Sisu Sauna
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Frequently Asked Questions

Everything customers ask before ordering a sauna or ice bath — customisation, lead times, delivery, technical specs and care. Can't find your answer? Reach out anytime.

Products & Customisation

Are your saunas custom-made or do you sell standard models?

Every sauna is custom-built — we have no fixed, off-the-shelf models. You design yours in our 3D builder, choosing the size, wood, heater, glass and layout and watching it come together in real time. The sizes in our catalogue are just popular starting points you can change completely, and we are always happy to help with the design.

Design yours in 3D →
What wood do you use?

We build in three woods: Thai domestic teak, Canadian red cedar, and Russian pine. Teak is dense and naturally weather-resistant, red cedar is light, aromatic and dimensionally stable, and pine is our most affordable option. You choose the wood in the 3D builder and the price updates as you switch.

Can I have an ice bath as well?

Yes. We build oval ice baths with teak cladding, sized from single-person plunge up to multi-person configurations. Often paired with our saunas for a full hot-cold wellness setup.

See ice baths →

Lead Time & Delivery

How long from order to delivery?

Custom saunas: 35–50 days from confirmed order and deposit received. Imported items and catalogue stock: 14–35 days. Lead time starts once the order is confirmed and payment received.

Do you ship internationally?

Yes. We ship globally via sea freight, palletised or in containers depending on size. We quote FOB or CIF and the buyer handles import duties.

Do you install the sauna or just deliver it?

Within Thailand we offer full installation. For everywhere else we deliver as a kit with an interactive installation manual generated for your exact sauna — not a generic guide — so it matches your specific room and layout. We are available for remote support throughout the build.

Technical

What electrical supply do I need?

Most saunas (3–9 kW heaters) run on a standard single-phase supply; only larger commercial heaters above 9 kW need three-phase. The exact wiring and load for your build is shown in the 3D builder as you design the sauna.

See sauna heaters →
Can the sauna go outdoors?

Yes — our outdoor saunas are built to last outdoors, with proper insulation and weatherproof exterior cladding. We normally fit BlueScope galvanized steel roofing, and on some models you can choose asphalt shingles instead.

How much space do I need around the sauna?

If the sauna is built into an existing room, you need a minimum of 25 mm clearance around it for ventilation. We provide an exact site plan with every order so the footprint and clearances are clear before you build.

What's inside the wall?

Every sauna we ship uses our heavier wall stack: 12 mm interior cladding, 13 mm plywood, 50 mm rockwool insulation, a vapour barrier, 13 mm plywood, then 12 mm exterior cladding. We adjust the timber and finish for climate and use case.

Outdoor Saunas & Wood Choice

Can I use an indoor sauna outdoors?

No — never. Indoor saunas don't have the weatherproof exterior cladding, deeper insulation, or proper roof needed for rain, sun and humidity. Putting one outside, even under a covered area, will let moisture into the wall stack within months and the wood and electrical components will start to fail. If your sauna will live outside, it has to be built as an outdoor sauna from the start.

How important is sheltering an outdoor sauna?

Very. Even a properly-built outdoor sauna lasts far longer when partially sheltered — under an eave, pergola, or covered terrace. Driving rain, full sun and standing water around the base age exterior wood fastest. A small overhang above the door and a foundation that drains away from the structure add years to the cladding before any major refurbishment.

Which wood is best for outdoor exterior cladding?

Teak, by a wide margin. Thai teak has the natural oils and density to handle our climate with the least maintenance — typically just teak oil once or twice a year. Red cedar, despite its reputation, is not what we recommend for outdoor exterior here: it weathers grey quickly and needs oiling 3–6 times a year to stay looking its best. Pine should never be installed as raw exterior cladding outdoors — it must first be charred (yakisugi / shou sugi ban).

Why do you char (yakisugi) pine for outdoor use?

Untreated pine swells, splits and rots quickly in our climate. Charring carbonises the outer few millimetres of timber, sealing the surface against water, insects and UV. Done properly it makes pine last for decades and gives a distinctive black, textured finish. For outdoor pine saunas we char the exterior face by default, and recommend doing the interior face as well so moisture cannot enter the timber from either side.

Outdoor Sauna Maintenance

How often do I re-oil the exterior?

It depends on the wood and exposure. Teak: 1–2 times a year with teak oil. Charred pine: 2–4 times a year. Red cedar: 3–6 times a year. A sauna fully under cover needs less; one in open sun and rain needs more. Check quarterly and oil whenever the wood looks dry, faded, or patchy.

How often should I inspect my outdoor sauna?

At least once a month, and after every heavy storm. Look for: dark damp patches on the cladding, lifting or warping boards, gaps in silicone joints or around the door, signs of insects at the base, water pooling near the foundations, and any change to the roof. The point is to catch small issues — a popped board, a tiny leak — before they turn into moisture damage inside the wall stack, which is much harder and more expensive to fix.

What does ongoing outdoor sauna maintenance look like?

More than for an indoor one — an outdoor sauna is exposed to weather every day, and staying like new for many years means treating maintenance as routine, not reactive. After every use: leave the door open so the interior dries out completely. Monthly: wipe the interior with clean water (never chemicals), check the heater stones, sweep underneath. Quarterly: full walkaround of cladding, roof, door seal, foundation drainage and silicone joints. 1–6 times a year depending on wood: re-oil the exterior. Yearly: re-check all silicone, re-tighten any loose hardware, replace any cracked heater stones, touch up any spots looking duller than the rest. A neglected outdoor sauna can look tired in 1–2 years; a properly maintained one stays beautiful for decades.

Use & Maintenance

How do I look after the wood?

Inside, only ever clean with water — never any chemicals. Outside, the cladding needs periodic oiling and a regular eye on the weather — see the Outdoor Saunas sections above for the full schedule.

How hot does a sauna get?

A traditional Finnish sauna runs at 70–100 °C with low humidity, raised by throwing water on the stones (löyly). We also build infrared saunas, where our IR panels run at 80–90 °C.

Is it safe to use every day?

For healthy adults, yes — daily use is common in Finland. 15–20 minute sessions, hydrate, cool down between rounds. Anyone with heart conditions, pregnancy, or specific medical concerns should check with their doctor.

Orders & Payment

How do I order?

Contact us through the website with your requirements. For custom saunas we send a quote, refine the spec, and confirm on 50% deposit with 50% due before dispatch. For catalogue and imported items, full payment confirms the order.

What payment methods do you accept?

Card payments and QR code are handled securely through Stripe. We also accept bank transfer (Bangkok Bank) and international wire transfer for overseas orders.

Can I see one before I buy?

We can arrange a video walkthrough of a current build, share reference projects, or — for serious enquiries — a site visit in Surin. You can also visit our showroom in Bang Saen to see a sauna in person.

Still have questions?

We reply in English, Finnish, Swedish or Thai. Tell us about your space and we'll help you spec the right sauna.

Contact us