International Residential Code 2015 (IRC 2015)

Part I — Administrative

Part II — Definitions

Part III — Building Planning and Construction

Part IV — Energy Conservation

Part V — Mechanical

Part VI — Fuel Gas

Part VII — Plumbing

Part VIII — Electrical

Part IX — Referenced Standards

Heads up: There are no amended sections in this chapter.

Appendix K Sound Transmission

This section has been amended at the state or city level.
Appendix K, Sound Transmission, of the International Residential Code is adopted in its entirety in the District of Columbia as Appendix K of the Residential Code.
Wall and floor-ceiling assemblies separating dwelling units, including those separating adjacent townhouse units, shall provide air-borne sound insulation for walls, and both air-borne and impact sound insulation for floor-ceiling assemblies.
Air-borne sound insulation for wall and floor-ceiling assemblies shall meet a sound transmission class (STC) rating of 45 when tested in accordance with ASTM E 90. Penetrations or openings in construction assemblies for piping; electrical devices; recessed cabinets; bathtubs; soffits; or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or otherwise treated to maintain the required ratings. Dwelling unit entrance doors, which share a common space, shall be tight fitting to the frame and sill.
The sound transmission class of concrete masonry and clay masonry assemblies shall be calculated in accordance with TMS 0302 or determined through testing in accordance with ASTM E 90.
Floor/ceiling assemblies between dwelling units, or between a dwelling unit and a public or service area within a structure, shall have an impact insulation class (IIC) rating of not less than 45 when tested in accordance with ASTM E 492.
ASTM E 90—04 Test Method for Laboratory
Measurement of Air-borne Sound
Transmission Loss of Building
Partitions and Elements
ASTM E 492—09 Specification for Laboratory
Measurement of Impact Sound
Transmission through Floor-ceiling
Assemblies Using the Tapping
The Masonry Society
TMS 0302—12 Standard for Determining
the Sound Transmission Class Rating
for Masonry Walls
UpCodes Premium
Leverage the most sophisticated code compliance platform.