Duckboards: What They Are and Why Slatted Wood Helps

What is a duckboard

A duckboard is a removable floor panel made of parallel wood slats with gaps between them. You have likely seen one underfoot in a locker room, a pool deck, or a shower. In a sauna, the duckboard sits on top of the existing floor, which is usually concrete, tile, or sealed wood.

The slats are spaced so that water, sweat, and rinse-off can fall through instead of pooling under your feet. The board itself is not attached to the floor, so you can lift it out for cleaning or to let it dry between sessions.

Why drainage matters in a sauna

A traditional sauna is a wet environment. Bathers sweat, pour water on the heater stones to create steam, and often rinse off inside the cabin. All that moisture has to go somewhere. If it collects on a solid floor, it turns into puddles, which are slippery and slow to dry.

A duckboard solves this by raising you above the wet surface. Water passes through the gaps and spreads out underneath, where it can evaporate or run toward a floor drain. The air movement under the board also helps the wood dry faster, which reduces the chance of mold and odors over time.

The Finnleo guide to sauna flooring notes that the best floor for a traditional sauna is cement, tile, or anything that does not absorb water. A duckboard is not a replacement for that kind of base floor, but it is a comfortable, dry layer on top of it.

How a duckboard insulates you from the floor

A sauna heats the air, but the floor stays cooler because heat rises. If you are standing barefoot on tile or concrete, your feet can feel noticeably colder than the rest of your body. A wood duckboard adds a thin but effective buffer between your skin and that cold surface.

Wood is a poor conductor of heat compared to tile or concrete, so it does not pull warmth away from your feet as quickly. The air trapped in the gaps under the board adds insulation value too. The result is a floor that feels more even in temperature, which makes the whole session more comfortable, especially in an indoor sauna where the floor may be in contact with a cold foundation.

Choosing a wood for your duckboard

The best woods for a sauna duckboard are the same species used for benches and walls: cedar, hemlock, aspen, and alder. These woods resist moisture, do not splinter easily, and stay relatively cool even when the room is hot.

Cedar is the most common choice because it handles humidity well and has a natural resistance to decay. Hemlock is a durable and budget-friendly alternative, and aspen is smooth, light colored, and does not have the strong resin smell that some pines have. If you are comparing wood options, the guide to cedar vs hemlock and the guide to which sauna wood is best cover the differences in more depth.

Duckboards versus floor mats

A duckboard is one option for your sauna floor, but not the only one. Some sauna owners use a rubber or foam floor mat instead. A mat is easier to wipe down, but it does not allow water to pass through it the way slatted wood does, and it may hold moisture against the floor.

If you choose a mat, look for one that is heat rated and designed for sauna use, since standard rubber can soften or give off an odor in high heat. The trade-off between a duckboard and a mat comes down to whether you want the open drainage of slats or the easy-clean surface of a mat. For most traditional saunas, a duckboard is the better fit. Our guide to sauna flooring options compares the two side by side.

If you have a steam shower or a wet room where water is constantly running, a duckboard is also a common choice, although the material needs to hold up to more frequent saturation. The mat for glass shower floor article covers the shower-specific options.

Caring for a duckboard

A duckboard needs very little care, but it does need to dry. After each sauna session, lift the board and lean it against a wall or set it outside the cabin so air can reach both sides. If it stays in place on a wet floor, the underside can stay damp for a long time.

Occasionally rinse the board with clean water to wash away sweat and salts, then let it dry fully. Do not sand or oil the surface aggressively, since a rough or coated surface can feel uncomfortable under bare feet. The cleaning section in the sauna flooring options guide has more detail on routines.

Wood slats may darken over time as they absorb moisture and heat. This is a natural aging process, not a sign that the board is failing. As long as the slats stay firm and do not splinter, a duckboard can last for many years. See the article on wood darkening and aging if you want to know what to expect.

What to pick for your use

Questions

Do I need a duckboard in my sauna?

A duckboard is not technically required for a sauna to function, but it is strongly recommended for comfort and hygiene. It keeps your feet off the cold floor and lets sweat and rinse water drain away instead of pooling.

What is the difference between a duckboard and a floor grate?

The two terms are often used interchangeably. Both describe a slatted wood panel with gaps that let water pass through. A duckboard is usually a removable panel, while a grate may be built into the floor or drain area.

Can I use a duckboard with an infrared sauna?

Yes. Infrared saunas typically do not involve pouring water, but you still sweat, and a duckboard keeps your feet off the floor and allows air to circulate. The heat in an infrared cabin is lower, but wood is still a comfortable floor layer.

How long does a wooden duckboard last?

With basic care, including lifting it to dry between sessions, a wood duckboard can last for several years. Cedar and hemlock are naturally resistant to moisture and decay, which helps them hold up in a humid sauna environment.