International Code INTERPRETATIONS

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1 2015 International Code INTERPRETATIONS

2 2015 International Code Interpretations First Printing: June 2016 ISBN# Copyright 2016 by International Code Council ALL RIGHTS RESERVED. This 2015 International Code Interpretations is a copyrighted work owned by the International Code Council, Inc. Without advance written permission from the copyright owner, no part of this book may be reproduced, distributed, or transmitted in any form or by any means, including, without limitation, electronic, optical or mechanical means (by way of example and not limitation, photocopying, or recording by or in an information storage retrieval system). For information on permission to copy material exceeding fair use, please contact: ICC Publications, 4051 Flossmoor Road, Country Club Hills, IL Phone ICC-SAFE ( ). Trademarks: International Code Council, the International Code Council logo, and the International Building Code, International Residential Code, International Fire Code, International Mechanical Code, International Plumbing Code, International Existing Building Code, International Energy Conservation Code, and the International fuel Gas Code are trademarks of the International Code Council, Inc. PRINTED IN THE U.S.A.

3 PREFACE The 2015 International Codes promulgated by the International Code Council (ICC ) comprise a comprehensive set of model regulations for the design, construction and maintenance of safe buildings and structures. As a result of the performance nature of the International Codes, interpretations of the code provisions as they apply to a specific situation are sometimes necessary. Interpretation of the International Codes is a regular service offered to ICC members and is intended to be of an advisory nature, with final responsibility resting with the appropriate code official. In the development of this document, a review of ICC or Legacy Code Committee Interpretations published to date was conducted. Those interpretations that are no longer applicable because of changes in the code text were omitted. Those in which the essential interpretative issue is still relevant to the 2015 editions were edited by ICC technical staff and revised as necessary for applicability. The interpretations appearing in this book are in consecutive order according to code and section number. Applicable 2015 International Code text is included with each interpretation INTERNATIONAL CODE INTERPRETATIONS iii

4 International Building Code CHAPTER 1 SCOPE AND ADMINISTRATION GENERAL Scope Referenced codes Gas Mechanical Plumbing Property maintenance Fire prevention Energy Existing buildings DUTIES AND POWERS OF BUILDING OFFICIAL General Department records Approved materials and equipment Modifications PERMITS Required Validity of permit Expiration SUBMITTAL DOCUMENTS General Approval of construction documents Design professional in responsible charge Amended construction documents BOARD OF APPEALS Limitations on authority CHAPTER 2 DEFINITIONS DEFINITIONS CHAPTER 3 USE AND OCCUPANCY CLASSIFICATION ASSEMBLY GROUP A Assembly Group A Small buildings and tenant spaces Small assembly spaces Associated with Group E occupancies Accessory to places of religious worship Assembly Group A Assembly Group A Assembly Group A Assembly Group A Assembly Group A HIGH-HAZARD GROUP H High-hazard Group H INSTITUTIONAL GROUP I Institutional Group I MERCANTILE GROUP M Mercantile Group M UTILITY AND MISCELLANEOUS GROUP U General CHAPTER 4 SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY COVERED MALL AND OPEN MALL BUILDINGS Tenant separations Anchor building separation Openings between anchor building and mall Kiosks Mall width Minimum width Service areas fronting on exit passageways HIGH-RISE BUILDINGS Applicability Reduction in fire-resistance rating ATRIUMS General Enclosure of atriums GROUP I Corridor doors GROUP I Other occupancies HAZARDOUS MATERIALS Percentage of maximum allowable quantities Fire-resistance-rating requirements Explosion control COMBUSTIBLE DUSTS, GRAIN PROCESSING AND STORAGE Grinding rooms INTERNATIONAL CODE INTERPRETATIONS v

