Kota Goto Architectural Studio

Concrete Houses｜Key Points for Home Building｜Design and Insulation Strategies Emphasizing Material Texture

Author: Qurasuki Editorial Department

Architecture that draws on the tactile qualities of concrete is widely appreciated as an expressive approach that continues the spirit of modernism. The inorganic texture and commanding presence inherent to concrete impart a unique appeal to interior and exterior spaces. At the same time, exposed concrete finishes are highly dependent on construction precision for their level of refinement, and careful consideration of staining and deterioration over time is indispensable. Pursuing solutions to practical challenges such as thermal performance and waterproofing in collaboration with experienced designers and contractors is the key to realizing high-quality spaces.

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.