日本ロックウール株式会社, a wholly owned NICHIAS group company, holds the 国土交通大臣認定 耐火構造 certificates for its SprayAce and SprayAce SW sprayed rockwool fireproofing — FP060BM-9408, FP120BM-9411 and FP180BM-9414 for beams and FP060CN-9460, FP120CN-9463 and FP180CN-9466 for columns, alongside floor and external-wall approvals. It is a full member of the Rock Wool Association’s individual-certification register, and covers the country from five regional bases between Sapporo and Fukuoka.