Redwood Thermowood V Tongue and Groove External Cladding

Our Redwood Thermowood V Tongue and Groove External Cladding is v tongue and groove cladding in Redwood Thermowood, for internal and external use.

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

Boards fix together by inserting the tongue into the groove. Chamfered top and bottom edges give a subtle 'V' shadow line at each joint. They can be fitted horizontally or vertically; fit horizontal boards tongue uppermost so moisture runs off.

The boards are reversible, so either face can be used.

Grades and options

• Character Grade: a mix of grades 1 to 4.
• 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.

End matching available

End matching is a paid option you can choose from the dropdown. The board ends are machined to interlock end to end as well as along the edges, so joints can fall between battens instead of having to land on one. That makes fitting faster, cuts waste because offcuts can be used, and gives a neater finish with no visible butt gaps.

Sizes and pricing

• 142 x 20 mm (visible face 130 mm): Character £32.49 / Character end matched £44.99 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

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.