Cedar is the better choice for most home saunas because of its natural resistance to moisture and its calming aroma, while hemlock works well for homeowners who want a neutral scent, a more modern look, and a lower price point. Ventilation matters just as much as species selection, since even the most decay-resistant wood breaks down under chronic dampness. The sections below walk through aroma, durability, stability, cost, and maintenance so you can match the right wood to your own routine.
TL;DR:
- Cedar’s decay resistance makes it the best option for outdoor, high-moisture, or traditional sauna setups; proper ventilation is still crucial to prevent wood breakdown.
- Hemlock’s lower cost and neutral aroma suit indoor infrared saunas with lower humidity, but it requires diligent drying and ventilation to avoid moisture damage.
- Proper heartwood content in cedar enhances its durability, while higher shrinkage in hemlock demands careful installation to maintain stability over time.
- For homeowners seeking low-maintenance or temporary solutions, portable infrared blankets or prebuilt outdoor units eliminate wood-related upkeep concerns.
- Ventilation and moisture management are key for both woods’ longevity, with habits like wiping surfaces and airing out after sessions making a measurable difference.
Table of Contents
- How cedar and hemlock compare at a glance
- Hemlock: what it offers and where it falls short
- Cedar: the traditional favorite and why it holds up
- Matching wood properties to your priorities
- A practical checklist before you buy
- Keeping either wood in good shape for years
- When a wood-free option makes more sense
- Sources
- FAQ
How cedar and hemlock compare at a glance
Before getting into the details, it helps to see how these two species stack up against the priorities that matter most to homeowners: scent, upkeep, budget, and where each wood performs best.
- Outdoor or high-moisture builds: Cedar’s natural decay resistance, supported by heartwood extractives documented in USDA research on durable wood species, makes it the steadier long-term choice.
- Scent-sensitive households: Hemlock’s neutral aroma suits people who find strong wood smells overwhelming during a heat session.
- Budget-conscious builds: Hemlock is typically more affordable and widely available under the HEM-FIR lumber grouping, making it a practical option for interior panels and benches.
- Traditional steam saunas: Cedar’s dimensional stability helps it hold up to repeated heat and moisture cycling without warping as quickly.
- Modern, minimalist interiors: Hemlock’s lighter, more uniform grain gives a cleaner, contemporary look that some homeowners prefer over cedar’s reddish tones.
If you already own or are planning an infrared cabin, either wood can work well as long as the ventilation plan matches the moisture load. A cold plunge or outdoor sauna set in a damp climate leans the decision more firmly toward cedar, while an indoor, low-humidity infrared unit gives hemlock more room to perform.
Hemlock: what it offers and where it falls short
Western Hemlock is a dependable, workable softwood that many builders use for sauna interiors because it machines cleanly and holds a consistent, pale color.
Western Hemlock is mechanically strong and reasonably dense, with typical hardness, density, and shrinkage figures representative of common softwoods, according to The Wood Database. That shrinkage figure matters in a sauna, where wood repeatedly heats and cools. Hemlock tends to experience slightly more dimensional movement than cedar during heat and moisture cycles, so joints and panel seams may require more attention during installation and maintenance.
Hemlock’s biggest practical advantages show up in two places: scent and price.
- Low aroma: Hemlock carries a mild, neutral smell, which appeals to people who find cedar’s fragrance too strong during longer sessions.
- Lower decay resistance: Hemlock lacks the natural extractives that protect cedar, so it depends more heavily on proper drying and ventilation to avoid moisture damage.
- Moderate cost: Hemlock is commonly sold under the commercial HEM-FIR grouping and tends to run less expensive than cedar in most North American lumber markets.
- Common uses: Interior wall panels, benches, and infrared cabin interiors where moisture exposure is lower than in a traditional steam room.
Because hemlock does not have cedar’s built-in resistance to decay, maintenance becomes the deciding factor in how long it lasts. Wiping down surfaces after each session, keeping the room ventilated between uses, and avoiding standing water on benches all extend hemlock’s working life. Homeowners who choose hemlock for its scent and price should treat drying and airflow as a daily habit rather than an occasional chore.
