Embraced in Recycled Steel

Embraced in Recycled Steel Office has a site area of 108,045.44 square meters.

Embraced in Recycled Steel Office has a building area of 1,091.12 square meters.

Embraced in Recycled Steel Office has a total floor area of 3,931.89 square meters.

Embraced in Recycled Steel Office has four floors above ground.

Embraced in Recycled Steel Office has a maximum height of 19.9 meters.

Embraced in Recycled Steel Office uses an RC structural system.

Embraced in Recycled Steel Office incorporates angle steel, flat bars, and deformed steel bars as interior finish elements.

Embraced in Recycled Steel Office received the Golden A' Architecture, Building and Structure Design Award in 2025.

The exterior Osirox metallic coating requires minimal maintenance—regular cleaning every two years and visual inspection for gloss retention. Recoating is recommended every 15 years.

As non-structural decorative elements, the interior steels are exempt from fireproof covering but meet Building Standard Law fire safety criteria for office interiors.

The steel louvers combined with sound-absorbing panels achieve an NRC of approximately 0.65, balancing acoustic comfort and spatial rhythm.

The Low-E double glazing achieves U ≈ 1.6 W/m²K, while the roof with 40 mm isocyanurate foam provides U ≈ 0.65 W/m²K.

Each LED fixture achieves approximately 140 lm/W, providing both high efficiency and symbolic light expression.

The building adopts individual package air-conditioning units, ensuring flexible zoning and energy efficiency.

The project follows JIS A 1901 equivalent standards, ensuring CO₂ below 1,000 ppm and formaldehyde below 0.08 ppm.

While not officially certified, the design follows CASBEE “A” level equivalent environmental performance criteria.

Interior steels retain their natural black mill scale with protective SOP coating, ensuring durability in indoor conditions.

The stairwell is engineered for 5.0 kN/m² live load, exceeding the standard office requirement.

The project complies with Japan’s Barrier-Free Law (Heartful Building Law), ensuring accessible routes, elevator dimensions, and restrooms for universal use.

A daylight factor of 2–3% was achieved through continuous ribbon windows and reflective ceilings.

LED fixtures are designed for 50,000 hours lifespan with annual inspection and cleaning every three years.

Low-E double glazing with argon gas filling, U ≈ 1.6 W/m²K, was adopted for thermal and acoustic performance.

Designed per Building Standard Law (Velocity Pressure 38 m/s) ensuring envelope stability under local conditions.

The building satisfies 1.00 structural safety factor, fully meeting Japanese seismic code requirements.

The foundation uses reinforced spread footings to accommodate stable sandy soil with N-value 20–25.

The roof has 1/100 slope and external drains with overflow protection, ensuring reliable rainwater discharge.

A 10-year warranty is offered for surface coating integrity under standard office conditions.

The recycled steels are expected to last over 60 years, matching RC structural durability.

The design metaphorically represents EAF billet recycling, symbolizing Kyoei Steel’s sustainable production cycle.

Natural black mill scale with clear SOP finish was chosen to emphasize material authenticity.

Annual energy consumption averages 125 MJ/m²·year, about 15% lower than conventional offices.

The building accommodates approximately 150 employees with collaborative and technical zones.

Emergency lighting complies with JIS Z 9111 and ensures illuminance over 1 lux during outage.

Cross-ventilation is achieved through staggered openings and double-height voids.

Floor steel plates are treated with anti-slip matte coating (R11 equivalent) for safety.

Through recycled steel use, the project achieved an approx. 30% reduction in embodied carbon compared to new material.

Performance is monitored by energy use, lighting comfort, and employee satisfaction surveys annually.