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HowTo
Concrete Houses｜Stylish Japanese-Style Rooms｜How To
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The Beauty of Exposed Concrete.
The exposed concrete finish, which preserves the raw texture of the material, presents a rugged yet refined expression. The wood grain of the formwork and the location of joints all contribute to the unique character of the space. Achieving a beautiful finish requires precision in formwork and expertise in concrete placement techniques. Collaborate with experienced contractors to pursue the "beauty of the material." -
Quiet Living with Superior Sound Insulation Performance.
Concrete walls are characterized by their higher sound insulation performance compared to wooden structures. They effectively block external noise and prevent indoor sounds from leaking outside, creating a quiet and tranquil living environment. This is a significant advantage for multi-generational homes, houses designed for music enjoyment, or sites along major roads. It is an ideal construction method for those who prioritize privacy and serenity. -
Realization of Large Spaces and Wide Openings.
Reinforced concrete construction offers high structural flexibility, enabling the reduction of columns and walls to create expansive spaces and large openings. This facilitates the realization of dynamic spatial configurations and glass curtain walls that are challenging to achieve with timber construction. Enjoy the freedom of design where structure and aesthetics are seamlessly integrated. -
Variations of Surface Finishes.
Concrete offers a variety of finishing methods beyond exposed formwork, including painting, tiling, and plaster finishes. Painting the surface white imparts a bright and light impression, while a mortar finish creates a soft texture. It is also possible to selectively use exposed concrete on certain areas while applying different finishes elsewhere. -
Creating Texture Through Formwork Patterns.
The appearance of concrete varies significantly depending on the type and arrangement of the formwork. In addition to conventional plywood formwork, using cedar boards or decorative formwork can transfer wood grain or geometric patterns onto the concrete surface. The positioning of formwork joints and the arrangement of separators (metal fittings used to secure the formwork) can also be planned as integral elements of the design. -
Combination of Materials to Soften the Coldness.
Concrete can often feel cold both visually and tactilely. By combining solid wood flooring, wooden furniture, fabrics, and greenery, a warm and inviting space is created. Instead of using concrete throughout, incorporating different materials in moderation achieves a well-balanced and comfortable environment. -
Measures Against Condensation and Prevention of Internal Condensation.
Concrete walls with insufficient insulation are prone to condensation. It is essential to properly implement external or internal insulation methods to minimize temperature differences within the interior. Additionally, condensation within the wall assembly (internal condensation) can lead to structural deterioration; therefore, planning for vapor barriers and ventilation layers is indispensable. Insulation strategies should be developed considering both thermal comfort and durability. -
Creating Shadows and Highlights on Concrete through Lighting Design.
Exposed concrete walls dramatically change their appearance depending on how light falls upon them. By using indirect lighting and spotlights to create shadows and highlights, the texture of the material is accentuated, adding depth to the space. Natural light also alters the ambiance throughout the day, allowing for a variety of visual experiences. Lighting should be planned not merely to illuminate but as a tool to enhance the inherent beauty of materials. -
Degradation Countermeasures and Regular Maintenance.
Concrete is a highly durable material; however, surface protection and repairs are required periodically. Applying a water-repellent agent to exposed concrete can suppress rainwater penetration and mold growth. In the event of cracking, prompt repairs can extend the building's lifespan. To ensure long-lasting and aesthetically pleasing habitation, maintenance planning should be considered from the design stage. -
Utilization of Concrete Flooring.
By finishing the floor with concrete, a cohesive spatial unity is achieved. Embedding underfloor heating allows the high thermal mass of concrete to efficiently radiate heat, creating a warm environment from the ground up. This approach also enables a versatile, earthen-floor-like usage, resulting in a design that harmonizes both functionality and aesthetics. -
A Presence of Solidity and Stability.
Concrete houses convey a sense of solidity and presence in their exterior appearance. Even with a simple box-shaped design, the inherent strength of the material imparts a dignified character to the building. The subdued color palette, which harmonizes with the surrounding landscape, embodies a timeless beauty that transcends eras. Its quiet stance within the streetscape reflects the occupant's refined aesthetic sensibility. -
Living with the Beauty of Structure.
Concrete houses allow the structure itself to become the focal point of the space. With visible elements such as beams, columns, and wall thicknesses that support the building, residents can experience living while truly sensing the architecture. This beauty arises not from decoration but from necessity, which is the essence of concrete homes. -
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
Concrete Houses｜Stylish Japanese-Style Rooms｜Q&A
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I am drawn to exposed concrete houses for their modern and sculptural presence.
Concrete is a powerful and beautiful material that serves both as a structural element and a finished surface. Depending on the formwork technique, it can capture wood grain textures or be finished smoothly, offering a wide variety of expressive possibilities. -
What is the approach to interior design that utilizes the texture of concrete?
To soften the cool impression of concrete, it is effective to combine it with warm materials such as wood and fabrics. Through lighting design, one can highlight the beautiful shadows on the concrete surface, aiming to create a space that does not feel overly inorganic. -
How can a concrete house be designed to remain cool in summer and warm in winter?
Design strategies that leverage the thermal mass of concrete are key. In summer, solar shading is employed to minimize heat gain, while in winter, solar heat gain and enhanced insulation work together to maximize heat retention. When combined with underfloor heating, these measures enable stable indoor temperature control. -
What measures are taken to address the acoustic characteristics of concrete houses?
Due to the rigid nature of the material, sound reflections are pronounced, necessitating sound absorption measures. By effectively incorporating fabric materials such as carpets, curtains, and cushions, a comfortable acoustic environment can be achieved. -
What are the measures against mold and condensation in concrete houses?
The installation of mechanical ventilation systems and appropriate insulation planning are fundamental. Moisture control around areas such as bathrooms and kitchens is particularly important, requiring careful consideration of the capacity and placement of localized exhaust fans. Utilizing air conditioning units with dehumidification functions is also an effective countermeasure. -
How can a residence maintain the texture of concrete while creating a warm atmosphere?
Incorporating soft lighting through indirect illumination and introducing heating appliances such as fireplaces or pellet stoves that allow enjoyment of flickering flames are effective strategies. Additionally, placing greenery in courtyards or atriums can add a sense of vitality to otherwise inorganic spaces. -
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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