What Is the Best Wood for a Sauna?

The best wood for a sauna stays cool to the touch, handles repeated heat and moisture without warping, and gives off little or no resin or scent. Western red cedar, Canadian hemlock, basswood, and aspen lead the field, and the right pick depends on your heat type, your budget, and whether anyone using the room reacts to strong wood aromas.

The short answer

For most home buyers, the best wood for a sauna comes down to four proven species. Western red cedar is the premium all-rounder: it resists rot and mold, stays comfortable to sit on, and carries the classic sauna aroma. Canadian hemlock is the value pick and the most common wood in infrared cabins because it is stable, low in resin, and priced well. Basswood and aspen are the hypoallergenic choices, nearly scent-free and gentle on skin, which makes them a strong fit for anyone with allergies, asthma, or a preference for a neutral room. Thermally modified versions of aspen and spruce add durability for wet or outdoor builds. Any of these species will serve you for years with basic care and good ventilation, so the decision is mostly about scent, feel, and where the sauna will live.

What makes a wood good for a sauna?

A sauna cycles between hot, humid, and dry many times a week, so the wood has to behave under stress that would crack or stain ordinary lumber. Five properties separate a good sauna wood from a poor one.

• Low heat conduction. Softwoods with a low density stay cooler at the surface than dense hardwoods, so benches and backrests do not burn bare skin even when the air is hot.
• Low resin and pitch. Woods that bleed sap when heated can drip, stain, and cause hot spots. The best sauna woods carry little to no resin.
• Dimensional stability. Good sauna wood expands and contracts evenly, so boards resist cupping, checking, and warping through years of heat cycles.
• Moisture and rot resistance. Steam and sweat keep the interior damp. Species with natural durability, or wood that has been thermally modified, shrug off mold and decay far better than untreated softwood.
• Low odor and low emissions. Some people want the cedar smell; others need a scent-free room. Woods low in aromatic oils give off almost nothing at sauna temperatures, which matters for sensitive users.

How the top sauna woods compare

Here is how the four most common home-sauna woods stack up, plus thermally modified wood, which is a treatment rather than a species. Prices are general market ranges and vary by supplier and grade.

Wood	Feel and scent	Heat behavior	Durability	Relative cost	Best for
Western red cedar	Soft, warm, classic aroma	Stays cool to the touch	High: natural rot and mold resistance	Mid to high	Buyers who want aroma and outdoor durability
Canadian hemlock	Smooth, nearly odorless	Stable at lower heat	Moderate: benefits from care and ventilation	Low to mid	Infrared cabins and value builds
Basswood	Very smooth, virtually scent-free	Heats slowly and evenly, cool to sit on	Moderate: keep it dry between sessions	Mid	Scent-sensitive users and bench surfaces
Aspen	Light, clean, no resin or scent	Cool to the touch	Moderate untreated, high when thermally modified	Low to mid	Allergy, asthma, and pediatric use
Thermally modified (thermowood)	Darker tone, low scent	Cool to the touch	Very high: strong rot and moisture resistance	High	Outdoor and high-humidity builds

What is the best wood for a traditional sauna?

A traditional sauna runs hot, often 175 to 195 degrees Fahrenheit, and you pour water on the stones to raise humidity. That combination of high heat and steam rewards a wood with natural moisture resistance. Western red cedar is the long-standing favorite here because its natural oils resist mold and decay while the surface stays cool enough to lean against. According to the USDA Forest Products Laboratory, western red cedar heartwood is rated resistant to very resistant to decay, which is why it holds up so well in a damp room. Nordic spruce and thermally modified woods are also common in hot rooms, especially in Finnish-style builds. If you are weighing a classic hot room, our traditional saunas for sale use these proven woods. If you are choosing between the two most popular species, see our full comparison of hemlock vs cedar for a sauna.

What is the best wood for an infrared sauna?

Infrared saunas run cooler, usually 120 to 150 degrees Fahrenheit, and they stay dry because there is no water on stones. Lower heat and no steam widen your options. Canadian hemlock is the most common choice in infrared cabins because it is stable, low in resin, and affordable, so it keeps the price of a quality cabin down without sacrificing performance. Basswood is the top pick for anyone who wants a scent-free room or has sensitivity to aromatic woods, since it is smooth and virtually odorless. Cedar still works well in infrared units for buyers who want the aroma, and our comparison of basswood vs cedar for an infrared sauna digs into that choice. You can compare cabins across all three woods in our infrared saunas collection.