Cedar: the traditional favorite and why it holds up
Western Red Cedar remains the most recommended species for sauna interiors, and the reasons come down to two measurable traits: stability and natural decay resistance.
Western Red Cedar’s heartwood extractives show measurable antifungal activity in lab assays, giving it a documented edge in decay resistance over many other softwoods, according to USDA research. That resistance is not unlimited. The same research notes that durability depends on sourcing enough heartwood and protecting the wood from chronic wetting, since those protective extractives can leach away with prolonged exposure to water.
Cedar’s other defining trait is its dimensional stability, which keeps boards from warping or cupping as dramatically as other species when exposed to repeated heat and humidity swings. That stability is often cited as the single trait that matters most for sauna construction, since rapid thermal cycling demands wood that moves as little as possible.
- Aromatic heartwood: Cedar’s natural oils create the warm scent many people associate with sauna use, though scent-sensitive individuals may find it strong at first.
- Strong moisture tolerance: Cedar handles humid, high-heat conditions better than most softwoods, making it well suited to both walls and benches.
- Premium pricing: Cedar typically costs more than hemlock, reflecting its durability and demand for sauna-grade heartwood lumber.
- Best applications: Full interior builds, benches in high-moisture traditional saunas, and outdoor-facing surfaces exposed to weather.
The price premium tends to pay off in builds where moisture exposure is frequent, such as traditional steam saunas or outdoor units used year-round. For drier infrared setups with light use, the gap between cedar and hemlock narrows considerably.
Matching wood properties to your priorities
Durability, stability, aroma, heat feel, and cost rarely point in the same direction, so it helps to weigh them one at a time.
Durability comes down to heartwood content. The USDA’s covered bridge research found that naturally durable species depend on having enough heartwood, since sapwood lacks the same protective extractives. A cedar board cut mostly from sapwood will not perform the way species data suggests, which is why asking your supplier about heartwood percentage matters more than the species name alone.
Dimensional stability separates the two species clearly. Cedar’s volumetric shrinkage is at the lower end of the typical range for common softwoods, which means it tends to have better dimensional stability with fewer gaps, less cupping, and tighter joints over years of heat cycling, according to The Wood Database. Hemlock’s higher shrinkage figure makes small seasonal movement more likely, which is manageable with proper installation but worth planning for.
- Aroma and air quality: Cedar’s oils create a stronger scent that some people enjoy and others find overpowering; hemlock’s neutral profile suits sensitive noses.
- Thermal feel: Both species warm evenly, though cedar’s tighter grain tends to hold a steadier surface temperature during longer sessions.
- Cost and grades: Clear, knot-free cedar commands the highest price, while standard-grade hemlock offers a practical middle ground for budget builds.
For anyone sensitive to strong scents or VOCs from wood oils, ventilating the space well between sessions reduces lingering aroma regardless of species.
A practical checklist before you buy
Choosing between cedar and hemlock gets easier once you know what questions to ask and what to watch for.
- Define intended use first. Decide whether the space is for an outdoor sauna, an indoor infrared cabin, or a traditional steam build, since moisture exposure varies widely across these.
- Separate bench wood from wall wood. Benches endure more direct moisture and skin contact, so prioritize decay resistance there even if walls use a more affordable species.
- Account for scent sensitivity. If anyone in the household reacts to strong wood aromas, hemlock or a well-ventilated cedar build are both reasonable paths.
- Set a realistic budget. Cedar’s premium is easiest to justify in high-use or outdoor settings; hemlock often makes more sense for occasional, indoor use.
- Ask your supplier the right questions. Request heartwood percentage, kiln-dry status, grading standard, and a recommended ventilation spec for the finished space.
Watch for red flags during sourcing: high sapwood content, vague or unspecified lumber origin, and a supplier who cannot speak to ventilation requirements for the finished structure. Any of these should prompt more questions before you commit.
Pro Tip: Most installers avoid oils, stains, or paint inside the sauna chamber, since sealed finishes trap moisture against the wood instead of letting it escape, which works against both cedar’s and hemlock’s natural resistance.
