What to Put Under an Outdoor Sauna (Proper Installation Tips)

If you’re planning to install an outdoor sauna, you may be wondering what to put underneath it.

Proper installation is crucial for both the safety and longevity of your sauna.

In this article, we’ll provide tips and recommendations for what to put under your outdoor sauna.

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1. Check the manufacturer’s recommendations

Before installing your sauna, it’s important to check the manufacturer’s recommendations.

They may have specific instructions for what to put under your sauna. This could include a certain type of base material or specific dimensions for the foundation.

2. Choose a level location

It’s important to choose a level location for your outdoor sauna. This will ensure that the sauna is stable and safe to use.

If the ground is not level, you may need to create a level base using gravel or concrete.

3. Use a vapor barrier

A vapor barrier is a material that prevents moisture from seeping into the sauna.

This is especially important if you live in a humid climate.

You can use a plastic sheet or vapor barrier paper to create a moisture barrier under your sauna.

4. Use a sturdy base material

The base material you use should be sturdy enough to support the weight of the sauna and its occupants.

Common base materials include concrete, gravel, and compacted soil. Make sure the base material is level and stable.

5. Consider drainage

It’s important to consider drainage when installing your outdoor sauna.

If water is allowed to collect under the sauna, it can cause damage over time. Make sure the base material allows for proper drainage.

6. Use insulation

Insulation is important for maintaining a consistent temperature inside your sauna.

You can use insulation under the sauna to prevent heat loss and keep the sauna warm and comfortable.

7. Add a non-slip surface

The area around your sauna can become slippery when wet, so it’s important to add a non-slip surface.

You can use rubber mats or textured pavers to create a safe surface around your sauna.

8. Consider aesthetics

While function is important, you may also want to consider aesthetics when choosing what to put under your outdoor sauna.

You can use decorative stones, wood chips, or plants to create an attractive base around your sauna.

9. Protect the environment

It’s important to protect the environment when installing your outdoor sauna.

Make sure the materials you use are eco-friendly and won’t harm the surrounding ecosystem.

10. Maintain your sauna base

Once your sauna is installed, it’s important to maintain the base material.

This may include regularly checking for moisture buildup, adding additional insulation, or adding non-slip surfaces as needed.

In conclusion, proper installation of an outdoor sauna is crucial for both safety and longevity.

By following these tips and recommendations, you can ensure that your sauna is installed on a stable, safe, and attractive base that will last for years to come.


  1. Can I use grass or natural soil as a base material for my outdoor sauna?

It’s not recommended to use natural soil or grass as a base material for your outdoor sauna, as these materials can shift and settle over time, causing instability.

  1. Do I need to use a vapor barrier if I live in a dry climate?

Even if you live in a dry climate, it’s still recommended to use a vapor barrier under your outdoor sauna to prevent moisture buildup.

  1. How often should I check my sauna base for maintenance?

It’s recommended to check your sauna base for maintenance at least once a year, or more frequently if you notice any issues.

  1. Can I use a pre-made sauna base?

Yes, you can purchase pre-made sauna bases that are specifically designed for outdoor use. These bases are typically made from durable materials like concrete or wood and may include features like insulation and drainage.

  1. Is it necessary to add a non-slip surface around my outdoor sauna?

Yes, it’s important to add a non-slip surface around your outdoor sauna to prevent slips and falls, especially when the surface is wet. This can be achieved using materials like rubber mats or textured pavers.

By following these guidelines, you can ensure that your outdoor sauna is installed on a stable and safe base that will provide years of relaxation and enjoyment.

Remember to check the manufacturer’s recommendations, choose a level location, use a vapor barrier, sturdy base material, consider drainage, use insulation, add a non-slip surface, consider aesthetics, protect the environment, and maintain your sauna base.

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