Walk into a Finnish sauna and the first thing your senses register is the wood — its colour, its scent, the way it feels when you sit down. Choosing well isn’t about price tags. It’s about how the bench feels at 80°C and how the room ages over twenty winters.
In Finland, wall panels in saunas have traditionally been spruce — picked, frankly, because it was abundant and affordable. Benches were aspen, because aspen doesn’t get hot to the touch and there was little competing demand for the timber elsewhere. That practical pairing has held up for generations, and modern Finnish builders still default to spruce, pine, alder and aspen for the same reasons our grandparents did.
At iHKA we offer three interior wood options — Finnish spruce, Finnish pine, and Finnish aspen — each milled in Finland from northern softwood. None of them is "better" in absolute terms. They are different answers to the same question: what do you want to feel, smell, and see when you sauna?
Why sauna wood is a real engineering choice
A sauna interior cycles between roughly 70 and 110°C, with humidity that swings from very dry to a wall of steam in a single session. That thermal shock has to be absorbed thousands of times over a sauna’s life. The wood has to do four things at once: stay cool enough to touch, resist warping under the heat-and-moisture cycle, smell pleasant rather than acrid when warmed, and not bleed resin onto bare skin.
That last point is why any sauna wood matters. High-resin softwoods can weep sticky pitch onto a bench at operating temperature — uncomfortable at best, scalding at worst. Treated lumber and varnished wood are categorically off the table because the finishes off-gas under sauna heat. The Finnish standard for interior surfaces has always been raw, untreated, kiln-dried, low-resin softwood. Everything else is a refinement of that principle.
Finnish spruce — the traditional default
Spruce (Picea abies) is the wood most foreigners picture when they imagine a Finnish sauna. Light, almost cream-coloured, with a tight grain and visible knots, it has been the staple of Finnish sauna construction for centuries. It heats quickly, smells gently of forest when the room warms up, and develops a soft golden patina with use.
The trade-off: standard spruce can release small amounts of resin, especially in its first few seasons. With our Finnish spruce, this is minimised by careful kiln-drying and grading, but it remains worth knowing. Spruce is a wonderful choice for cladding the walls and ceiling, where it shows its character and aroma without putting resin in direct skin contact.
Choose spruce if you want
- The most classically "Finnish" look and scent
- A warm, traditional aesthetic with visible character
- The traditional choice for wall and ceiling cladding
Finnish pine — character and warmth
Pine has a slightly darker tone than spruce, more pronounced grain, and a richer aroma when warmed. In Finland it has a long history as a building wood, prized because it grows straight, works easily, and produces a beautifully resonant sauna scent. Pine’s heartwood is naturally durable.
It is also the most aromatic of the three woods we offer. If your idea of the perfect sauna involves the unmistakable scent of warmed northern pine — slightly sweet, deeply forest-like — this is the wood to ask for. Like spruce, it can release a small amount of resin during early use; the same kiln-drying and grading discipline applies.
Choose pine if you want
- The strongest "wood and forest" aroma when the sauna is warm
- A slightly darker, more visually rich interior
- A traditional Finnish wood with character in the grain
Finnish aspen — the bench specialist
Aspen (Populus tremula) is the wood Finns reach for when comfort against bare skin is the priority. It is exceptionally low in resin — aspen belongs to the willow family rather than the pine family, so it doesn’t have the resin channels that cause bleeding and weeping. It has a very low thermal conductivity, which is the technical reason it stays cool to the touch even in a hot sauna.
Aspen is light cream — almost white — with very subtle grain and no significant knots. It has very little aroma of its own, which makes it a popular choice for sensitive bathers, family saunas, and anyone who finds strong wood scents overwhelming in a small heated room. It is also exceptionally clean: aspen resists bacteria and fungi naturally, which is why it shows up so often in public saunas and hotels.
Choose aspen if you want
- The most comfortable benches against bare skin
- A bright, clean, almost minimalist interior
- A near-odourless wood — ideal for allergy-sensitive bathers or families with young children
“The honest truth is that all three work. Finns have been bathing in spruce, pine, and aspen interiors for centuries. The right choice is the one that matches the sauna you actually picture in your head.”
What about cedar?
Western red cedar is the wood most commonly used in North American saunas, and it is genuinely good — naturally rot-resistant, aromatic, beautiful. But cedar is not Finnish. Finland has spruce, pine, and aspen growing within reach of every sawmill; importing cedar to make a "Finnish" sauna would be a contradiction in terms. Our wood comes from Finnish forests, milled by Finnish hands, used the way Finns have used it for generations. That’s not romanticism — it’s just where the supply chain is honest.
How we use the woods at iHKA
Every iHKA sauna is fitted with one of these three Finnish woods throughout the interior — walls, ceiling, and benches in matching timber. We do not mix species in a single build, because the consistent grain and tone is part of what makes a Finnish interior feel calm and considered. The exterior is a separate decision, with its own colour palette and protective finish; the interior choice is purely about how the room feels when you’re in it.
If you’re not sure which wood to choose, the practical answer is to come and feel them. Our showroom in Antwerp has each of the three on display. Five minutes sitting on a real aspen bench tells you more than any photograph can.
