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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.
Clarification of Use.
The required height, area, and facilities vary depending on whether the loft is used for storage or as a study or bedroom. For storage purposes, keeping the ceiling height below 1.4 meters and the floor area to less than half of the total floor area exempts it from being included in the floor area ratio calculation. When used as a habitable room, greater height and area are required, and the treatment under the Building Standards Act changes accordingly.
Ceiling Height and Usability.
The ceiling height of a loft should be determined based on its intended use. For storage purposes, a height of approximately 1.2 to 1.4 meters is functional; however, if the loft is to be used as a study or bedroom, a height of 1.8 meters or more, allowing for sitting and standing, provides greater comfort. It is essential to decide the height with actual user movements in mind.
Selection of Access Methods
Access to the loft can be achieved through various means such as fixed stairs, ladders, or retractable stairs. Fixed stairs offer safety and ease of use but require more space. Ladders save space but are unsuitable for transporting bulky items. Consider the frequency of use and the type of items to be carried when choosing the most appropriate access method.
Ensuring Daylighting and Ventilation.
Lofts, being located at elevated positions, tend to accumulate heat. Installing windows allows for adequate daylighting and ventilation. To mitigate temperature rise during summer, consider the strategic placement of windows to facilitate cross-ventilation and the installation of exhaust fans. A bright and well-ventilated loft can be comfortably utilized as a living space.
Optimization of Storage Efficiency.
When utilizing a loft as storage, it is efficient to primarily store items with low usage frequency, such as seasonal goods and memorabilia. Custom-built shelves and drawers facilitate organization even within limited height constraints. Employing labeling and storage boxes enhances the ability to easily identify the location of stored items.
Measures for Thermal Environment Control.
Since the loft is located on the top floor, it tends to become hot in summer and cold in winter. Enhancing the roof's insulation performance significantly improves comfort. If the air conditioner's airflow does not reach effectively, installing a circulator can be considered. With a whole-house air conditioning system, the loft can also be maintained at a comfortable temperature.
Handrails and Fall Prevention.
For loft openings, handrails or knee walls are required to ensure safety. According to the Building Standards Act, handrails must be at least 1.1 meters in height. Selecting handrails that balance design aesthetics and safety creates a refined space. In households with small children, considering handrails of greater height is advisable.
Power Outlets and Communication Facilities.
When using the loft as a study or hobby room, it is essential to equip it with adequate power supply and communication infrastructure. Planning for outlets for computers and lighting fixtures, as well as Wi-Fi and LAN wiring, ensures a comfortable and functional space. Wiring plans must be integrated during the design phase, so it is important to clearly define the intended use in advance.
Selection of Flooring Materials.
Choose the loft flooring material according to its intended use. Plywood is sufficient for storage purposes; however, if the space is used as a living area, applying finishing materials such as hardwood flooring or carpet enhances comfort. It is important to select materials with consideration for sound transmission to the lower floors.
Sightlines and Sense of Openness.
Arranging the loft to overlook the lower floor creates a sense of unity and spatial expansion. When combined with a double-height ceiling, it results in an even more open environment. Conversely, when privacy is desired, it is important to incorporate balanced design strategies such as appropriate screening.
Verification of Regulatory Compliance.
Depending on the size and height of the loft, its classification under the Building Standards Act may change, affecting the floor area ratio and the number of permissible stories. When planning a loft for storage purposes, it must meet the conditions of having a ceiling height of 1.4 meters or less and a floor area not exceeding half of the floor below. It is essential to coordinate with the designer during the planning process.
Future Change of Use.
The use of a loft may change in accordance with shifts in life stages. It can transition from a children's play area to a secluded retreat during adolescence, and later to an adult study or hobby room. Designing with adaptability in mind ensures the loft remains functional and valuable over time.
Q&A
House with a Doma|Stylish Lofts|Q&A
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.
Do you have any ideas for utilizing a loft not merely as storage but as an attractive living space?
The loft’s appeal lies in its sense of exclusivity, much like a "secret hideout." For example, by placing numerous cushions on the floor, it can become a relaxing area to lie down while reading books or watching movies. Alternatively, installing a built-in counter can transform the space into a focused study or a hobby nook. This sense of escapism enriches everyday living with a touch of uniqueness.
What types of flooring materials are suitable for loft spaces?
It is important to consider sound transmission to the floors below. Carpeting is effective in absorbing footsteps, making it comfortable for family members occupying the lower levels. Additionally, since lofts are often used for sitting or reclining, materials with a pleasant tactile quality such as solid wood flooring or cork tiles are also well-suited for creating a comfortable and inviting environment.
When planning storage in a loft, what design strategies can make it more user-friendly?
The key is to leverage the low ceiling height by enhancing storage solutions positioned close to the floor. For example, installing built-in low shelving units along the walls or utilizing storage boxes with casters can be effective. Designating the space for storing seasonal or infrequently used items is also a smart approach to maximize usability.
Which is better for loft access, a ladder or stairs?
Ladders have the advantage of requiring minimal space for installation; however, caution is necessary regarding the safety of carrying items and ascending or descending. Fixed stairs, on the other hand, occupy more space but provide safer and more convenient daily use. It is also possible to incorporate storage beneath the stairs. It is advisable to choose based on how frequently and for what purpose the loft will be used.
I have heard that loft spaces can become hot in the summer. Are there any measures to ensure comfortable use?
Since lofts are located close to the roof, they tend to accumulate heat easily. To address this, it is crucial to enhance the roof's insulation performance thoroughly. Additionally, incorporating ceiling fans to promote air circulation and designing windows positioned high to exhaust hot air can help maintain a relatively comfortable environment even during the summer months.
Are there any legal restrictions or guidelines regarding ceiling height in loft spaces to ensure comfort?
Under the Building Standards Act, if the ceiling height is 1.4 meters or less, the space can be classified as an "attic storage," which is exempt from being included in the floor area calculation. Consequently, it is common to limit the ceiling height to 1.4 meters or below. While this height is sufficient for sitting activities, if the loft is intended for frequent standing use, it may be necessary to plan it as a habitable room.
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