Western Red Cedar in Saunas: What the Name Means

What western red cedar means in a sauna listing

When a sauna manufacturer writes western red cedar, they are naming a specific botanical species: Thuja plicata, a conifer that grows along the Pacific coast of North America. The tree is not a true cedar at all. It belongs to the cypress family, Cupressaceae, and the common name stuck through centuries of lumber trade rather than through botany. Makers use the full name, western red cedar, to distinguish this wood from other cedars such as eastern red cedar (Juniperus virginiana) or Spanish cedar (Cedrela odorata), which have different grain, color, and behavior in heat.

The wood has a reddish-brown heartwood that darkens with age and exposure to light, a trait buyers often see in the first year of ownership. The sapwood is pale and nearly white, so a single board can show a strong contrast between the two zones. That contrast is a normal part of the species, not a defect. Manufacturers grade the lumber before assembly, and visible sapwood is often allowed in lower grades, while clear grades restrict it. If you see the phrase western red cedar in a listing, check whether the maker specifies the grade, because the same species can look quite different from one grade to the next.

Western red cedar is a softwood. It is less dense than hardwoods like oak or ash, and it is softer than common sauna alternatives such as hemlock or spruce. That softness contributes to its insulating feel underfoot and on the bench, but it also means the wood dents and scratches more easily than harder species. For a sauna interior, where people sit in towels, lean against walls, and occasionally drop a bucket or ladle, the trade-off is generally acceptable, and the wood's other traits often matter more.

Common grain and texture traits

Western red cedar has a straight grain that is usually quite uniform. It is not a dramatic wood. The grain lines are fine and even, and the texture is somewhat coarse to the touch because of the soft earlywood and harder latewood bands. When the wood is dressed and sanded, it feels smooth but not waxy, and it takes a light sheen from the natural oils in the heartwood.

The color is the most distinctive trait. The heartwood ranges from a light pinkish red to a deep reddish brown, and it can vary between boards in the same batch. Some boards show darker streaks where minerals have accumulated, and others show small knots. The grain can be straight or slightly interlocked, and while the species rarely produces the dramatic figure of a hardwood, it does show a subtle ribbon effect on quarter-sawn surfaces.

The wood has a low resin content compared with pine or spruce. That means it does not exude sticky pitch when the sauna reaches temperature, and it does not have the sharp, piney odor that some softwoods release. The scent of western red cedar is mild, woody, and slightly sweet. Some people find it pleasant, others find it too strong in a small enclosed room. If you are sensitive to aromatic woods, spend some time near a cedar product before committing to a full cabin.

How makers use the name

Some manufacturers use western red cedar as a premium option and charge more for it, while others use it on every interior surface as their standard material. The phrase in a listing does not tell you which parts of the sauna are cedar. A cabin may have cedar benches and backrests, or a cedar ceiling and walls, or cedar only on the interior paneling with hemlock or spruce elsewhere. Read the spec sheet closely to see which components are described as western red cedar and which are called simply cedar or wood.

The word cedar alone is ambiguous. In North American lumber parlance it can refer to several different species, and some makers use it loosely. A listing that says cedar interior with no qualifier may not be western red cedar at all. It could be eastern red cedar, which has a stronger, more pungent odor, or it could be a different softwood with a reddish tint. If the distinction matters to you, ask for the botanical name and the grade, and compare that with the species used for benches, wall panels, ceiling, and door frames.

There is also a distinction between solid wood and engineered panels. A solid western red cedar board is one continuous piece of lumber. An engineered panel has a thin cedar veneer over a plywood or composite core. The two perform differently in a hot, humid room. Solid wood can swell and shrink with moisture changes, while engineered panels are more dimensionally stable but may have adhesive lines near the heat. Check the product description for the construction method, not just the surface name.

Why this wood suits a sauna

Western red cedar is used in saunas mainly because it resists moisture and decay. The heartwood contains natural extractives that deter fungal growth and insect attack, and it does not rot quickly when exposed to the repeated wet-and-dry cycles of a traditional sauna. The wood has a higher resistance to moisture than many other softwoods, which is why it is a traditional choice for outdoor cladding and decking in the Pacific Northwest as well as for interior hot rooms.

The same extractives that help with rot resistance are what give the wood its color and scent. They also mean the wood does not need a chemical finish. Sauna interiors are usually left unfinished, and western red cedar is one of the species that can be used without a sealant because it already handles humidity well. If you choose a different wood, you may need to oil the benches or accept more rapid darkening. Western red cedar is typically installed bare, and it ages to a gray-brown if used outside, while the interior retains a warm reddish tone for years.

