Thermally modified ash · for yacht decks
Real wood decks.
Without the teak problem.
Handpicked thermo-ash boards for boatyards and deck builders. Treated with heat and steam only. On your yard in 6–8 weeks.
Why now
Your clients ask where the deck comes from. Have an answer.
Good teak is hard to get legally and harder to trace. Plastic decks get hot and feel wrong on a real yacht. Thermo-ash is real wood, with a clear origin.
2021
EU and US sanctions closed the legal route for Myanmar teak.
Dec 2026
The EU Deforestation Regulation starts. Every timber batch needs a traceable origin.
~€2,200/m²
A new teak deck from a yard, laid. Thermo-ash boards cost a fraction of that.
0 chemicals
Only heat and steam change the wood. Nothing is impregnated or glued in.
The boards
Every board picked by hand. For a deck, not a terrace.
Most thermowood is made for gardens. We sort every board for marine use: straight vertical grain, no knots, no defects. Then it goes into the kiln.
- Species
- American white ash, thermally modified in Estonia
- Grade
- Prime, handpicked. Vertical grain, knot-free
- Size
- 26 × 150 × 3,000 mm raw · planed to 20 mm on request
- Treatment
- Kiln drying, then heat (215 °C) and steam. No chemicals
- Durability
- Class 1 (CEN/TS 15083-1), same class as teak
- Density
- 620–689 kg/m³ · moisture 8 ± 2%
- Fire
- D-s1, d0 (EN 14915)
- Batch
- From 1 m³ of raw wood, about 25 m² of deck
On deck
Works and looks like a wood deck should.
Stable
Heat treatment takes out what makes wood swell and shrink. Fewer gaps, less movement through the seasons.
Real wood underfoot
Natural grain, no plastic. Like any dark deck it warms up in strong sun, so try a sample on your own deck first.
Dark, even colour
The treatment turns ash a deep brown all the way through. Left in the sun it weathers to silver-grey, like teak.
Yard-friendly
Cuts, planes and sands like hardwood. We send adhesive and caulking notes with every order.
How we work
From sample to pallet in four steps.
50% on order, 50% before transport. Freight quoted separately, to any yard in Europe.
- 01
Free sample kit
Boards in your hand. Cut them, glue them, leave them out for the winter.
- 02
Quote in 48 hours
Send the deck area or drawings. You get a clear price per m².
- 03
Your batch
We pick the boards, dry and treat them as one batch. Same colour across the whole deck.
- 04
On your yard
Packed on pallets with a batch document: origin and treatment. 6–8 weeks from order.
Visualisations: foredeck and sun deck in thermo-ash.
About us
Started by seafarers who looked after teak decks for years.
We know what a deck goes through: salt, sun, guests, wash-downs every morning. We started Thermowood Decking to give yards a real wood option we would put on our own vessels.
Siim Kasterpalu
Master Mariner. 14 years on large yachts, most recently First Officer on a 147 m yacht.
Kaarel Kruusmägi
Expedition yacht captain. Previously superyacht crew.
Samples
Put a board through your own winter.
Tell us where to send it. Free for yards, deck builders and yacht crews. We answer within one working day.
Or write to info@thermowooddecking.com