5 CHAPTER 5 GENERAL BUILDING HEIGHTS AND AREAS GENERAL BUILDING HEIGHT AND AREA LIMITATIONS Buildings on same lot MEZZANINES AND EQUIPMENT PLATFORMS Area limitation Openness UNLIMITED AREA BUILDINGS General Accessory occupancies Measurement of open spaces Reduced open space Nonsprinklered, one-story buildings Sprinklered, one-story buildings Mixed occupancy buildings with Groups A-1 and A Two-story buildings Group H-2, H-3 and H-4 occupancies Allowable area MIXED USE AND OCCUPANCY Accessory occupancies Occupancy classification Allowable building height Allowable building area Separation of occupancies Separation INCIDENTAL USES Separation and protection SPECIAL PROVISIONS Open parking garage beneath Groups A, I, B, M and R CHAPTER 6 TYPES OF CONSTRUCTION CONSTRUCTION CLASSIFICATION General Minimum requirements Type III COMBUSTIBLE MATERIAL IN TYPES I AND II CONSTRUCTION Allowable materials CHAPTER 7 FIRE AND SMOKE PROTECTION FEATURES FIRE-RESISTANCE RATINGS AND FIRE TESTS Fire-resistance ratings Nonsymmetrical wall construction Combustible components Restrained classification FIRE-RESISTANCE RATING OF STRUCTURAL MEMBERS Requirements Protection of the primary structural frame other than columns Embedments and enclosures EXTERIOR WALLS Openings Allowable area of openings Vertical exposure FIRE WALLS General Structural stability Penetrations FIRE BARRIERS Exterior walls Supporting construction FIRE PARTITIONS General Fire-resistance rating Continuity FLOOR AND ROOF ASSEMBLIES Unusable space FIRE-RESISTANT JOINT SYSTEMS General OPENING PROTECTIVES Fire door and shutter assemblies Side-hinged or pivoted swinging doors THERMAL- AND SOUND-INSULATING MATERIALS Insulation and covering on pipe and tubing.. 45 CHAPTER 8 INTERIOR FINISHES WALL AND CEILING FINISHES Interior wall and ceiling finish materials Interior finish requirements based on group DECORATIVE MATERIALS AND TRIM Combustible decorative materials Interior trim CHAPTER 9 FIRE PROTECTION SYSTEMS AUTOMATIC SPRINKLER SYSTEMS Group A Group S Stories without openings NFPA 13R sprinkler systems Alarms vi 2015 INTERNATIONAL CODE INTERPRETATIONS

6 905 STANDPIPE SYSTEMS Height FIRE ALARM AND DETECTION SYSTEMS Group I Group I Groups R-2, R-3, R-4 and I Audible alarms Average sound pressure Emergency voice/alarm communication systems Visible alarms CHAPTER 10 MEANS OF EGRESS GENERAL MEANS OF EGRESS Applicability Floor surface OCCUPANT LOAD Areas without fixed seating NUMBER OF EXITS AND EXIT ACCESS DOORWAYS Egress based on occupant load and common path of egress travel distance Single exits EXIT AND EXIT ACCESS DOORWAY CONFIGURATION Two exits or exit access doorways DOORS, GATES AND TURNSTILES Doors Size of doors Door swing Power-operated doors Special purpose horizontal sliding, accordion or folding doors Door operations Locks and latches Sensor release of electrically locked egress doors Panic and fire exit hardware STAIRWAYS Headroom Stairway landings EXIT SIGNS Illumination HANDRAILS Continuity GUARDS Where required Opening limitations CORRIDORS Construction Width and capacity Obstruction Dead ends Air movement in corridors Corridor continuity INTERIOR EXIT STAIRWAYS AND RAMPS Openings Penetrations Ventilation EXIT PASSAGEWAYS Exit passageways EXTERIOR EXIT STAIRWAYS AND RAMPS Exterior exit stairways and ramps Exterior exit stairway and ramp protection EXIT DISCHARGE General Exit discharge width or capacity ASSEMBLY Assembly main exit EMERGENCY ESCAPE AND RESCUE General Minimum size CHAPTER 11 ACCESSIBILITY SCOPING REQUIREMENTS Where required General exceptions ACCESSIBLE ROUTE Multistory buildings and facilities PARKING AND PASSENGER LOADING FACILITIES Groups I-1, R-1, R-2, R-3 and R CHAPTER 12 INTERIOR ENVIRONMENT INTERIOR SPACE DIMENSIONS Minimum ceiling heights CHAPTER 14 EXTERIOR WALLS PERFORMANCE REQUIREMENTS Weather protection INTERNATIONAL CODE INTERPRETATIONS vii

