Sauna Maintenance Guide: Keep Your Sauna in Great Shape

Sauna Maintenance Guide: Keep Your Sauna in Great Shape

A well-maintained sauna lasts 15-20 years or more. A neglected one starts showing problems in 3-5 years - mold, cracked wood, heater issues, and that musty smell nobody wants. The good news is that sauna maintenance is genuinely simple. Most tasks take 5-10 minutes, and the bigger seasonal jobs only come up once or twice a year.

This guide covers everything you need to do, organized by frequency so you can build it into your routine.

After Every Session (5 Minutes)

These quick tasks prevent 90% of maintenance problems. Do them every time you use your sauna.

1. Ventilate. Open the door and all vents fully. Leave them open for 1-2 hours (longer in humid climates) to let the wood dry completely. Trapped moisture is the number one cause of mold and wood decay.
2. Wipe down benches. Use a clean towel to wipe sweat off the bench surfaces. Body oils and sweat soak into the wood over time and create dark stains and odor.
3. Sweep or mop the floor. A quick pass with a damp mop removes sweat and debris from the floor. Don't leave standing water.
4. Check the heater. Make sure no towels, water containers, or other items are touching or leaning against the heater. This sounds obvious, but it's a surprisingly common fire risk.

Weekly Maintenance (15-20 Minutes)

Deep Clean the Benches

Once a week, scrub the benches with a solution of warm water and a small amount of mild, fragrance-free soap. Use a soft brush or cloth. Rinse with clean water and let the sauna air dry with the door open.

Do not use:

• Bleach or harsh chemical cleaners
• Scented soaps (the fragrance chemicals can off-gas when heated)
• Abrasive scrub pads on bare wood

Inspect the Floor

Check for any standing water or dark spots that suggest water is pooling and not draining. In outdoor saunas, check that the floor drain (if you have one) is clear of debris.

Check Door Seal

Open and close the door. It should close firmly but not require force. If it sticks, the wood may have swelled from moisture. If it's loose, the seal may have degraded. Both are easy fixes if caught early.

Monthly Maintenance (30-60 Minutes)

Inspect Heater Stones

Over time, sauna stones break down from the repeated heating and cooling cycles. Check for:

• Crumbled or cracked stones (replace these)
• Stone dust accumulating at the bottom of the heater (vacuum it out)
• Stones that have settled, leaving gaps around the heating elements (rearrange to maintain even coverage)

Replace all stones every 1-2 years for optimal performance, or sooner if you use your sauna daily.

Check Electrical Connections

Visually inspect the power cord, disconnect switch, and any visible wiring for signs of damage, discoloration, or loose connections. If anything looks off, have your electrician take a look before your next session.

Sand Rough Spots

Benches and backrests develop rough spots over time from sweat, cleaning, and general use. Lightly sand any rough patches with 120-150 grit sandpaper. Sand with the grain, not against it. This takes 5 minutes and keeps the benches comfortable.

Seasonal Maintenance (Twice a Year)

Spring Checkup (Outdoor Saunas)

After winter, give your outdoor sauna a thorough inspection:

• Exterior wood: Check for cracks, warping, or areas where the finish has worn off. Touch up with exterior wood stain or sealant as needed.
• Roof and flashing: Look for lifted shingles, cracked caulk around the chimney pipe (if wood-burning), or any signs of water intrusion.
• Foundation: Check that the sauna is still level and the foundation hasn't shifted from frost heave. A 4-foot level across the floor in both directions will tell you quickly.
• Ventilation openings: Make sure vents aren't blocked by leaves, insect nests, or debris.
• Door weatherstripping: Replace if cracked, flattened, or no longer sealing well.

Fall Prep (Outdoor Saunas)

Before winter hits:

• Apply a fresh coat of exterior wood treatment if the finish has faded
• Clear gutters and drainage around the foundation
• Check that the door closes tightly to prevent snow and ice from getting inside
• Insulate any exposed water lines if you have a water supply to the sauna

Dealing With Common Problems

Mold or Mildew

Mold appears as dark spots or fuzzy patches, usually in corners or where ventilation is poor. Clean it with a solution of 1 part white vinegar to 4 parts water. Apply, let sit for 10 minutes, scrub with a soft brush, and rinse. Then fix the ventilation issue that caused it - mold means the wood isn't drying between sessions.

Dark Stains on Benches

Body oil stains darken over time. Light sanding (120 grit) removes most surface stains. For deeper stains, sand with 80 grit first, then finish with 120. Always sand with the grain.

Musty Smell

Usually caused by trapped moisture. Run the heater at full temperature for 30-60 minutes with the door cracked open to cook off the moisture and kill bacteria. Then do a thorough cleaning and improve your post-session ventilation routine.

Heater Not Reaching Temperature

Common causes:

• Stones need rearranging or replacing (too much dust blocking airflow)
• One or more heating elements has failed (an electrician can test this)
• Temperature sensor has shifted position or failed
• Too much ventilation (partially close the exhaust vent during heat-up)

Maintenance Schedule Summary

Our outdoor saunas are built with FSC-certified heat-treated Canadian hemlock, which naturally resists moisture, decay, and insects better than untreated wood. That gives you a head start on maintenance, but it doesn't eliminate the need for regular care. Treat your sauna well and it will reward you with decades of use.

Need replacement stones or accessories for your maintenance routine? Check our sauna accessories collection.