The Best Sauna Timber and Materials for Sydney's Climate

Timber is the defining material of any sauna — it shapes the aesthetic, the feel, and the longevity of your investment. But not all timbers perform equally, and in Sydney's coastal climate, material selection is especially important.

Here's what you need to know about choosing the right sauna timber for your Sydney home.

Why Timber Choice Matters in Sydney

Sydney's climate presents specific challenges for sauna materials:

• Coastal humidity — salt air and moisture accelerate degradation in poorly suited timbers
• UV exposure — intense Australian sun can bleach and dry out exterior timbers
• Temperature cycling — the expansion and contraction of timber through Sydney's warm summers and mild winters requires dimensionally stable species

Western Red Cedar: The Gold Standard

Western Red Cedar is the most widely used sauna timber in the world — and for good reason. Its natural oils make it inherently resistant to moisture, decay, and insects. It's dimensionally stable, meaning it handles the heat and humidity cycles of sauna use exceptionally well.

Why it works in Sydney:

• Natural moisture resistance suits coastal conditions
• Aromatic oils create the classic sauna scent
• Beautiful reddish-brown tone that weathers gracefully outdoors
• Lightweight and easy to work with for custom joinery

Best for: Both indoor and outdoor saunas. Particularly well-suited to Sydney's coastal suburbs.

Hemlock: The Contemporary Choice

Western Hemlock is a pale, fine-grained timber that has become increasingly popular in modern sauna design. It lacks the natural oils of cedar but is an excellent heat conductor and has a clean, minimalist aesthetic that suits contemporary interiors.

Why it works in Sydney:

• Pale, neutral tone complements modern Sydney home aesthetics
• Excellent thermal properties for consistent heat distribution
• Smooth grain is comfortable against skin
• More affordable than cedar without compromising quality

Best for: Indoor saunas with a contemporary or Scandinavian design aesthetic.

Thermally Modified Timber: The Performance Option

Thermally modified timber (TMT) is wood that has been heat-treated at high temperatures to permanently alter its cellular structure. The result is a timber with dramatically improved moisture resistance, dimensional stability, and durability — without the use of chemicals.

Why it works in Sydney:

• Superior resistance to Sydney's coastal humidity and salt air
• Minimal expansion and contraction in outdoor conditions
• Dark, rich tone that suits both modern and natural aesthetics
• Ideal for outdoor sauna cabins exposed to the elements

Best for: Outdoor saunas in coastal Sydney locations — Northern Beaches, Eastern Suburbs, and waterfront properties.

Abachi: The Infrared Sauna Specialist

Abachi (also known as Obeche) is a light African timber commonly used in infrared saunas. It has very low thermal conductivity, meaning it stays cool to the touch even when the sauna is at operating temperature — an important consideration for infrared builds where benches and walls are in close contact with the body.

Best for: Infrared sauna installations where low surface temperature is a priority.

Timber Comparison at a Glance

Interior vs Exterior Timber Considerations

For outdoor saunas, the exterior cladding and interior lining may use different timbers. The exterior needs to withstand UV, rain, and humidity — thermally modified timber or cedar are ideal. The interior prioritises heat performance, comfort, and aesthetics — cedar or hemlock are the preferred choices.

Talk to a Material Specialist

At Crafted Saunas, we guide every client through material selection as part of our design consultation. We'll recommend the right timber for your location, aesthetic, and budget — ensuring your sauna looks beautiful and performs for decades.

Book a material consultation →