Noise separation in multi family construction relies on Sound Transmission Class (STC) ratings for walls, Impact Insulation Class (IIC) ratings for floor-ceiling assemblies, and disciplined control of flanking paths through MEP penetrations. Massachusetts building code 780 CMR requires a minimum STC 50 for walls and floors separating dwelling units in multi-family buildings. Tenant complaints about […]
Building a duplex or triplex in Massachusetts as an owner-occupant or small investor typically runs $180 to $270 per square foot for construction, takes 12 to 18 months from concept to certificate of occupancy, and is newly supported by MBTA Communities Act rezoning in 177 municipalities plus a pending statewide duplex-by-right bill. Owner-occupants can finance […]
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