7 1405 INSTALLATION OF WALL COVERINGS Flashing COMBUSTIBLE MATERIALS ON THE EXTERIOR SIDE OF EXTERIOR WALLS Type I, II, III and IV construction Location CHAPTER 15 ROOF ASSEMBLIES AND ROOFTOP STRUCTURES WEATHER PROTECTION Flashing Locations ROOFTOP STRUCTURES Penthouses Height above roof deck Area limitation Use limitations CHAPTER 16 STRUCTURAL DESIGN GENERAL DESIGN REQUIREMENTS Risk category Multiple occupancies LOAD COMBINATIONS Basic load combinations Alternative basic load combinations LIVE LOADS Uniform live loads Reduction in uniform live loads Interior walls and partitions WIND LOADS Applications RAIN LOADS Controlled drainage FLOOD LOADS General Establishment of flood hazard areas CHAPTER 17 SPECIAL INSPECTIONS AND TESTS PRECONSTRUCTION LOAD TESTS General Exterior window and door assemblies Exterior windows and doors Exterior windows and door assemblies not provided for in CHAPTER 23 WOOD MINIMUM STANDARDS AND QUALITY Wood structural panels Strength adjustments GENERAL CONSTRUCTION REQUIREMENTS Wood structural panel sheathing Wood supported by exterior foundation walls Sleepers and sills CHAPTER 24 GLASS AND GLAZING SLOPED GLAZING AND SKYLIGHTS Screening Unit skylights and tubular daylighting devices SAFETY GLAZING Hazardous locations Glazing in doors Glazing adjacent to doors Glazing in windows Glazing in guards and railings Glazing and wet surfaces Glazing adjacent to stairways and ramps Glazing adjacent to the bottom stairway landing GLASS IN HANDRAILS AND GUARDS Loads CHAPTER 26 PLASTIC FOAM PLASTIC INSULATION Surface-burning characteristics CHAPTER 27 ELECTRICAL GENERAL Scope CHAPTER 29 PLUMBING SYSTEMS MINIMUM PLUMBING FACILITIES Separate facilities viii 2015 INTERNATIONAL CODE INTERPRETATIONS

8 CHAPTER 30 ELEVATORS AND CONVEYING SYSTEMS CONVEYING SYSTEMS General CHAPTER 31 SPECIAL CONSTRUCTION MEMBRANE STRUCTURES General TEMPORARY STRUCTURES Permit required CHAPTER 33 SAFEGUARDS DURING CONSTRUCTION GENERAL Scope APPENDIX D FIRE DISTRICTS D102 BUILDING RESTRICTIONS D102.1 Types of construction permitted D102.2 Other specific requirements D Exterior walls International Residential Code Part I Administrative CHAPTER 1 SCOPE AND ADMINISTRATION R101 GENERAL R101.2 Scope R102 APPLICABILITY R102.7 Existing structures R Additions, alterations or repairs R105 PERMITS R Determination of substantially improved or substantially damaged existing buildings in flood hazard areas Part III Building, Planning and Construction CHAPTER 3 BUILDING PLANNING R302 FIRE-RESISTANT CONSTRUCTION R302.3 Two-family dwellings R308 GLAZING R308.4 Hazardous locations R Glazing in doors R Glazing adjacent to doors R Glazing in windows R Glazing in guards and railings R Glazing and wet surfaces R Glazing adjacent to stairs and ramps R Glazing adjacent to the bottom stair landing R310 EMERGENCY ESCAPE AND RESCUE OPENINGS R310.1 Emergency escape and rescue opening required R310.2 Emergency escape and rescue openings R Minimum opening area R311 MEANS OF EGRESS R Floor elevations at the required egress doors R Winder treads R Landings for stairways R Stairway walking surface R316 FOAM PLASTIC R Crawl spaces CHAPTER 4 FOUNDATIONS R408 UNDER-FLOOR SPACE R408.3 Unvented crawl space CHAPTER 5 FLOORS R502 WOOD FLOOR FRAMING R502.7 Lateral restraint at supports CHAPTER 6 WALL CONSTRUCTION R602 WOOD WALL FRAMING R Drilling and notching of top plate INTERNATIONAL CODE INTERPRETATIONS ix

