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Radiata Pine Thermowood Channel Siding Cladding
MODEL RPTCSC
- Prime grade: a clearer alternative to our Character grade Redwood Thermowood
- Thermally modified (Thermo-D) for better stability and durability class 2 above ground
- Chemical free: modified with heat and water only
- Dark brown, weathering to grey/charcoal
- Channel siding profile with a recessed channel between boards
- Optional end matching for quicker fitting and less waste
- 142 x 20 mm boards
Our Radiata Pine Thermowood Channel Siding Cladding is channel siding cladding in Radiata pine Thermowood, for internal and external use.
About Radiata pine Thermowood
Radiata pine, thermally modified to 4–7% moisture content. Dark brown, weathering to grey/charcoal.
New Zealand radiata pine, Prime grade.
The thermal modification uses only heat and water, so the cladding is chemical free.
Profile and fitting
Channel siding boards overlap so that a recessed channel shows between each board, giving strong shadow lines.
Grades and options
- Prime grade (all our radiata is Prime).
- End matching (tongue and groove on the board ends) lets you place joints where they fall rather than on a batten, which speeds up fitting and reduces wastage.
Sizes and pricing
- 142 x 20 mm (visible face 127 mm): Prime £49.99 / Prime end matched £62.49 per m² ex VAT
- Supplied in random lengths between 1200 mm and 3600 mm.
- Set lengths are available for an extra charge using Set lengths (Cladding): surcharge £8.00 per m² ex VAT up to 3500 mm, £12.00 per m² ex VAT above 3500 mm. Add the same number of m² of set lengths as cladding.
Specifications
| Species | Radiata pine |
|---|---|
| Origin | New Zealand |
| Profile | Channel siding |
| Use | Internal and external |
| Grade(s) | Prime |
| Sizes | 142 x 20 mm |
| Lengths | Random 1200–3600 mm (set lengths extra: £8.00 per m² ex VAT up to 3500 mm, £12.00 per m² ex VAT above 3500 mm) |
| Moisture content | 4–7% (after thermal modification) |
| Treatment | Thermally modified (heat and water, chemical free) |
| Finish as supplied | Machined |
| Priced per | m², 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.
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.
- Boards left exposed to changing weather before fitting are likely to cup, warp and split. We suggest fitting between October and April where possible, within 7 to 14 days of delivery.
- Sizes are nominal and can vary slightly with moisture content.
- Not sure? Order up to two cladding samples first.
- Questions? Please contact our Sales Team on 01536 267107.
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- New
- Prime grade: a clearer alternative to our Character grade Redwood Thermowood
- Thermally modified (Thermo-D) for better stability and durability class 2 above ground
- Chemical free: modified with heat and water only
- Dark brown, weathering to grey/charcoal
- Channel siding profile with a recessed channel between boards
- Optional end matching for quicker fitting and less waste
- 142 x 20 mm boards