What is thermally modified wood, and is it worth it?

Thermally modified wood, often sold as thermowood or thermo-aspen, is not a separate species. It is ordinary wood baked at roughly 320 to 465 degrees Fahrenheit in a low-oxygen chamber using only heat and steam, with no chemicals. The process changes the wood so it absorbs less moisture and holds its shape. The USDA Forest Products Laboratory notes that thermal modification improves dimensional stability and moisture resistance, which is exactly what a wet sauna demands. Thermo-aspen is popular because it keeps aspen's cool, scent-free surface while gaining much better durability. The trade-offs are a higher price, a darker color, and a slight loss of strength, so it shines most in outdoor or high-humidity builds where the extra durability earns its cost.

What is the best wood for an outdoor sauna?

An outdoor sauna faces rain, snow, sun, and temperature swings on top of the heat inside, so durability outranks everything else. Western red cedar is the traditional outdoor choice for its natural weather resistance, and thermally modified woods are gaining ground because they resist rot and movement even in constantly wet conditions. Whatever wood you choose, an outdoor build still needs proper roofing, ventilation, and a stable base to last. Our outdoor saunas are built with weather-ready woods that hold up to the elements.

What wood should you avoid in a sauna?

Some woods and materials do not belong in a hot room, and using them can be uncomfortable or unsafe.

• Resinous softwoods with knots. Standard pine and knotty softwoods bleed sap and pitch when heated, which drips and creates hot spots. Clear, resin-free grades are the exception.
• Pressure-treated or chemically treated lumber. These are made for outdoor decks, not enclosed heat, and can release fumes at sauna temperatures. Keep them out of the interior entirely.
• Painted, stained, or sealed wood. Finishes can off-gas or blister in the heat. Sauna interiors are left bare so the wood can breathe.
• Plywood, MDF, and composites. Glue-bonded panels can delaminate and emit fumes when hot, so they are not suited to the interior.
• Dense hardwoods for benches. Woods like oak get very hot to the touch, so they are a poor choice where skin makes contact.

Who should choose which sauna wood?

The best wood for you depends on how you plan to use the room. If you love the traditional sauna smell and want strong outdoor durability, cedar is worth the premium, though you should skip it if anyone using the sauna is sensitive to scent. If you or your family have allergies, asthma, or you are building a room children will use, basswood or aspen give you a clean, nearly odorless space. If you want the best value in an infrared cabin, hemlock delivers stable performance at a lower price. If the sauna lives outdoors or in a humid climate, thermally modified wood or cedar will last the longest. One note on new cedar: expect a strong aroma for the first week or two of use, which then mellows as the wood cures. As an authorized retailer, we ship nationwide with free US shipping, HSA and FSA eligibility on qualifying units, and financing options, so you can pick the wood that fits your home rather than settling for what is in stock locally.

Frequently asked questions

Is cedar or hemlock better for a sauna? Neither is universally better; they suit different goals. Cedar resists moisture naturally, carries the classic aroma, and holds up outdoors, which makes it the premium pick. Hemlock is more affordable, stable, and nearly odorless, which is why it is the most common wood in infrared cabins. Choose cedar for aroma and outdoor durability, and hemlock for value and a scent-neutral room.

Is sauna cedar wood safe, and does it off-gas? Untreated western red cedar is considered safe for sauna use and is prized for its natural durability. It does release its natural aroma, which is strongest when the wood is new and fades over the first weeks of use. People who are sensitive to that scent often choose basswood or aspen instead, since those woods give off almost nothing at sauna temperatures.

Do you need to treat or seal sauna wood? No. Sauna interiors are left bare so the wood can absorb and release moisture and stay breathable. Paints, stains, and sealers can off-gas or blister in the heat. Regular cleaning, good ventilation, and letting the room dry between sessions are all the maintenance most sauna woods need.

Choosing your sauna

The best wood for a sauna is the one that matches your heat type, your climate, and your tolerance for scent, and cedar, hemlock, basswood, aspen, and thermowood all earn their place for different buyers. If you want help matching a wood and cabin to your space, browse our traditional saunas and read our full sauna buying guide, or see why buying from an authorized retailer protects your warranty. Have a specific question about wood or fit? Reach out and our team is glad to help.