Virginia Residential Code

Transcription

1 2015 Virginia Residential Code

2 2015 Virginia Residential Code First Printing: September 2018 ISBN: COPYRIGHT 2018 by INTERNATIONAL CODE COUNCIL, INC. ALL RIGHTS RESERVED. This 2015 Virginia Residential Code contains substantial copyrighted material from the 2015 International Residential Code, second printing, which 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 use rights and permissions, please contact: ICC Publications, 4051 Flossmoor Road, Country Club Hills, IL Phone ICC-SAFE ( ). Trademarks: International Code Council, the International Code Council logo, ICC, the ICC logo, International Residential Code, IRC and other names and trademarks appearing in this book are registered trademarks of the International Code Council, Inc., and/or its licensors (as applicable), and may not be used without permission. T PRINTED IN THE USA

3 PREFACE Introduction The Virginia Uniform Statewide Building Code (USBC) is a state regulation promulgated by the Virginia Board of Housing and Community Development, a Governor-appointed board, for the purpose of establishing minimum regulations to govern the construction and maintenance of buildings and structures. The provisions of the USBC are based on nationally recognized model building and fire codes published by the International Code Council, Inc. The model codes are made part of the USBC through a regulatory process known as incorporation by reference. The USBC also contains administrative provisions governing the use of the model codes and establishing requirements for the enforcement of the code by the local building departments and other code enforcement agencies. In keeping with the designations of the USBC used previously, since the 2015 editions of the International Codes are incorporated by reference into this version of the USBC, it is known as the 2015 edition of the USBC. Arrangement The USBC is part of the Virginia Administrative Code (VAC), the official compilation of state regulations published under the authority and guidance of the Virginia Code Commission. Due to the difference in the section numbering system between the VAC and the model codes incorporated by reference into the USBC, the UBSC utilizes a dual section numbering system. In the USBC, the VAC section numbers are listed first, followed by a section number matching the model code system. In this printing of the USBC, the VAC section numbers are omitted and only the model code numbering system is utilized. The version of the USBC containing both the VAC section numbers and the model code numbering is available from the Virginia Department of Housing and Community Development (DHCD) and may also be accessed through the website of the Virginia Code Commission or by subscription to the VAC Overview The USBC is divided into three stand-alone parts. Part I contains regulations specific to the construction of new buildings and structures and is known as the Virginia Construction Code. Part II contains regulations specific to the rehabilitation of existing buildings, including repair, alterations, additions and change of occupancy in existing buildings and structures, and is known as the Virginia Existing Building Code. Part III of the USBC contains the regulations for the maintenance of existing structures which is enforced at the option of the local governments. It is known as the Virginia Maintenance Code. Codes Purchased from ICC The 2015 edition of the USBC is being made available in pamphlet form as in past editions of the USBC. In addition to the pamphlet form of the USBC published by DHCD, the International Code Council (ICC) publishes versions of the Virginia Construction Code, Virginia Existing Building Code, Virginia Maintenance Code and a series of Virginia-specific trade codes. In the ICC published versions, marginal markings are provided to distinguish between text which is part of the International Codes and text which is part of the state regulations. Double vertical lines in the margins within the body of the codes indicate state amendments to the International Codes. As in the standard print VIRGINIA RESIDENTIAL CODE iii

4 PREFACE ings of the International Codes, a single vertical line in the margins within the body of the code indicates a technical change from the previous edition of the International Codes. Deletions from the previous editions of the International Codes are indicated in the form of an arrow ( ) in the margin where an entire section, paragraph, exception or table has been deleted or an item in a list of items or a table has been deleted. Technical Assistance The local building departments and enforcing agencies may be contacted for further information concerning the USBC. Contact information for DHCD is below. DHCD, Division of Building and Fire Regulation State Building Codes Office 600 East Main Street, Suite 300 Richmond, Virginia Phone: (804) sbco@dhcd.virginia.gov Website: iv 2015 VIRGINIA RESIDENTIAL CODE

