curved roof of japanese house by erika nakagawa rests on grid of concrete columns

curved roof of japanese house by erika nakagawa rests on grid of concrete columns

situated on the edge of a hairpin curve in the city of atami, japan, the momoyama house by japanese architect erika nakagawa is surrounded by the rich nature of its mountainous location. the two-base weekend residence incorporates a large, curved roof as its main feature, since an existing wall fence and the many trees on site have already defined, in a subtle way, its interior spaces.

curved roof of japanese house by erika nakagawa rests in grid of concrete columnsall images by koichi torimura



with the main focus on the design of the roof and the activities that will take place under it, erika nakagawa has constructed a grid of reinforced concrete columns to support the steel structure. though some of the columns are not placed within the house, but rather around its perimeter, they incorporate extending beams that connect to the roof for additional support.


‘it seemed enough intervention to just make a roof, because the site is enclosed by an existing wall, and there are so many trees,’ notes the architect, ‘so we focused on how to make the roof.’

curved roof of japanese house by erika nakagawa rests in grid of concrete columns



by surrounding the momoyama house with glass walls, the border between interior and exterior disappears, creating an open plan space where the kitchen and living room are in direct contact with the nature outside. ‘space made by such way creates an ambiguous border between interior and exterior – under the roof and out of the roof – having thus a generosity which is able to call the new building, the existing wall and the garden as one architecture,’ nakagawa explains.

curved roof of japanese house by erika nakagawa rests in grid of concrete columns    



project info:


name: momoyama house

architect: erika nakagawa office

main use: weekend house

main structure: reinforced concrete (partially steel)

location: atami, shizuoka, japan

site area: 458.17 sqm

building area: 174.09 sqm

total area: 149.36 sqm

    have something to add? share your thoughts in our comments section below.
    all comments are reviewed for the purposes of moderation before publishing.

    comments policy
    LOG IN
    designboom's comment policy guidelines
    generally speaking, if we publish something, it's because we're genuinely interested in the subject. we hope you'll share this interest and if you know even more about it, please share! our goal in the discussion threads is to have good conversation and we prefer constructive opinions. we and our readers have fun with entertaining ones. designboom welcomes alerts about typos, incorrect names, and the like.
    the correction is at the discretion of the post editor and may not happen immediately.

    what if you disagree with what we or another commenter has to say?
    let's hear it! but please understand that offensive, inappropriate, or just plain annoying comments may be deleted or shortened.

    - please do not make racist, sexist, anti-semitic, homophobic or otherwise offensive comments.
    - please don't personally insult the writers or your fellow commenters.
    - please avoid using offensive words, replacing a few letters with asterisks is not a valid workaround.
    - please don't include your website or e-mail address in your comments for the purpose of self-promotion.
    - please respect jury verdicts and do not discuss offensively on the competition results
    (there is only one fist prize, and designboom usually asks renown professionals to help us to promote talent.
    in addition to the awarded designs, we do feel that almost all deserve our attention, that is why we publish
    the best 100-200 entries too.)

    a link is allowed in comments as long as they add value in the form of information, images, humor, etc. (links to the front page of your personal blog or website are not okay). unwelcome links (to commercial products or services of others, offensive material etc. ) will be redacted. and, ... yes, spam gets banned. no, we do not post fake comments.


    a diverse digital database that acts as a valuable guide in gaining insight and information about a product directly from the manufacturer, and serves as a rich reference point in developing a project or scheme.

    architecture news

    keep up with our daily and weekly stories
    502,379 subscribers
    - see sample
    - see sample