9 CHAPTER 8 ROOF-CEILING CONSTRUCTION R801 GENERAL R801.3 Roof drainage CHAPTER 9 ROOF ASSEMBLIES R905 REQUIREMENTS FOR ROOF COVERINGS R905.1 Roof covering application CHAPTER 11 [RE] ENERGY EFFICIENCY N1101 GENERAL N (R ) Fenestration product rating Part V Plumbing CHAPTER 31 VENTS P3101 VENT SYSTEMS P Venting required P3112 ISLAND FIXTURE VENTING P Vent connection International Fire Code CHAPTER 1 SCOPE AND ADMINISTRATION APPLICABILITY Construction and design provisions UNSAFE BUILDINGS General CHAPTER 2 DEFINITIONS GENERAL DEFINITIONS CHAPTER 5 FIRE SERVICE FEATURES FIRE APPARATUS ACCESS ROADS Where required Buildings and facilities Surface FIRE PROTECTION WATER SUPPLIES Required water supply CHAPTER 6 BUILDING SERVICES AND SYSTEMS FUEL-FIRED APPLIANCES Fuel oil storage inside buildings Quantity limits Restricted use and connection Applicability of maximum allowable quantity and control area requirements Installation Tanks in basements Underground storage of fuel oil ELECTRICAL EQUIPMENT, WIRING AND HAZARDS Appliances CHAPTER 8 INTERIOR FINISH, DECORATIVE MATERIALS AND FURNISHINGS INTERIOR WALL AND CEILING FINISH AND TRIM IN EXISTING BUILDINGS Interior finish requirements based on occupancy CHAPTER 9 FIRE PROTECTION SYSTEMS AUTOMATIC SPRINKLER SYSTEMS Group A Group S Stories without openings NFPA 13R sprinkler systems Alarms STANDPIPE SYSTEMS Height FIRE ALARM AND DETECTION SYSTEMS Group I Group I Groups R-2, R-3, R-4 and I Audible alarms Average sound pressure Emergency voice/alarm communication systems Visible alarms x 2015 INTERNATIONAL CODE INTERPRETATIONS

10 CHAPTER 10 MEANS OF EGRESS GENERAL MEANS OF EGRESS Applicability Floor surface OCCUPANT LOAD Areas without fixed seating NUMBERS OF EXITS AND EXIT ACCESS DOORWAYS Egress based on occupant load and common path of egress travel distance Single exits EXIT AND EXIT ACCESS DOORWAY CONFIGURATION Two exits or exit access doorways DOORS, GATES AND TURNSTILES Doors Size of doors Door swing Power-operated doors Special purpose horizontal sliding, accordion or folding doors Door operations Locks and latches Sensor release of electrically locked egress doors Panic and fire exit hardware STAIRWAYS Headroom Stairway landings EXIT SIGNS Illumination HANDRAILS Continuity GUARDS Where required Opening limitations CORRIDORS Construction Width and capacity Obstruction Dead ends Air movement in corridors Corridor continuity INTERIOR EXIT STAIRWAYS AND RAMPS Openings Penetrations Ventilation EXIT PASSAGEWAYS Exit passageways EXTERIOR EXIT STAIRWAYS AND RAMPS Exterior exit stairways and ramps Exterior exit stairway and ramp protection EXIT DISCHARGE General Exit discharge width or capacity ASSEMBLY Assembly main exit EMERGENCY ESCAPE AND RESCUE General Minimum size CHAPTER 32 HIGH-PILED COMBUSTIBLE STORAGE GENERAL FIRE PROTECTION AND LIFE SAFETY FEATURES Number of doors required Aisles CHAPTER 50 HAZARDOUS MATERIALS GENERAL PROVISIONS GENERAL REQUIREMENTS Maximum allowable quantity per control area Required detached buildings Percentage of maximum allowable quantities APPENDIX B FIRE-FLOW REQUIREMENTS FOR BUILDINGS B101 GENERAL B101.1 Scope APPENDIX C FIRE HYDRANT LOCATIONS AND DISTRIBUTION C101 GENERAL C101.1 Scope APPENDIX D FIRE APPARATUS ACCESS ROADS D101 GENERAL D101.1 Scope INTERNATIONAL CODE INTERPRETATIONS xi