5 CHAPTER 1 ADMINISTRATION General Purpose and Scope Application of Code Enforcement, Generally Local Building Department Powers and Duties of the Building Official Fees Application for Permit Construction Documents Permits RDP Services Workmanship, Materials and Equipment Inspections Stop Work Orders Violations Certificates of Occupancy Temporary and Moved Buildings and Structures; Demolition Unsafe Buildings or Structures Appeals Part II Definitions CHAPTER 2 DEFINITIONS R201 General R202 Definitions Part III Building Planning and Construction CHAPTER 3 BUILDING PLANNING R301 Design Criteria R302 Fire-resistant Construction R303 Light, Ventilation and Heating R304 Minimum Room Areas R305 Ceiling Height R306 Sanitation R307 Toilet, Bath and Shower Spaces R308 Glazing R309 Garages and Carports R310 Emergency Escape and Rescue Openings R311 Means of Egress R312 Guards and Window Fall Protection R313 Automatic Fire Sprinkler Systems R314 Smoke Alarms R315 Carbon Monoxide Alarms R316 Foam Plastic R317 Protection of Wood and Wood-based Products against Decay R318 Protection against Subterranean Termites R319 Site Address R320 Accessibility R321 Elevators and Platform Lifts R322 Flood-resistant Construction R323 Storm Shelters R324 Solar Energy Systems R325 Mezzanines R326 Swimming Pools, Spas and Hot Tubs R327 Radon-Resistant Construction R328 Patio Covers R329 Sound Transmission R330 Fire Extinguishers R331 Interior Passage CHAPTER 4 FOUNDATIONS R401 General R402 Materials R403 Footings R404 Foundation and Retaining Walls R405 Foundation Drainage R406 Foundation Waterproofing and Dampproofing R407 Columns R408 Under-floor Space CHAPTER 5 FLOORS R501 General R502 Wood Floor Framing R503 Floor Sheathing VIRGINIA RESIDENTIAL CODE v

6 R504 Pressure Preservative-treated-wood Floors (On Ground) R505 Cold-formed Steel Floor Framing R506 Concrete Floors (On Ground) R507 Exterior Decks CHAPTER 6 WALL CONSTRUCTION R601 General R602 Wood Wall Framing R603 Cold-formed Steel Wall Framing R604 Wood Structural Panels R605 Particleboard R606 General Masonry Construction R607 Glass Unit Masonry R608 Exterior Concrete Wall Construction R609 Exterior Windows and Doors R610 Structural Insulated Panel Wall Construction CHAPTER 7 WALL COVERING R701 General R702 Interior Covering R703 Exterior Covering CHAPTER 8 ROOF-CEILING CONSTRUCTION R801 General R802 Wood Roof Framing R803 Roof Sheathing R804 Cold-formed Steel Roof Framing R805 Ceiling Finishes R806 Roof Ventilation R807 Attic Access CHAPTER 9 ROOF ASSEMBLIES R901 General R902 Fire Classification R903 Weather Protection R904 Materials R905 Requirements for Roof Coverings R906 Roof Insulation R907 Rooftop-mounted Photovoltaic Systems R908 Reroofing R909 Rooftop-mounted Photovoltaic Panel Systems CHAPTER 10 CHIMNEYS AND FIREPLACES R1001 Masonry Fireplaces R1002 Masonry Heaters R1003 Masonry Chimneys R1004 Factory-built Fireplaces R1005 Factory-built Chimneys R1006 Exterior Air Supply Part IV Energy Conservation CHAPTER 11 [RE] ENERGY EFFICIENCY N1101 General N1102 Building Thermal Envelope N1103 Systems N1104 Electrical Power and Lighting Systems (Mandatory) N1105 Simulated Performance Alternative (Performance) N1106 Energy Rating Index Compliance Alternative N1107 Existing Buildings General N1108 Additions N1109 Alterations N1110 Repairs N1111 Change of Occupancy or Use Part V Mechanical CHAPTER 12 MECHANICAL ADMINISTRATION M1201 General M1202 Existing Mechanical Systems CHAPTER 13 GENERAL MECHANICAL SYSTEM REQUIREMENTS M1301 General M1302 Approval M1303 Labeling of Appliances M1304 Type of Fuel vi 2015 VIRGINIA RESIDENTIAL CODE

