The Three Roof Haus by Masashi Nakamoto is a highly esteemed winner of the very prestigious 2024 A' Design Award in Silber in Architektur-, Gebäude- und Bauwerksdesign Competition Category.

SilberArchitektur· 2024

The Three Roof Haus

by Masashi Nakamoto

Client: Ader Co.,Ltd

A' Design Award in Silber Winner in Architektur Category

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Verified Award Winner
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The Design

About The Three Roof Haus

The Three Roof ist ein Haus in Okinawa, Japan. Traditionelle okinawanische Häuser verwenden lange Dachvorsprünge, um die subtropische Hitze zu reduzieren, doch tiefe Dachüberstände blockieren auch das Tageslicht und verdunkeln den Innenraum. Das Dach ist in drei Teile gegliedert, sodass Tageslicht von der Nordseite einfällt und die Luft leichter durch das Haus strömen kann. Das geteilte Dach verleiht jedem Bereich eine passende Deckenhöhe und schafft Abwechslung im Raum. Unter dem niedrigen Dachvorsprung befindet sich ein stützenfreier Raum von 4,0 Metern, der flexibel genutzt werden kann. Das Gebäude ist aus Stahlbeton mit Sichtbetonwänden errichtet.

The Recognition

About the A' Design Award in Silber

The Three Roof Haus ist Gewinner des A' Design Award in Silber, einer enorm prestigeträchtigen Anerkennung für erstklassige, großartige und beeindruckende Spitzendesigns. Silber-Gewinner sind ungemein brillante und äußerst kreative Werke, die die herausragende Expertise, das Talent und den Scharfsinn ihrer Designer veranschaulichen. Von The Three Roof Haus wird erwartet, dass es ein wunderbares Vorzeigewerk ist, das bemerkenswert professionell und zutiefst innovativ ist. Dieses mit dem A' Design Award in Silber prämierte Design ist eine höchst bemerkenswerte, bewunderte Erfindung, die den Grenzen von Kunst, Wissenschaft, Design und Technologie zugutekommt und sie voranbringt. The Three Roof Haus ist eine vielbeneidete Schöpfung, die Wünsche weckt, positive Gefühle vermittelt und Staunen und Verwunderung entfacht.

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties: By dividing the roof into three parts, It ensured daylight from the north side and made it easier for air to pass through. The split roof secures the ceiling height suitable for each place and brings about change in the space. It has a 4.0 meters space under the eaves in a pillarless space, but it keeps the height of the eaves low. Therefore, it is possible to protect a comfortable space with good ventilation while suppressing the strong sunlight of Okinawa.
Dimensions & Packaging: Site area : 753.04 m2 Building area : 318.00 m2 Total floor area : 285.93 m2 Structure : Reinforced Concrete Structure Main external finishes Roof : concrete Exterior wall : exposed concrete Main internal finishes Floor : Walnut flooring Inside Wall : exposed concrete Ceiling : Western red cedar & exposed concrete
Tags: Architecture, Single houses, Flexible space, Roof, Japan, Okinawa,
Production Technology: Both X and Y directions of this building are planned with wall type reinforced concrete construction, and steel pipe posts are arranged at places requiring consideration for landscape. Because of the mixed structure, earthquake resistant walls are arranged without bias, and column heads and column legs of steel pipes are embedded to evaluate spring rigidity. As the cantilever span has a maximum of 5.0 m, the roof is uniformly planned with an extremely thick mat slab of 450 mm.
Design Challenge: In this area at least one third of the roof must be slope. The plan is based on a pitched roof from the traditional Okinawan house. The split roof allows natural light where not blocked by structures such as pillars and walls. It also maintains its own structure, and the roof looks like it’s floating.
Research: Amahaji* is characterized by protection from the strong sunlight of Okinawa. It can be used for a variety of purposes, such as communicating with visitors, or sitting and looking outside. In addition, there is no wall between Amahaji and inside, and it is partitioned by fittings. In this project, the space is more than doubled compared to the traditional one.
Inspiration: The traditional okinawan house uses long eaves to stave off the subtropical heat. But it blocks natural light and darkens the house. In order to solve this problem, the roof was divided into three parts and the house was brightened by taking in natural light from between the roofs. There is also Amahaji which provides a flexible space under the eaves.
The space under the eaves is called “Amahaji” in Okinawa.
Project Duration: Okinawa Japan. The basic design started in March 2019. Completion date is December 2021.
The site is bordered by three roads and is elongated east west. The site is characterized by apartments and commercial facilities in the north, and a spacious landscape in the south.
Operation Flow: The purpose of this project was to make good use of the climate of Okinawa and provide comfortable living. There are many good hints in traditional architecture. Also it has construction techniques unique to the subtropical region so we have evolved them with modern construction technology to provide a more livable living space.
Patents: None
Image Credits: All images photo by Mamiyasan