Why do ondol rooms and wooden maru floors share a house?

An ondol room receives heat through its floor, while a traditional wooden maru is raised above the ground to allow ventilation. Together, they give a hanok spaces for different seasons and activities, linking rooms with the courtyard.

Why do ondol rooms and wooden maru floors share a house?

A hanok interior linking a wooden hall with rooms.

Inside a hanok, a floor made of fitted wooden boards may sit beside a room with a paper-finished floor. These different surfaces under one roof have different jobs. A traditional ondol room uses a heated floor to keep the room warm in cold weather; a maru raises its timber floor above the ground to avoid damp and allow air to circulate. Combining them gives a house both a warm place to stay and a space adapted to hot weather.

Seasons are only part of the explanation. Rooms used for daily life, a maru where people gather, and the courtyard beyond it also extend the household's usable space. Their arrangement varies: not every hanok has a central hall with matching rooms on either side. The National Hanok Center's explanations of construction and rooms and maru help connect floor construction with the use of space.

An ondol room receives heat from below

To understand traditional ondol, also called gudeul, follow the relationship between the agungi firebox, the gudeuljang stone slabs and the chimney. Heat from the firebox warms the broad, flat stones beneath the room's floor; the heated floor then releases warmth into the room. Smoke passes beneath the floor and leaves through the chimney. The fire is not lit on the surface where people live.

In the structure described by the National Hanok Center, the kitchen firebox serves cooking and room heating together. The connection between kitchen and room is therefore more than a doorway: it also involves a route for heat below the floor. That route is hidden in photographs of a finished room, so floor colour or furnishings alone cannot establish the condition of its heating system.

An ondol firebox at Unhyeongung; the photograph does not show the entire structure beneath the room.

The Hanok video and expert commentary on Woori History Net describe ondol rooms as enclosed interiors with a ceiling and hanji paper finishes. Beside the exposed timber structure of a maru, the contrast involves how walls and ceilings surround the space as well as what lies underfoot. This describes traditional residential space, not identical finishes in every preserved or remodelled hanok.

Look at both the timber joints and the space for air

A maru is a floor finished with wooden boards. A traditional maru is separated from the ground to avoid damp and permit ventilation. The National Hanok Center explains its development as a response to heat, in contrast to the floor-warming role of ondol. Exposed rafters in a daecheong hall also give it a different character from an enclosed ondol room.

Look for broad framing timbers with boards fitted between them. An umul-maru takes its name from the resemblance of its frame and boards to the character 井, meaning a well. Crosswise framing members sit between longer ones, with boards filling the spaces. The result differs from a floor made simply by running long boards in a single direction. This is a way to recognise the construction, not instructions for building one.

Framing timbers and fitted boards are visible in this maru at Namsangol Hanok Village.

Daecheong-maru and umul-maru are not two competing categories. Daecheong names a spacious timber-floored hall; umul-maru names a way of assembling a floor. Separating where a space is and how it is used from how its floor is made makes the terminology easier to follow.

Daecheong and toetmaru connect rooms with the courtyard

A daecheong-maru is a broad space where family members gather. The National Hanok Center describes the daecheong of an anchae, the household's inner quarters, as an open space between rooms, also used for family occasions such as weddings and ancestral rites. These uses and arrangements depend on the house's size and composition.

A toetmaru connects rooms or extends along their front toward the courtyard. Where the broad daecheong offers space to gather, the toetmaru helps explain the relationship between a room's edge and the outdoors. A maru was both a wooden floor inside the house and a meeting place between inside and outside.

Doors could alter that relationship. Woori History Net describes lift-up doors installed at a daecheong or between rooms and maru, which could be raised and suspended to connect spaces. Opening and closing them changed the divisions, allowing different uses for seasons or rituals. Courtyards could accommodate drying grain, preparing kimchi and holding celebrations, so the room–maru–courtyard connection was part of running a household.

The floor was a place to sit, eat and sleep

Ondol rooms and maru also share a tradition of taking off shoes and living close to the floor. The expert commentary on Woori History Net describes sitting on the floor to read and eat, and lying down to sleep. A warm room and an open hall have different characters, yet in both the floor itself was a place for daily life.

A furnished display room with a low desk and cushions illustrates life close to the floor.

This photograph shows a room arranged at Namsangol Hanok Village. It is not a photograph of a particular family's everyday life or evidence that the heating was running. It offers an example of how low furniture and seating relate to the floor. The Korea Heritage Portal also classifies Ondol Culture as national intangible heritage within traditional living customs and domestic life. That provides a context for considering ondol as a living tradition, alongside its heating function.

When looking at a hanok, let your attention move from the roof to the floor. The timber pattern, doors between rooms and maru, and openings toward the courtyard help explain why the two floors coexist. A warm room and an airy maru serve different purposes, while daily activities link the two spaces.

Photo credits

• Cover · Schölla Schwarz · photo source · CC BY 3.0 · supplied preview; no local changes

• Firebox · Holger Ebermann, Leipzig · photo source · CC BY-SA 3.0 · supplied preview; no local changes

• Maru floor · Neothinker · photo source · public domain · original; unchanged

• Floor-level living · Steve46814 · photo source · CC BY-SA 3.0 · original; unchanged

Why do ondol rooms and wooden maru floors share a house?