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HowTo
House with a Doma｜Stylish Japanese-Style Rooms｜How To
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An Ambiguous Zone Connecting Interior and Exterior.
The doma is a rich, ambiguous space that is neither fully exterior nor interior. It allows for activities without removing shoes, making it versatile for tasks such as gardening, bicycle maintenance, and DIY projects. By incorporating the traditional Japanese doma concept into modern residences, the scope of daily living is expanded. -
Spacious Earthen Floor Area Extending from the Entrance.
By extending the earthen floor beyond the entrance to the living room and kitchen, a dynamic spatial experience is created. This design enhances practicality by allowing bicycles and strollers to be pushed directly inside and providing a temporary storage area for shopping bags. The earthen floor becomes an integral part of the daily circulation, resulting in a flexible and functional living environment. -
Flooring Materials: Mortar and Tiles.
For earthen floors, hard and durable materials such as mortar finishes, tile installations, or exposed aggregate surfaces are suitable. The atmosphere can vary significantly depending on the color and texture, so select materials that harmonize with the overall design of the residence. The choice of material ultimately defines the character of the earthen floor. -
Seating Area Utilizing Level Differences.
By incorporating a level difference between the earthen floor and the interior floor, the stepped section serves as a seating area. Occupants can sit on the interior side to put on shoes or sit on the earthen floor side to enjoy views of the garden, enabling versatile usage. The level difference creates a distinct place within the space. -
Compatibility with Wood-Burning Stoves.
Installing a wood-burning stove on an earthen floor allows you to leverage the floor's fire-resistant properties. Tasks such as carrying in firewood and cleaning out ashes can be performed on the earthen floor without concern for dirt or damage. The lifestyle centered around the warmth of the fire harmonizes exceptionally well with the earthen floor. -
Storage for Bicycles and Motorcycles.
With a dirt floor area, bicycles and motorcycles can be stored indoors. This eliminates concerns about theft and provides protection from rain and wind. Maintenance work can also be performed on the dirt floor, allowing the space to function as an area to enjoy your hobby. The dirt floor thus serves as a garage for your prized vehicles. -
Earthen Floor as a Workspace.
For activities that involve dirt and mess, such as DIY projects, pottery, and gardening, an earthen floor provides an ideal workspace. It allows for the use of water and tolerates floor soiling without concern, enabling full concentration on the task at hand. By installing workbenches and shelving, the space can also function effectively as a professional-grade atelier. -
Ideal for Living with Pets.
For households with dogs, the earthen floor area allows for wiping paws after walks and storing pet supplies. This space provides a comfortable environment for pets, functioning as an intermediate zone between the interior and exterior. The earthen floor plays a significant role in harmonious living with pets. -
Thermal Insulation, Airtightness, and Thermal Environment.
Since the earthen floor tends to become cold during winter, enhancing thermal insulation and airtightness improves comfort. Conversely, it also offers the benefit of feeling cooler in summer. Adjusting the thermal environment according to the seasons is key to ensuring year-round comfort. -
Multipurpose functionality enabled by storage shelving.
By installing storage shelves on the walls of the earthen floor area, a variety of items such as shoes, outdoor equipment, tools, and gardening supplies can be organized efficiently. Both open shelves and those with doors can be selected according to the intended use. Enhanced storage capacity improves the functionality of the earthen floor space. -
A Place for Family Gatherings.
By integrating the earthen floor area with the dining and living spaces, it becomes a lively place where the family gathers. Placing tables and chairs on the earthen floor allows for dining, children’s play, and other flexible uses. The earthen floor becomes the focal point of daily life. -
Fusion of Tradition and Modernity.
The doma is a traditional Japanese space, but by integrating it with contemporary design, a new appeal emerges. Combining modern furniture and lighting creates a unique blend of Japanese and Western aesthetics. While inheriting tradition, create a doma that suits modern living. -
Types of Tatami and Selection of Edging
Tatami mats vary in size standards depending on the region, such as Kyoma and Edoma. Recently, Ryukyu tatami and edging-less tatami have also gained popularity. Tatami with edging offers a traditional and serene aesthetic, while edging-less tatami provides a modern and clean appearance. The materials for tatami surface coverings have expanded from natural rush grass to include washi paper and resin options, allowing for a broader range of choices. It is advisable to consider maintenance requirements and intended usage when selecting the appropriate tatami type. -
The Relationship Between Ceiling Height and Sense of Calm.