Keeping either wood in good shape for years
The single biggest factor in how long cedar or hemlock lasts is not the species itself but how well the space manages moisture. The Department of Energy’s ventilation guidance summarizes this with a simple principle: seal tight, ventilate right. Applied to a sauna, that means a well-sealed structure paired with deliberate airflow after each session, rather than relying on the wood alone to resist decay.
A few habits make a measurable difference over time.
- Air out the space after every session to let trapped humidity escape before it settles into the wood grain.
- Wipe down benches and walls where sweat or condensation collects, especially in traditional steam saunas.
- Inspect joints and corners periodically for discoloration or softness, which often signal moisture buildup before visible damage appears.
- Expect more frequent attention in steam saunas than in infrared cabins, since infrared units generate less ambient humidity and put less stress on the wood.
| Maintenance task | Cedar | Hemlock |
|---|---|---|
| Post-session airing | Reduces aroma buildup and moisture | Prevents decay since natural resistance is lower |
| Surface wiping | Protects heartwood extractives from leaching | Protects against surface staining and softening |
| Inspection frequency | Lower, due to natural decay resistance | Higher, due to lower natural decay resistance |
For more on how sauna type affects humidity and wood stress, Tranquilora’s comparison of home sauna types walks through how infrared and traditional units differ in moisture output and upkeep demands.
When a wood-free option makes more sense
Not every homeowner wants to manage lumber grades, ventilation specs, and seasonal wood movement, and that is a reasonable position. A few product paths sidestep the wood question entirely while still delivering a heat session at home.
- A portable infrared sauna blanket suits anyone who wants a heat session without any wood maintenance, ventilation planning, or installation at all.
- A foldable sauna tent works well for small spaces or renters, since it stores away between uses and needs no moisture management.
- The Eldvik 2-Person Outdoor Infrared Sauna gives homeowners who want a built, outdoor-ready unit a prebuilt option, so the construction and wood-grade decisions are already handled.
These paths trade the character of a custom wood build for simpler upkeep. A blanket or tent needs no sealing, sanding, or ventilation planning at all, while a prebuilt outdoor unit like Eldvik removes the sourcing and grading questions covered earlier in this guide. For homeowners weighing a full wood build against something lower-maintenance, Tranquilora’s infrared sauna collection and portable sauna collection are both reasonable starting points to compare options side by side.
Sources
- Western Hemlock | The Wood Database (Softwood)
- Western Red Cedar | The Wood Database (Softwood)
- Evaluating Naturally Durable Wood Species for Repair and Rehabilitation of Above-Ground Components of Covered Bridges
- Guide to Home Ventilation (U.S. DOE / Building guidance)
FAQ
Is hemlock or cedar better for a sauna?
Cedar is generally the better choice for moisture-heavy builds like traditional steam saunas or outdoor units, thanks to its natural decay resistance and stability. Hemlock works well for drier, indoor infrared setups where budget and a neutral scent matter more than long-term moisture exposure.
What sauna does Joe Rogan use?
Tranquilora does not have publicly listed information on specific individuals’ personal sauna equipment. Choosing a wood or sauna type is best based on your own moisture exposure, scent preference, and budget rather than any one person’s setup.
Is hemlock wood ok for a sauna?
Yes, hemlock is a common and workable choice for sauna interiors, particularly benches and panels in infrared cabins with lower humidity. It lacks cedar’s natural decay resistance, so consistent ventilation and drying between sessions matter more with hemlock than with cedar.
What is the healthiest wood for a sauna?
No wood species is classified as healthier than another in a medical sense, and Tranquilora does not make health claims about sauna materials. The more relevant factor is choosing a species with low aromatic VOC sensitivity for your household, such as hemlock’s neutral scent, paired with good ventilation.
Recommended
- How to Choose the Best Home Sauna in 2026 | Complete Buying Guide
- Home Sauna Types Compared for Everyday Use
- At Home Sauna Buying Guide for Your Routine
- Infrared Sauna Buying Guide for Your Home
This article is for general informational and educational purposes only and is not medical advice. Consult a qualified healthcare professional regarding health conditions or before making significant changes to your wellness routine.