Hemlock vs Pine Sauna Wood: Which Is Better for Your Sauna?

Hemlock vs Pine Sauna Wood: Which Is Better for Your Sauna?

The wood your sauna is made from affects how it looks, how it smells, how it handles heat, and how long it lasts. Hemlock and pine are two of the most common sauna woods, and they're very different materials. Here's what matters when choosing between them.

Canadian Hemlock

Western Canadian hemlock (Tsuga heterophylla) has become one of the most popular sauna woods on the market, especially when heat-treated. It's a softwood, but a relatively dense one for its category.

Hemlock strengths:

• Low resin content: Hemlock produces very little sap or resin, even at high temperatures. This is critical in a sauna - you don't want sticky resin bleeding out of your bench at 190F and getting on your skin.
• Hypoallergenic: Nearly odorless with minimal off-gassing. Great for people sensitive to strong wood scents or those who prefer their sauna to smell like steam, not lumber.
• Heat-treatment compatible: Hemlock responds extremely well to thermal modification (heat-treating at 400F+ in a kiln). Heat-treated hemlock, sometimes called thermo-hemlock, has dramatically improved rot resistance, dimensional stability, and a beautiful dark caramel color.
• Even grain: Tight, straight grain that looks clean and uniform. Takes well to benches and interior paneling.
• Cool to the touch: Low thermal conductivity means hemlock benches and backrests don't burn your skin at high temperatures.

Pine

Pine is widely available, affordable, and has been used in saunas for generations, particularly Nordic pine (Pinus sylvestris) in Scandinavian saunas.

Pine strengths:

• Price: Pine is significantly cheaper than hemlock, making it attractive for budget builds and larger saunas where wood costs add up fast.
• Availability: You can find pine at virtually any lumber yard. For DIY builders, sourcing is effortless.
• Pleasant scent: Fresh pine gives off a warm, woody aroma that many people associate with traditional saunas. In Finland, pine-scented saunas are part of the cultural experience.
• Strength: Pine is a sturdy structural wood. It handles the frame and exterior of a sauna very well.

Pine weaknesses in saunas:

• Resin and sap: This is pine's biggest problem in a sauna environment. The high heat draws resin to the surface, creating sticky spots on benches and walls. Over time, resin can harden into dark patches. You can reduce this by using kiln-dried pine, but it never fully eliminates the issue.
• Knots: Pine has lots of knots, and knots are denser than the surrounding wood. In a sauna, knots get hotter than the surrounding surface and can burn your skin when you sit or lean on them.
• Durability under heat: Untreated pine degrades faster than hemlock under repeated high-heat cycles. The wood can crack, warp, and gray out over time.

Direct Comparison

The Smart Approach: Use Both

Many quality saunas actually use both woods in different roles. Pine works great for structural framing and exterior cladding where you're not making skin contact at high temperatures. Hemlock (especially heat-treated) is ideal for interior benches, backrests, and wall paneling where comfort and resin-free surfaces matter most.

If budget forces a single choice for the entire sauna, hemlock is the stronger pick for overall sauna performance. If you're building on a tight budget and can live with some resin management, kiln-dried knotty pine gets the job done at a lower price point.

The Verdict

Choose hemlock if you:

• Want a clean, resin-free interior
• Are sensitive to strong wood scents
• Want benches that stay comfortable at high temps
• Plan to use the sauna for 15+ years
• Are buying a prefab sauna and want the best interior wood

Choose pine if you:

• Are on a tight budget and building DIY
• Love the look and smell of knotty pine
• Are using it for exterior or structural elements
• Don't mind managing occasional resin spots

SweatDecks Uses Premium Hemlock

Our outdoor saunas and indoor saunas are built with FSC-certified, heat-treated Canadian hemlock for maximum durability and comfort. No sticky resin, no hot spots, no compromises. Browse the collection and see the difference quality wood makes. Free shipping over $5,000, HSA/FSA eligible.