Sauna Stones: what types of rocks are best? – BZB Cabins (2024)

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Sauna Stones: what types of rocks are best? – BZB Cabins (1)

Like the kitchen is the heart of the home, the heater is the heart of the sauna, and the stones determine the quality of heat and steam.

The size, density, heat resistance, and chemical composition of sauna rocks play a major role in a good sauna experience.

A good sauna rock has three main characteristics:

  • It must efficiently accumulate and retain heat
  • It must be heat resistant so that it won’t crumble
  • It must not contain sulfur minerals; otherwise, the steam may become toxic

The best way to recognize sulfur-containing stone is the rusty look on the rock surface, so make sure you don’t use them in your sauna. Not only do they produce toxic heat, but they can also darken the wood and metal parts of the sauna.

How to determine a good sauna rock?

A straightforward way to determine a good sauna stone is the color. Darker rocks are usually better suited because they accumulate heat more efficiently.

A stone made up of only one dark mineral will hold up best on the heater. This type of stone is usually heavy and completely black. An exception is a pure white flint, which is suitable as a material for stove stones.

Another characteristic to look for is density and porosity. A good sauna stone is dense, heavy, and non-porous. It should not have flaws, holes, or pores to keep water from entering.

What types of rocks are best suited for my sauna?

Dark igneous rocks such as vulcanite, gabbro, peridotite, basalt, and granite are excellent choices. Mixed type such as the gabbro-diabase is also very common and found in nature. Vulcanite is good for its high metal content, which helps it store heat very efficiently.

Artificially made ceramic stones can also be very good, but they are much more expensive.

There are many choices available and each has a different strong point so it’s impossible to pick just one, so I suggest experimenting a bit to find out what works best for you.

You can also mix different types of stones and create your own unique sauna experience this way.

Rock types to avoid

Avoid sedimentary and metamorphic rocks like sandstone, quartzite, slate as they’re too soft and can easily pop when heated up because they have falts or moisture trapped inside.

Generally, I would avoid light-colored rocks because they tend to crumble more quickly. However, there are exceptions to the rule, such as artificially made (ceramic) stones or those made of pure white flint. Definitely avoid rusty-looking rocks when sourcing from nature as these contain sulfur content and can create toxic steam.

How often should sauna stones be replaced?

It is necessary to replace the stones periodically, as they tend to crumble and lose their properties over time. If your sauna starts to heat up more slowly, it’s time to re-stack your stones.

I would suggest replacing the stones at least once a year, or after about 300 hours of usage.

Before you you do so, make sure to wash the stones and stack them up in such a way that there are sufficient air gaps in between the stones. This will allow the hot air to circulate more efficiently in the heater.

To allow hot air to accumulate better in the stones, it is best to stack smaller stones more densely on top of the heater.

Harden your stones before the first use!

Harden your stones in order to make them last longer.

It’s a very simple process. Just heat them up to the normal operating temperature or a bit higher, and let them cool down naturally. The important part is to not throw water on the stones during hardening. That’s it!

Final words

Choosing the right sauna stones is a lot of fun experimenting and the final choice is highly subjective. You can’t go wrong with darker rocks made of gabbro, basalt, or peridotite, but don’t hesitate to try out different types and find yours!

Stay safe when experimenting in your sauna!

If you’ve been dreaming about getting your very own sauna, take a look at our outdoor sauna kits and let us know if you need any help choosing the right size and type.

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Sauna Stones: what types of rocks are best? – BZB Cabins (2024)

FAQs

Sauna Stones: what types of rocks are best? – BZB Cabins? ›

Dark igneous rocks such as vulcanite, gabbro, peridotite, basalt, and granite are excellent choices. Mixed type such as the gabbro-diabase is also very common and found in nature. Vulcanite is good for its high metal content, which helps it store heat very efficiently.

What type of rock is best for a sauna? ›

Basalt – This is a dense, heavy rock that heats up quickly and retains heat well. It is commonly used in saunas because of its ability to withstand high temperatures. Granite – This durable rock is resistant to cracking and is a popular choice for saunas due to its ability to maintain heat.

What kind of rock holds heat best? ›

1. Basalt: Dark and volcanic. Originating from volcanic rock, certain types of basalt stones are favoured in saunas for their superior heat retention and distribution. Found globally in regions with volcanic activity, these dark-hued stones, typically black or dark gray, absorb and store heat effectively.

How to select sauna stones? ›

Your sauna stones should be strong and sturdy, especially when subjected to high heat, so there are quite simple ways to test this. Firstly, try scratching them with a nail. If material comes off then they are not safe. Next, drop them to a hard ground and inspect them to ensure they remain unchipped.

What are the best stones for sweat lodges? ›

The best type of stones for a sweat are igneous. Above all, do NOT use sedimentary stones that come from a wet area, as they will explode when heated. In our area, we collect quartzite and basalt cobbles from the sea shore, which are perfect for the task.

How long do sauna stones last? ›

All stones will break down over time, which is why we recommend you maintain your sauna stones at least once a year, and more often if you notice stone residue or small pieces of stones on the floor beneath your sauna heater.

What stone holds heat the longest? ›

Soapstone does not burn or melt at wood-burning temperatures, and it has the ability to absorb heat, hold heat, and radiate heat.

What rock retains heat the longest? ›

  • What material holds heat the longest?
  • Zeolite thermal storage retains heat indefinitely, absorbs four times more heat than water.
  • What stone retains heat the best?
  • Natural stones with high energy density and excellent thermal conductivity are soapstone (by far the best) and marble.
Dec 29, 2018

What rock gives heat and pressure? ›

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

Do you pour water over sauna rocks? ›

Water should be thrown on the sauna heater rocks with the use of a ladle so that the right amount of water is applied. Once the water hits the rocks, it turns to steam. You should not pour too much water onto the heater. But if you can provide a drain, it may be more convenient for cleaning purposes.

How often should I replace sauna rocks? ›

In case the sauna is not in use every week, once a year will suffice. Before you check the sauna stones: Make sure to check that the heater is switched off and the stones have fully cooled down before removing the stones. We recommend wearing gloves when unloading old stones from the heater.

How big should sauna rocks be? ›

The Rocks and Your Sauna Heater

The sauna rocks should be about the size of your fist or a large potato. Loosely place the rocks around, between, and on top of the sauna heater's elements.

What stone keeps you safe? ›

Black Tourmaline

According to legend, the stone will keep you safe from harm and make sure that you always act positively. It is incredibly protective and grounding. It supports the user in feeling more anchored and tranquil by clearing and repelling bad energy from the body, the house, and the workplace.

What stone is for inner peace? ›

Whilst there are a variety of crystals used for peace within crystal healing practices, amethyst remains the most popular.

What is the best material to build a sauna? ›

When you build a sauna, choose a softwood that is flexible and not easily damaged by moisture or warped by heat. The most popular choices are cedar saunas.

What is the best material for a sauna? ›

Western Red Cedar is an excellent choice of wood for sauna interiors and benches due to its optimal heat characteristics. Cedar is a stable softwood that is resistant to decay and discoloration in the intense thermal conditions of a sauna.

Can you put a sauna on gravel? ›

If you don't already have an existing cement patio or deck, there are a few different options you can choose for your outdoor sauna foundation. The best choices are concrete, wood, or gravel.

Are you supposed to pour water on the rocks in a sauna? ›

Water should be thrown on the sauna heater rocks with the use of a ladle so that the right amount of water is applied. Once the water hits the rocks, it turns to steam. You should not pour too much water onto the heater. But if you can provide a drain, it may be more convenient for cleaning purposes.

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