Planning a sauna for occasional private garden use is very different from planning a sauna that will stand at a beach, lake, forest site or tourism location and be used frequently in all weather conditions.
In Ireland, this difference becomes extreme due to constant moisture, wind exposure, salt air along the coast and soft, wet ground conditions. A sauna in this environment must be treated as heavy-duty outdoor equipment, not as a garden feature.
If you are planning a sauna for an exposed location, it is important to understand which constructions are specifically suitable for sea, lake and coastal locations in Ireland.
Why Outdoor Sauna Use Is Different from Garden Sauna Use
A garden sauna is used occasionally, often protected by fences, trees and relatively stable ground. Outdoor rental use places the sauna in open, exposed areas where wind, rain and moisture act on the structure every day.
Frequent heating and cooling cycles combined with wet air create stress on timber, roof surfaces and foundations. What works perfectly well in a private garden can fail quickly in an exposed Irish location.
The Irish Weather Problem Most Saunas Are Not Built For
Many sauna manufacturers design for continental climates with dry winters and stable soil conditions. Ireland presents the opposite combination: wet air, wet ground, wind and salt.
This is what causes untreated timber to swell and shrink repeatedly, roof surfaces to age prematurely and bases to suffer from constant ground moisture. The damage is rarely visible in the first weeks. It becomes obvious after the first autumn and winter.
Why Thermowood Is Not Optional in Coastal and Exposed Locations
Thermally modified wood, commonly known as Thermowood, is far more dimensionally stable than untreated spruce or pine.
In exposed Irish locations this results in significantly reduced movement of the timber, lower maintenance requirements and much better resistance to moisture and fungi. This is also why Nordic timber is used for outdoor saunas made from Baltic winter wood.
Interior Height and Diameter: The 2.2 m Rule
For repeated use by different adults, interior space becomes a functional requirement. Saunas with a diameter below 2.2 m, or cube models with insufficient interior height, prevent adults from sitting upright on the upper bench.
This may be acceptable for occasional private use but becomes uncomfortable very quickly when the sauna is used regularly by groups. You can see examples of correctly proportioned models in our garden sauna range.
Roof Construction and Rain Protection
Roofs without proper covering deteriorate rapidly in Irish weather. A proper shingle roof or equivalent rain protection is essential to prevent water penetration and protect the structural timber underneath.
This is one of the most underestimated details when selecting a sauna for outdoor use in exposed environments.
Heater Choice and Stone Volume Matter
Heaters with a large stone capacity create softer, more even heat and cope better with frequent use. For outdoor and exposed locations, the focus should be on heater durability, stable temperature behaviour and suitability for repeated sessions rather than compact size.
Foundations, Ground Moisture and Wind Stability
Placing a sauna directly on soil, grass or wet ground is a common and serious mistake. Proper planning should include screw pile foundations or a solid concrete base, airflow under the sauna floor and drainage around the perimeter.
In coastal areas, anchoring against wind exposure is equally important. Practical guidance for positioning and setup can be found in our delivery and installation guide.
Practical Considerations Most People Overlook
This type of sauna use is still relatively unfamiliar in Ireland from a technical and infrastructure perspective. From the beginning, the sauna must be installed to a high standard with professional heater installation, correct electrical setup for 6–9 kW loads, stable foundations and safe surroundings.
This is not a decorative garden element. It is outdoor equipment operating in public, exposed environments.
Choosing a Sauna Designed for These Conditions
Most saunas on the market are designed for private gardens with occasional use. Outdoor, exposed and frequent use requires correct timber choice, correct dimensions, proper roof construction, suitable heater selection and careful foundation planning.
You can explore suitable models in our garden sauna collection.
Conclusion
Ireland offers exceptional locations for outdoor sauna experiences, but the environment is demanding on materials and construction. A sauna placed at a beach, lake or exposed outdoor site must be specified very differently from a standard garden sauna.
If you are planning to operate a sauna in this way, further practical guidance can be found on our page for sauna rental business operators.