The wood is also light and easy to work, which matters to manufacturers. It cuts cleanly, does not dull blades quickly, and holds nails and screws without splitting when predrilled. That convenience is one reason the species appears in many prebuilt sauna kits, from compact barrel cabins to full-size indoor rooms. From the buyer's side, the low density makes the cabin lighter to ship and easier to move into place than a comparable hemlock or hardwood structure.

How to pick for your build

If you are choosing between western red cedar and another wood for a sauna, the decision usually comes down to your priorities. Western red cedar offers a distinctive reddish color, a mild scent, and natural moisture resistance. Hemlock is paler, denser, and less aromatic, and it is often used for benches because it resists splintering and feels harder under the legs. Pine is lighter in color, cheaper, and prone to resin bleed, which is why it is less common for interior surfaces. You can read more on the differences between cedar and hemlock sauna wood and on which sauna wood is best for the full comparison.

For a barrel sauna or an outdoor cabin, western red cedar is a strong choice because the wood handles rain and temperature swings well. The tongue-and-groove panels used in kits are often made of cedar for exactly this reason. For an indoor sauna in a dry basement or a converted bathroom, the moisture resistance is still valuable, but the aesthetic becomes more important. If you want a warm reddish interior, cedar delivers it; if you prefer a bright, pale room, you might choose hemlock or aspen instead, which are both described in other articles on this site.

Look at the grade and the construction details. A clear, knot-free cedar board is more uniform in color and has fewer weak points, but it also costs more. A knotty grade is less expensive and has a more rustic appearance, but the knots can check and open over time as the wood dries and heats. For benches, harder woods are often preferred because they resist dents from heels and bucket edges. Some makers use cedar for the walls and ceiling and a different wood for the benches, which gives you the color you want where you see it most and the durability you need where you sit on it.

Answer first: what to buy

If you are buying a sauna kit or a prebuilt cabin and the listing says western red cedar, the phrase means the primary interior wood is Thuja plicata, a reddish, straight-grained, low-resin softwood that resists moisture and decay. The grain is fine and even, the color varies from pink to deep reddish brown, and the wood darkens with age. It is a premium choice for both indoor and outdoor saunas, especially where you want a warm, aromatic interior that does not need a finish.

Check the spec sheet for the grade, the construction method, and which parts of the cabin are cedar. Solid, clear-grade cedar is the highest quality, while engineered panels and knotty grades are lower tiers. For benches, consider a harder wood like hemlock if you expect heavy use. For walls, ceiling, and cladding, western red cedar is excellent. If the listing simply says cedar without the species name, ask the seller for the botanical name before you buy.

When you know you want cedar, browse the cedar-specific picks on this site to see which models use it: best cedar sauna gear and best red cedar saunas. If you are still deciding between wood types, the best hemlock saunas guide shows the main alternative. And if your decision is about the type of sauna rather than the wood, read sauna for beginners which type to narrow down between traditional, infrared, and steam.

What to pick for your use

Questions

Is western red cedar a true cedar?

No. Western red cedar (Thuja plicata) belongs to the cypress family, Cupressaceae. The common name comes from the lumber trade, not from botany. The same is true of eastern red cedar, which is a juniper.

Does western red cedar darken in a sauna?

Yes. The heartwood darkens with exposure to light and heat, and it also ages to a gray-brown when used outdoors. The interior of a sauna will gradually shift from a pinkish red to a deeper reddish brown over the first year.

Why does my cedar bench feel softer than hemlock?

Western red cedar is a softwood with a lower density than hemlock. It dents and scratches more easily. That is why many manufacturers use hemlock or spruce for benches and relegate cedar to the walls and ceiling.

Can I use western red cedar outdoors for a sauna?

Yes. The wood has natural resistance to moisture and decay, which makes it a traditional choice for outdoor cladding and decking. A western red cedar exterior will weather to a silver-gray unless you apply a finish, and the interior will retain its reddish tone.

What does clear grade or knotty grade mean with cedar?

Clear grade means the boards have few or no knots and an even color. Knotty grade allows knots and more sapwood and costs less. Knots can check and open as the wood dries and heats, so clear grade is usually preferred for benches and visible interiors.

Is the scent of western red cedar strong?

It is mild compared with eastern red cedar or pine. Some people find it pleasant and woody, while others notice it more in a small, enclosed hot room. If you are sensitive to aromatic woods, spend time near a cedar product before buying.