Western Red Cedar is the best wood for sauna benches. It stays cool to the touch even at 180 degrees, resists moisture with its natural oils, holds its shape through humidity swings, and is low in resin so it will not bleed sticky sap. Other woods can work depending on your budget and looks.
You're building or buying a sauna, and you've done the research on heat protocols, session length, and cardiovascular benefits. But one decision will affect every single session: what wood to sit on.
The wrong wood turns a 20-minute sauna session into an exercise in patience. The right wood makes it disappear. Here's what the material science says.
The short answer
Western Red Cedar is the best wood for sauna benches. It balances heat resistance, moisture handling, surface temperature, and longevity better than any other commercially available option.
But cedar isn't the only choice. Depending on your priorities—budget, appearance, or specific health considerations—there are alternatives worth knowing about.
What makes a wood "good" for sauna benches
Four properties determine whether a wood belongs in a sauna:
Heat conductivity
Wood that conducts heat too quickly will burn your skin when the room hits 180°F. You want a wood that stays cool to the touch even when the air around it is hot. This comes down to density. Low-density woods have more air pockets, which act as insulation between the hot air and your skin.
Moisture resistance
Saunas cycle between dry heat and steam. Wood that absorbs moisture will warp, crack, and grow mold. The best sauna woods contain natural oils and resins that repel water.
Dimensional stability
Wood expands and contracts with temperature and humidity changes. The best sauna woods move predictably and minimally, so your bench stays flat and the joints stay tight.
Resin content
Some woods bleed sticky sap when heated. You do not want sticky sap on your towel or your skin. Low-resin woods are non-negotiable for sauna interiors.
The contenders
Western Red Cedar (the standard)
This is the wood most commercial saunas use, and for good reason. Western Red Cedar has a Janka hardness rating of around 350—low on the scale, which is good here. That low density means it stays cooler than harder woods like oak or maple.
Cedar contains natural oils called thujaplicins that resist moisture and decay. These are the same compounds that give cedar its distinctive smell. The aroma fades over months of use, but the moisture resistance stays.
The downsides: Cedar is soft. It dents and scratches more easily than harder woods. And good-quality cedar has gotten expensive. A full set of cedar benches for a standard 6x8 sauna runs roughly $400 to $800 in material costs as of early 2026.
Nordic Spruce (the traditional option)
Finnish saunas traditionally used Nordic Spruce, and Finns have been doing this longer than anyone. Spruce is light, low-density, and stays cool. It's also significantly cheaper than cedar—roughly half the cost.
The catch: Spruce has almost no natural moisture resistance. It needs to be kiln-dried and then maintained with regular cleaning and drying between sessions. In a home sauna that gets used daily, spruce benches can develop surface checking—small cracks—within a year. In a well-ventilated sauna used a few times per week, they can last five to seven years.
Spruce also lacks the aromatic compounds that give cedar its reputation. Some people prefer this. They want their sauna to smell like hot wood, not like a cedar closet.
Hemlock (the budget compromise)
Hemlock sits between cedar and spruce in performance. It has better moisture resistance than spruce but less than cedar. It's harder than cedar, which means it's more durable against scratches but slightly warmer to the touch.
The price is attractive. Hemlock runs about 30 percent less than cedar. The trade-off is appearance. Hemlock has a more pronounced grain pattern and can develop a yellowish tint over time. Some people like the look. Others find it distracting.
Alder (the premium alternative)
Alder is harder than cedar but still low-density enough to stay cool. It has a tight, straight grain and takes a smooth finish well. The color is lighter than cedar—almost blonde when new—and darkens gradually with heat exposure.
The problem with alder is availability. Most of the commercial supply comes from the Pacific Northwest, and it's not always stocked in the dimensions needed for sauna benches. When you can find it, expect to pay 20 to 30 percent more than cedar.
Aspen (the hypoallergenic choice)
Aspen is the wood to use if you or anyone using the sauna has respiratory sensitivities. It has almost no odor—none of the aromatic compounds that give cedar and pine their smell. It's also naturally resistant to bacterial growth.