7 M1305 Appliance Access M1306 Clearances from Combustible Construction M1307 Appliance Installation M1308 Mechanical Systems Installation CHAPTER 14 HEATING AND COOLING EQUIPMENT AND APPLIANCES M1401 General M1402 Central Furnaces M1403 Heat Pump Equipment M1404 Refrigeration Cooling Equipment M1405 Baseboard Convectors M1406 Radiant Heating Systems M1407 Duct Heaters M1408 Vented Floor Furnaces M1409 Vented Wall Furnaces M1410 Vented Room Heaters M1411 Heating and Cooling Equipment M1412 Absorption Cooling Equipment M1413 Evaporative Cooling Equipment M1414 Fireplace Stoves M1415 Masonry Heaters CHAPTER 15 EXHAUST SYSTEMS M1501 General M1502 Clothes Dryer Exhaust M1503 Range Hoods M1504 Installation of Microwave Ovens M1505 Overhead Exhaust Hoods M1506 Exhaust Ducts and Exhaust Openings M1507 Mechanical Ventilation CHAPTER 16 DUCT SYSTEMS M1601 Duct Construction M1602 Return Air CHAPTER 17 COMBUSTION AIR M1701 General CHAPTER 18 CHIMNEYS AND VENTS M1801 General M1802 Vent Components M1803 Chimney and Vent Connectors M1804 Vents M1805 Masonry and Factory-built Chimneys CHAPTER 19 SPECIAL APPLIANCES, EQUIPMENT AND SYSTEMS M1901 Ranges and Ovens M1902 Sauna Heaters M1903 Stationary Fuel Cell Power Plants M1904 Gaseous Hydrogen Systems CHAPTER 20 BOILERS AND WATER HEATERS M2001 Boilers M2002 Operating and Safety Controls M2003 Expansion Tanks M2004 Water Heaters Used for Space Heating M2005 Water Heaters M2006 Pool Heaters CHAPTER 21 HYDRONIC PIPING M2101 Hydronic Piping Systems Installation M2102 Baseboard Convectors M2103 Floor Heating Systems M2104 Low Temperature Piping M2105 Ground-Source Heat-Pump System Loop Piping CHAPTER 22 SPECIAL PIPING AND STORAGE SYSTEMS M2201 Oil Tanks M2202 Oil Piping, Fitting and Connections M2203 Installation M2204 Oil Pumps and Valves VIRGINIA RESIDENTIAL CODE vii

8 CHAPTER 23 SOLAR THERMAL ENERGY SYSTEMS M2301 Thermal Solar Energy Systems Part VI Fuel Gas CHAPTER 24 FUEL GAS G2401 General G2402 General G2403 General Definitions G2404 General G2405 Structural Safety G2406 Appliance Location G2407 Combustion, Ventilation and Dilution Air G2408 Installation G2409 Clearance Reduction G2410 Electrical G2411 Electrical Bonding G2412 General G2413 Pipe Sizing G2414 Piping Materials G2415 Piping System Installation G2416 Piping Bends and Changes in Direction G2417 Inspection, Testing and Purging G2418 Piping Support G2419 Drips and Sloped Piping G2420 Shutoff Valves G2421 Flow Controls G2422 Appliance Connections G2423 Compressed Natural Gas Motor Vehicle Fuel-dispensing Facilities G2424 Piping Support Intervals G2425 General G2426 Vents G2427 Venting of Appliances G2428 Sizing of Category I Appliance Venting Systems G2429 Direct-vent, Integral Vent, Mechanical Vent and Ventilation/Exhaust Hood Venting G2430 Factory-built Chimneys G2431 General G2432 Decorative Appliances for Installation in Fireplaces G2433 Log Lighters G2434 Vented Gas Fireplaces (Decorative Appliances) G2435 Vented Gas Fireplace Heaters G2436 Vented Wall Furnaces G2437 Floor Furnaces G2438 Clothes Dryers G2439 Clothes Dryer Exhaust G2440 Sauna Heaters G2441 Pool and Spa Heaters G2442 Forced-air Warm-air Furnaces G2443 Conversion Burners G2444 Unit Heaters G2445 Unvented Room Heaters G2446 Vented Room Heaters G2447 Cooking Appliances G2448 Water Heaters G2449 Air-Conditioning Appliances G2450 Illuminating Appliances G2451 Infrared Radiant Heaters G2452 Boilers G2453 Chimney Damper Opening Area G2454 Outdoor Decorative Appliances Part VII Plumbing CHAPTER 25 PLUMBING ADMINISTRATION P2501 General P2502 Existing Plumbing Systems P2503 Inspection and Tests CHAPTER 26 GENERAL PLUMBING REQUIREMENTS P2601 General P2602 Individual Water Supply and Sewage Disposal P2603 Structural and Piping Protection P2604 Trenching and Backfilling P2605 Support P2606 Penetrations P2607 Waterproofing of Openings P2608 Workmanship P2609 Materials Evaluation and Listing viii 2015 VIRGINIA RESIDENTIAL CODE