Compared to Western-style rooms, Japanese-style rooms feature slightly lower ceilings, which create a tranquil atmosphere. Assuming a lifestyle centered around sitting on the floor, a ceiling height of approximately 2.1 to 2.3 meters does not induce a sense of confinement; rather, it provides a comfortable, enveloping feeling. However, when incorporating a sunken kotatsu or anticipating the use of chairs, it is necessary to consider ceiling heights appropriate to these functions. -
Selection and Operation of Joinery
Traditional joinery such as shoji screens and fusuma sliding doors are crucial elements that define the ambiance of a Japanese-style room. Shoji screens diffuse soft light into the interior, imparting a sense of depth to the space. Utilizing sliding doors allows for wider openings, fostering a seamless connection with adjacent areas. Attention to the design of the joinery's stiles and rails further enhances a refined and sophisticated impression. -
A Contemporary Interpretation of the Tokonoma.
While incorporating a traditional tokonoma is commendable, it can also be simply reinterpreted to suit modern living. Creating a niche approximately 15 cm deep within the wall to display flowers or hanging scrolls, or fabricating a low decorative shelf, allows for a functional space that preserves the spiritual essence of the tokonoma. -
Creating Shadows and Highlights through Lighting Design.
The charm of a Japanese-style room lies in the beauty of soft light and shadows. By effectively utilizing indirect lighting and selecting lantern-style fixtures, a calm and serene atmosphere can be achieved. Recessed downlights installed in the ceiling, equipped with dimming functions, allow for brightness adjustments tailored to various uses. Subtle, gentle illumination rather than overly bright light complements the traditional Japanese space. -
Texture of Wall Finishes.
Plaster finishes such as Juraku plaster and diatomaceous earth plaster impart depth and texture to Japanese-style rooms. These materials are breathable and offer moisture-regulating effects. Even when opting for wallpaper finishes, selecting ones with Japanese paper or woven fabric textures allows for a finish that preserves the traditional Japanese ambiance. Colors in subdued tones such as white, beige, or gray tend to harmonize well. -
Continuity with Other Spaces.
When adjoining the living room or dining area, a design that allows the openings to be fully opened for integrated use is convenient. Aligning the floor levels or intentionally raising one level alters the spatial impression. Introducing a step creates variation within the space and allows adjustment of the eye level when seated. However, if prioritizing barrier-free accessibility, consider a flat floor finish. -
Window Placement and Framing of Views
The windows in the Japanese-style room serve the purpose of framing the external scenery like a painting. By effectively utilizing low-set windows, one can enjoy the greenery of the courtyard garden. Additionally, the soft light filtered through the shoji screens further enhances the ambiance of the Japanese-style room. The placement of windows should be determined with consideration for both the interior views and the exterior appearance. -
The Choice of a Raised Japanese-Style Room.
Incorporating a raised Japanese-style room in a corner of the living area creates a distinct spatial articulation. The stepped platform can also be utilized as storage, offering functional advantages. A height of approximately 30 to 40 cm is typical, providing an ideal dimension for seating. However, when small children or elderly individuals are present, careful consideration of safety measures is essential. -
Incorporation of Tokobashira and Nageshi
In traditional Japanese-style rooms with an exposed post-and-beam structure, visible pillars impart a sense of formality to the space. Using fine timber for the tokobashira (alcove pillar) or creating visual lines with nageshi (horizontal wooden rails) evokes an authentic Japanese aesthetic. However, in contemporary residences, finished walls without exposed framing are common, and simpler, more modern Japanese-style rooms are also popular. Selection should be made according to the desired atmosphere. -
Incorporate Versatility in Usage.
The Japanese-style room serves not only as a guest room but also as a multifunctional space for family relaxation, a children's play area, and a place for folding laundry. Planning the arrangement of storage, lighting, and electrical outlets with the potential future use as a bedroom in mind allows the space to adapt to changes in life stages. -
Maintenance and Aging.
Tatami mats require flipping or replacement approximately every 5 to 10 years, and shoji paper also needs periodic reapplication. Although this maintenance demands effort, it is precisely through these processes that the space can be kept fresh, which is a distinctive appeal of Japanese-style rooms. By carefully tending to the natural aging of materials such as the scent of igusa rush and other natural elements, the space becomes one that fosters a deep sense of attachment.
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Q&A
House with a Doma｜Stylish Japanese-Style Rooms｜Q&A
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What is the practical size to allocate for a doma (earthen floor space)?