The downsides: Aspen is soft. Softer than cedar. It dents easily and shows wear faster than any other option on this list. It also has poor moisture resistance and requires meticulous drying between sessions. Aspen benches in a high-use sauna may need replacement every three to four years.
One wood to avoid at all costs
Pine. Especially southern yellow pine. It's cheap, it's everywhere, and it is the wrong choice for sauna benches. Pine bleeds resin when heated. That resin gets on your skin, your towel, and the wood itself, creating a sticky mess that's difficult to clean. The resin can also cause skin irritation in some people. Pine also has poor dimensional stability and will warp noticeably within months in a sauna environment.
Some manufacturers use pine for sauna frames and exterior structures, where it's not exposed to direct heat and skin contact. That's fine. Just don't sit on it.
What about treated or finished wood?
Never use pressure-treated wood inside a sauna. The chemicals used in pressure treatment—typically copper-based compounds—can volatilize at sauna temperatures and enter the air you're breathing.
The same goes for any wood with a factory-applied finish. Varnishes, polyurethanes, and paints will degrade at sauna temperatures and release VOCs into the air. If you're building your own benches and want to protect the wood, use a food-grade mineral oil or a specific sauna wax. Apply it before the wood goes into the sauna, and let it cure for at least 48 hours at room temperature before the first heat cycle.
Practical recommendations
If you're buying a pre-built sauna, ask what wood they use for the benches. Many manufacturers use cedar for the frame and a lower-cost wood for the benches. That's a red flag. The benches are what you touch. They should be the highest-quality wood in the room.
If you're building your own benches, here's your decision tree:
- Budget is the primary concern: Nordic Spruce. Accept that you'll replace the benches in five to seven years.
- Best all-around value: Western Red Cedar. It costs more upfront but lasts 15 to 20 years with proper care.
- You want something different: Alder or Aspen. Alder if you want durability. Aspen if you want no smell.
- You're in a dry climate: Any of the above will work, but cedar and alder will require less maintenance.
- You're in a humid climate: Cedar, and only cedar. The moisture resistance matters more when the air outside the sauna is already damp.
A note on comfort
The wood matters, but so does the bench design. A 2x4 laid flat creates a hot surface because the full width of the wood contacts your skin. A 2x4 on its edge creates a narrow seating surface that digs into your legs. The sweet spot is a 2x6 or wider board, with rounded edges, spaced with a 1/4-inch gap between boards for airflow and drainage.
Some sauna builders use a two-tier bench system where the upper bench is wider at 24 inches and the lower bench is narrower at 18 inches. This lets you choose your heat level and your seating position. The upper bench is hotter. The lower bench is cooler. Both should be the same wood.
Western Red Cedar is the wood that checks every box: cool to the touch, moisture-resistant, dimensionally stable, and durable enough to last a decade or more. It's not cheap, but neither is building a sauna. The benches are where your body meets the room. Skimping here is like putting cheap tires on a car you plan to drive at high speed.
If you're still deciding, find a local sauna supplier or a custom wood shop and ask to see samples. Touch them. Sit on them.
Frequently asked questions
Why is cedar recommended for sauna benches?
Cedar hits all four marks that make a wood right for a sauna bench. Its low density keeps the surface cool to the touch even when the air hits 180 degrees, its natural oils and resins repel water so it resists warping and mold, it stays dimensionally stable through heat and humidity cycles, and it is low in resin so it will not leave sticky sap on your skin or towel.
What makes a wood bad for a sauna bench?
High-density woods conduct heat too quickly and can burn your skin when the room is hot. Woods that absorb moisture will warp, crack, and grow mold over the cycles of dry heat and steam. And high-resin woods bleed sticky sap when heated, which is why low-resin species are the safer pick for anything you sit on.
Does the bench wood really affect the sauna experience?
Yes, more than most people expect. The wrong wood gets hot enough to make a 20-minute session an exercise in patience, while the right wood stays comfortable and lets you forget the surface entirely. Since the bench is the one thing you are in contact with the whole time, its heat handling shapes every session.