 each ex VAT
- 3600 x 88 x 21 mm: £40.49 each ex VAT
Specifications
| Species | Scandinavian redwood |
|---|---|
| Origin | Scandinavian |
| Use | Trim, edging, soffits and fascias for cladding |
| Grade | Character |
| Sizes | 44 x 21 mm and 88 x 21 mm |
| Lengths | 1200, 2400 and 3600 mm |
| Moisture content | 4–7% (after thermal modification) |
| Treatment | Thermally modified (heat and water, chemical free) |
| Finish as supplied | Sawn |
| Edge detail | Square sawn |
| Priced per | length, ex VAT |
Finishing and aftercare
No further treatment is needed. To keep the original colour for longer, use a UV Oil or see our cladding treatments.
Drawings and downloads

Tap the drawing to open it full size.

Tap the drawing to open it full size.
Good to know
- Natural timber varies: expect some differences in colour and grain from board to board and from the photos.
- Thermowood can split, so allow an extra 10% on top of your usual wastage. Knots may remain after planing; they don't affect durability.
- Sizes are nominal and can vary slightly with moisture content.
- Questions? Please contact our Sales Team on 01536 267107.
Customers who bought this product also bought:
Black, White and Grey Painted Kiln Dried Nordic Pine Rebated Featheredge Cladding
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You might also like
- A matching finish for our Redwood Thermowood cladding: edges, corners, openings, soffits and fascias
- Thermally modified (Thermo-D) for better stability and durability class 2 above ground
- Chemical free: modified with heat and water only
- Rich golden brown, weathering to a modern dark grey/charcoal
- 44 mm and 88 mm wide, 21 mm thick, in 1.2, 2.4 and 3.6 m lengths