The appropriate size varies depending on its intended use, but an area of approximately 4 to 6 tatami mats allows for versatile functionality. For storage of bicycles or strollers, 2 to 3 tatami mats may suffice. Considering the family composition and lifestyle, it is advisable to design with some margin to accommodate potential future changes in use. -
What materials are suitable for flooring in earthen-floored spaces (doma)?
Common materials include tamped earth (sanwado), mortar, and tiles. Mortar is relatively inexpensive and provides a clean finish but requires measures to prevent cracking. Tiles offer excellent ease of cleaning and a wide range of design options. Natural tamped earth has moisture-regulating properties but requires regular maintenance. Selection should be made according to the intended use. -
How should the boundary between the earthen floor area and the living space be planned?
It is common practice to establish a clear distinction by incorporating a step or level difference. A height difference of approximately 15 to 20 centimeters helps prevent the intrusion of dust and dirt. Using sliding doors or shoji screens as partitions allows for flexible control between openness and privacy. Additionally, to maintain thermal performance, proper insulation and airtightness treatment at the boundary are crucial considerations. -
What are the appropriate methods for implementing thermal insulation measures in earthen floors?
The standard practice is to install insulation materials beneath the earthen floor slab, known as slab insulation. It is essential to use airtight gaskets between the foundation and the sill plate to prevent cold air infiltration into the interior. Additionally, an appropriate ventilation strategy is necessary to address condensation issues. Designing with consideration for the overall thermal performance balance of the entire residence is crucial. -
Is ventilation equipment necessary for work conducted on earthen floors?
Depending on the nature of the work, we recommend installing exhaust fans to manage odors, humidity, and dust emissions. It is effective to combine mechanical ventilation with natural ventilation. Please also consider integrating the system with a 24-hour ventilation system. -
Is it possible to design with an emphasis on the connection between the earthen floor space and the garden?
By incorporating sliding doors that provide direct access from the doma to the garden and creating large openings without level differences, a seamless integration between indoor and outdoor spaces can be achieved. Techniques such as extending the eaves to form a semi-outdoor area or continuing the doma flooring material onto the outdoor terrace are also effective. This approach results in a highly attractive residence that allows for gardening activities even during rainy weather. -
What design strategies can be employed to make a Japanese-style room versatile for multiple uses?
The use of movable partitions and stowable low tables is effective. Under normal circumstances, the space can remain open and airy, while during guest visits it can be separated into an independent reception room. Planning the locations of electrical outlets and lighting switches with various usage scenarios in mind also enhances convenience. -
Are there any key points to consider when choosing the color of tatami mats?
In addition to the traditional igusa grass color, there is now a wide variety of color options available. For example, tatami mats in shades such as sumi black, gray, or flax provide a modern and calm impression, and tend to harmonize well with flooring and contemporary furniture. Considering the balance with the flooring materials and joinery colors of adjacent spaces such as living-dining-kitchen areas and corridors will result in a cohesive and aesthetically pleasing environment. -
What type of window is suitable for a Japanese-style room?
A combination with shoji screens is both aesthetically pleasing and functional. If using a floor-to-ceiling sliding window, it can also serve as an engawa-like space. It is advisable to consider the window height relative to the seated eye level. Incorporating lattice or louvers can help maintain privacy while ensuring adequate ventilation. -
What type of lighting should be chosen for a Japanese-style room to create a sophisticated atmosphere?
Instead of installing a single light fixture in the center of the ceiling, it is elegant to combine multiple light sources. For example, use recessed downlights to keep the ceiling looking clean as the primary lighting, and add indirect lighting to illuminate the tokonoma alcove or walls. Placing a floor lamp made of washi paper at a low position lowers the visual weight, creating a calm and refined light-filled space. -
Is a tokonoma (alcove) necessary in contemporary residential architecture?
While not essential, a tokonoma enhances the elegance of a Japanese-style room. In cases where space is limited, a compact display shelf or a recessed wall niche can serve as an effective simplified tokonoma. By exhibiting seasonal flowers or calligraphy, it integrates traditional Japanese aesthetics into everyday living. -
Are there any design strategies to make a compact Japanese-style room appear more spacious?
Setting the ceiling lower than that of the living room and incorporating a horizontally oriented 'ground-level window' (chimado) are effective techniques. By directing the lower line of sight outward, these features create a sense of expansiveness and tranquility that exceeds the actual floor area. Additionally, the technique of 'wall integration,' where storage doors are finished in the same color and material as the surrounding walls, helps to streamline the space visually and enhance the perception of openness.
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