9 CHAPTER 27 PLUMBING FIXTURES P2701 Fixtures, Faucets and Fixture Fittings P2702 Fixture Accessories P2703 Tail Pieces P2704 Access to Connections P2705 Installation P2706 Waste Receptors P2707 Directional Fittings P2708 Showers P2709 Shower Receptors P2710 Shower Walls P2711 Lavatories P2712 Water Closets P2713 Bathtubs P2714 Sinks P2715 Laundry Tubs P2716 Food-Waste Disposer P2717 Dishwashing Machines P2718 Clothes Washing Machine P2719 Floor Drains P2720 Whirlpool Bathtubs P2721 Bidet Installations P2722 Fixture Fitting P2723 Macerating Toilet Systems P2724 Speciality Temperature Control Devices and Valves P2725 Nonliquid Saturated Treatment Systems CHAPTER 28 WATER HEATERS P2801 General P2802 Solar Water Heating Systems P2803 Water Heaters Used for Space Heating P2804 Relief Valves CHAPTER 29 WATER SUPPLY AND DISTRIBUTION P2901 General P2902 Protection of Potable Water Supply P2903 Water Supply System P2904 Dwelling Unit Fire Sprinkler Systems P2905 Heated Water Distribution Systems P2906 Materials, Joints and Connections P2907 Changes in Direction P2908 Support P2909 Drinking Water Treatment Units P2910 Nonpotable Water Systems P2911 Gray Water Nonpotable Water Systems P2912 Rainwater Nonpotable Water Systems P2913 Reclaimed Water Systems (Deleted) CHAPTER 30 SANITARY DRAINAGE P3001 General P3002 Materials P3003 Joints and Connections P3004 Determining Drainage Fixture Units P3005 Drainage System P3006 Sizing of Drain Pipe Offsets P3007 Sumps and Ejectors P3008 Backwater Valves P3009 Subsurface Landscape Irrigation Systems P3010 Replacement of Underground Sewers by Pipe Bursting Methods CHAPTER 31 VENTS P3101 Vent Systems P3102 Vent Stacks and Stack Vents P3103 Vent Terminals P3104 Vent Connections and Grades P3105 Fixture Vents P3106 Individual Vent P3107 Common Vent P3108 Wet Venting P3109 Waste Stack Vent P3110 Circuit Venting P3111 Combination Waste and Vent System P3112 Island Fixture Venting P3113 Vent Pipe Sizing P3114 Air Admittance Valves CHAPTER 32 TRAPS P3201 Fixture Traps VIRGINIA RESIDENTIAL CODE ix

10 CHAPTER 33 STORM DRAINAGE P3301 General P3302 Subsoil Drains P3303 Sumps and Pumping Systems Part VIII Electrical CHAPTER 34 GENERAL REQUIREMENTS E3401 General E3402 Building Structure Protection E3403 Inspection and Approval E3404 General Equipment Requirements E3405 Equipment Location and Clearances E3406 Electrical Conductors and Connections E3407 Conductor and Terminal Identification CHAPTER 35 ELECTRICAL DEFINITIONS E3501 General CHAPTER 36 SERVICES E3601 General Services E3602 Service Size and Rating E3603 Service, Feeder and Grounding Electrode Conductor Sizing E3604 Overhead Service and Service-entrance Conductor Installation E3605 Service-entrance Conductors E3606 Service Equipment General E3607 System Grounding E3608 Grounding Electrode System E3609 Bonding E3610 Grounding Electrode Conductors E3611 Grounding Electrode Conductor Connection to the Grounding Electrodes CHAPTER 37 BRANCH CIRCUIT AND FEEDER REQUIREMENTS E3701 General E3702 Branch Circuit Ratings E3703 Required Branch Circuits E3704 Feeder Requirements E3705 Conductor Sizing and Overcurrent Protection E3706 Panelboards CHAPTER 38 WIRING METHODS E3801 General Requirements E3802 Above-ground Installation Requirements E3803 Underground Installation Requirements CHAPTER 39 POWER AND LIGHTING DISTRIBUTION E3901 Receptacle Outlets E3902 Ground-fault and Arc-fault Circuit-interrupter Protection E3903 Lighting Outlets E3904 General Installation Requirements E3905 Boxes, Conduit Bodies and Fittings E3906 Installation of Boxes, Conduit Bodies and Fittings E3907 Cabinets and Panelboards E3908 Grounding E3909 Flexible Cords CHAPTER 40 DEVICES AND LUMINAIRES E4001 Switches E4002 Receptacles E4003 Luminaires E4004 Luminaire Installation E4005 Track Lighting CHAPTER 41 APPLIANCE INSTALLATION E4101 General CHAPTER 42 SWIMMING POOLS E4201 General E4202 Wiring Methods for Pools, Spas, Hot Tubs and Hydromassage Bathtubs E4203 Equipment Location and Clearances E4204 Bonding E4205 Grounding E4206 Equipment Installation x 2015 VIRGINIA RESIDENTIAL CODE

