Best Wood Types for Building a Sauna

Saunas have grown increasingly popular in recent years as homeowners invest in wellness spaces, backyard retreats, and spa-inspired renovations. Whether you’re building an indoor sauna or an outdoor structure, selecting the right wood is one of the most important decisions you’ll make.

Sauna environments expose wood to high temperatures, humidity, and repeated heating cycles, which means not every lumber type will perform well. Choosing durable, heat-tolerant wood helps ensure your sauna remains safe, comfortable, and long-lasting.

Here are some of the best wood types commonly used for sauna construction and why builders prefer them.

What Makes Wood Suitable for a Sauna?

Before choosing lumber, it helps to understand the characteristics that make wood appropriate for sauna use. The best sauna woods typically have:

• Low resin content so they don’t release sticky sap when heated 
• Good resistance to moisture and humidity 
• Minimal warping or cracking during temperature changes 
• Comfortable surface temperatures so benches and walls remain safe to touch 
• Durability over time in high heat environments 

Wood species that meet these requirements provide a more comfortable sauna experience and require less maintenance.

Cedar: A Top Choice for Sauna Construction

Cedar is widely considered one of the best woods for sauna building.

Why cedar works well in saunas:

• Naturally resistant to moisture and decay 
• Pleasant natural aroma 
• Stable in high temperatures 
• Comfortable to sit against due to low heat conductivity 

Cedar is commonly used for sauna walls, ceilings, benches, and trim. Its durability and natural oils make it well suited for environments with heat and humidity.

Pine: A Budget-Friendly Option

Pine can also be used for certain sauna components, particularly framing or exterior sections of the structure.

Advantages of pine:

• Widely available 
• Cost-effective 
• Easy to work with for construction 

However, because pine contains more resin than cedar or hemlock, it is typically used for structural components or exterior areas rather than interior benches.

Tongue and Groove Boards for Sauna Walls

Many sauna walls and ceilings use tongue and groove wood boards. This type of lumber profile allows boards to fit tightly together, creating a clean appearance and helping maintain heat inside the sauna.

Tongue and groove boards are ideal because they:

• Provide tight seams that prevent heat loss 
• Create a polished, finished look 
• Allow for natural wood expansion during heating cycles 

Wood Types to Avoid in Saunas

Some lumber species are not recommended for sauna construction.

Avoid woods that:

• Produce excessive sap when heated 
• Become extremely hot to the touch 
• Warp easily under humidity and heat 
• Contain strong chemical treatments 

Using the wrong wood can lead to discomfort, damage, or premature replacement.

Indoor vs Outdoor Sauna Lumber Considerations

The type of sauna you build may influence your lumber selection.

Indoor Saunas

Often focus on:

• Comfort and appearance 
• Smooth interior wood surfaces 
• Stable lumber that performs well with repeated heating 

Outdoor Saunas

Require materials that can handle:

• Weather exposure 
• Moisture 
• Temperature fluctuations 

Choosing quality lumber helps ensure both types of structures perform well over time.

Why Quality Lumber Matters

The quality of lumber used in sauna construction affects everything from durability to comfort. Properly graded wood helps reduce issues like:

• Warping 
• Splitting 
• Excessive waste during installation 

Working with a reliable lumber yard ensures you have access to the right wood products for your build.

Empire Real Lumber supplies multiple lumber grades, tongue and groove boards, cedar siding, and other wood materials used in sauna construction and outdoor structures.

Contact Empire Real Lumber

Building a sauna is an investment in relaxation, health, and long-term home value. Choosing the right wood ensures your sauna performs well under heat and humidity while maintaining its appearance for years to come.

Cedar, hemlock, and properly selected lumber products remain among the best materials for sauna construction. With the right design and quality materials, your sauna can become a lasting feature of your home.

Empire Real Lumber provides quality wood products from a trusted lumber yard, supporting projects across the Northeast and Midwest. Contact us today.