Luxury is part of the sauna experience of relaxation

Air Quality & The Science Behind a True Finnish Sauna

In a genuine Finnish sauna, heat is only part of the experience. The defining element is the soft, enveloping steam created when water meets hot stones.

This is known as authentic löyly when you consider more than the heater and timber walls. It requires careful control of air quality, material selection and thermal balance.

Because inside a sauna, your body enters an intensified physiological state.

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What Happens to the Body Inside a Sauna?

Clinical research shows that sauna bathing:

• Increases heart rate and circulation

• Promotes vasodilation (widening of blood vessels)

• Stimulates sweating and thermoregulation

• Encourages deep nasal and oral breathing

• Opens pores across the entire body

Studies from Finnish and cardiovascular research groups have linked regular sauna use with improved cardiovascular health, stress reduction and enhanced recovery when used correctly.

In this state, the body becomes highly receptive to its environment.

You are breathing heated air deeply through your nose and mouth.
Your lungs are exposed to vapour.
Your skin absorbs heat through open pores.

This is precisely why material choice matters.

 

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Why Non-Toxic Materials Are Essential

At temperatures between 80–100°C, materials behave differently than they do at room temperature.

Low-grade adhesives, treated timbers, solvent-based finishes and synthetic sealants can emit volatile organic compounds (VOCs) when heated. While these may meet basic building standards, they are not designed for repeated high-temperature exposure in enclosed environments.

Authentic Finnish sauna tradition avoids this risk by relying on:

• Untreated, natural timber

• Low-chemical construction methods

• Breathable assemblies

• Balanced ventilation

The sauna should feel clean, not chemically sharp. The air should feel soft, not dry or synthetic.

When löyly rises, it should carry warmth — not unwanted emissions.

 

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Designed for Health, Performance & Sustainability

At Building with Frames, we design our saunas to respect both tradition and modern building science.

We prioritise:

• Sustainably sourced structural timber

• Low-VOC and low-toxin construction methods

• Natural or recycled insulation systems

• Minimal steel content (typically under 3%)

• Balanced internal volumes for proper heat circulation

Our goal is simple: create an environment where the body can fully relax into the healing effects of a Sauna or Wellbeing space.

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For more information please email us with some information about your project and we will give you a call.