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Sound insulation performance standard according to the Architectural Institute of Japan
Building Room purpose Part Application grade
Special grade
(Especially excellent)
Grade 1
(Excellent)
Grade 2
(Standard)
Grade 3
(Slightly inferior)
Multiple dwelling complex (Apartment/Condo) Living space Separation wall between adjacent units D-55 D-50 D-45 D-40
Hotel Guest room Separation wall between guest rooms D-55 D-50 D-45 D-40
Office Room requiring privacy in business Partition wall between rooms
Separation wall between tenants
D-50 D-45 D-40 D-35
Schools Regular classroom Partition wall between rooms D-45 D-40 D-35 D-30
Hospital Hospital room (individual room) V D-50 D-45 D-40 D-35

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