11 E4207 Storable Swimming Pools, Storable Spas, and Storable Hot Tubs E4208 Spas and Hot Tubs E4209 Hydromassage Bathtubs CHAPTER 43 CLASS 2 REMOTE-CONTROL, SIGNALING AND POWER- LIMITED CIRCUITS E4301 General E4302 Power Sources E4303 Wiring Methods E4304 Installation Requirements Part IX Referenced Standards CHAPTER 44 REFERENCED STANDARDS APPENDIX A SIZING AND CAPACITIES OF GAS PIPING A-1 APPENDIX B SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES, AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS B-1 APPENDIX C EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS C-1 APPENDIX D RECOMMENDED PROCEDURE FOR SAFETY INSPECTION OF AN EXISTING APPLIANCE INSTALLATION D-1 APPENDIX E MANUFACTURED HOUSING USED AS DWELLINGS E-1 AE101 Scope E-1 AE102 Application to Existing Manufactured Homes and Building Service Equipment E-1 AE201 Definitions E-2 AE301 Permits E-2 AE302 Application for Permit E-2 AE303 Permits Issuance E-3 AE304 Fees E-4 AE305 Inspections E-4 AE306 Special Inspections E-5 AE307 Utility Service E-5 AE401 Occupancy Classification E-5 AE402 Location on Property E-5 AE501 Design E-5 AE502 Foundation Systems E-6 AE503 Skirting and Perimeter Enclosures E-6 AE504 Structural Additions E-6 AE505 Building Service Equipment E-7 AE506 Exits E-7 AE507 Occupancy, Fire Safety and Energy Conservation Standards E-7 AE600 Special Requirements for Foundation Systems E-7 AE601 Footings and Foundations E-7 AE602 Pier Construction E-7 AE603 Height of Piers E-7 AE604 Anchorage Installations E-8 AE605 Ties, Materials and Installation E-8 AE606 Referenced Standards E-9 APPENDIX F RADON CONTROL METHODS... F-1 AF101 Scope F-1 AF102 Definitions F-1 AF103 Requirements F-1 APPENDIX G PIPING STANDARDS FOR VARIOUS APPLICATIONS G-1 AG101 Plastic Piping Standards G-1 AG102 Referenced Standards G-4 APPENDIX H PATIO COVERS H-1 AH101 General H-1 AH102 Definition H-1 AH103 Exterior Walls and Openings H-1 AH104 Height H-1 AH105 Structural Provisions H-1 AH106 Special Provisions for Aluminum Screen Enclosures in Hurricane-prone Regions.... H VIRGINIA RESIDENTIAL CODE xi

12 APPENDIX K SOUND TRANSMISSION K-1 AK101 General K-1 AK102 Air-borne Sound K-1 AK103 Structural-borne Sound K-1 AK104 Referenced Standards K-1 APPENDIX N VENTING METHODS N-1 APPENDIX P SIZING OF WATER PIPING SYSTEM P-1 AP101 General P-1 AP102 Information Required P-1 AP103 Selection of Pipe Size P-1 AP201 Selection of Pipe Size P-18 APPENDIX R LIGHT STRAW-CLAY CONSTRUCTION R-1 AR101 General R-1 AR102 Definitions R-1 AR103 Nonbearing Light Straw- Clay Construction R-1 AR104 Thermal Insulation R-2 AR105 Referenced Standard R-2 APPENDIX T RECOMMENDED PROCEDURE FOR WORST-CASE TESTING OF ATMOSPHERIC VENTING SYSTEMS UNDER N OR N1105 CONDITIONS 5ACH T-1 T101 Scope T-1 T202 General Definitions T-1 T301 Testing Procedure T-1 APPENDIX U SOLAR-READY PROVISIONS DETACHED ONE- AND TWO-FAMILY DWELLINGS, MULTIPLE SINGLE-FAMILY DWELLINGS (TOWNHOUSES)... U-1 U101 Scope U-1 U102 General Definitions U-1 U103 Solar-ready Zone U-1 INDEX INDEX-1 APPENDIX S STRAWBALE CONSTRUCTION S-1 AS101 General S-1 AS102 Definitions S-1 AS103 Bales S-1 AS104 Finishes S-2 AS105 Strawbale Walls General S-3 AS106 Strawbale Walls Structural S-5 AS107 Fire Resistance S-8 AS108 Thermal Insulation S-9 AS109 Referenced Standards S-9 xii 2015 VIRGINIA RESIDENTIAL CODE