11 International Mechanical Code CHAPTER 3 GENERAL REGULATIONS INSTALLATION Elevation of ignition source Construction and protection CHAPTER 4 VENTILATION GENERAL When required MECHANICAL VENTILATION Recirculation of air CHAPTER 5 EXHAUST SYSTEMS COMMERCIAL KITCHEN HOODS General HAZARDOUS EXHAUST SYSTEMS Where required Incompatible materials and common shafts CHAPTER 6 DUCT SYSTEMS GENERAL Air movement in egress elements PLENUMS Materials within plenums DUCT CONSTRUCTION AND INSTALLATION Underground ducts SMOKE DETECTION SYSTEMS CONTROL Return air systems CHAPTER 8 CHIMNEYS AND VENTS DIRECT-VENT, INTEGRAL VENT AND MECHANICAL DRAFT SYSTEMS Horizontal terminations Vertical terminations CHAPTER 10 BOILERS, WATER HEATERS AND PRESSURE VESSELS SAFETY AND PRESSURE RELIEF VALVES AND CONTROLS Installation CHAPTER 11 REFRIGERATION SYSTEM APPLICATION REQUIREMENTS Machinery room Industrial occupancies and refrigerated rooms International Fuel Gas Code CHAPTER 1 SCOPE AND ADMINISTRATION INSPECTIONS AND TESTING Approved inspection agencies Testing CHAPTER 3 GENERAL REGULATIONS INSTALLATION Elevation of ignition source CHAPTER 4 GAS PIPING INSTALLATIONS SHUTOFF VALVES Prohibited locations FLOW CONTROLS Venting of regulators APPLIANCE AND MANUFACTURED HOME CONNECTIONS Connecting appliances International Plumbing Code CHAPTER 4 FIXTURES, FAUCETS AND FIXTURE FITTINGS MINIMUM PLUMBING FACILITIES Minimum number of fixtures xii 2015 INTERNATIONAL CODE INTERPRETATIONS

12 CHAPTER 6 WATER SUPPLY AND DISTRIBUTION PROTECTION OF POTABLE WATER SUPPLY Connections subject to backpressure CHAPTER 10 TRAPS, INTERCEPTORS AND SEPARATORS INTERCEPTORS AND SEPARATORS Oil separators required Separation of liquids Oil separator design General design requirements Garages and service stations International Swimming Pool and Spa Code CHAPTER 3 GENERAL COMPLIANCE BARRIER REQUIREMENTS Outdoor swimming pools and spas Barrier height and clearances Structure wall as a barrier International Existing Building Code CHAPTER 2 DEFINITIONS GENERAL DEFINITIONS CHAPTER 14 PERFORMANCE COMPLIANCE METHODS GENERAL Additions International Energy Conservation Code CHAPTER 3 [CE] GENERAL REQUIREMENTS C303 MATERIALS, SYSTEMS AND EQUIPMENT C Fenestration product rating CHAPTER 3 [RE] GENERAL REQUIREMENTS R303 MATERIALS, SYSTEMS AND EQUIPMENT R Fenestration product rating INTERNATIONAL CODE INTERPRETATIONS xiii