Virginia Existing Building Code

Transcription

1 2015 Virginia Existing Building Code

2 2015 Virginia Existing Building Code First Printing: September 2018 ISBN: COPYRIGHT 2018 by INTERNATIONAL CODE COUNCIL, INC. ALL RIGHTS RESERVED. This 2015 Virginia Existing Building Code contains substantial material from the 2015 International Existing Building Code, fifth 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 Existing Building Code, IEBC 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 EXISTING BUILDING 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 EXISTING BUILDING CODE

5 TABLE OF CONTENTS CHAPTER 1 ADMINISTRATION General Purpose and Scope Application of Code CHAPTER 2 DEFINITIONS General General Definitions CHAPTER 3 GENERAL PROVISIONS AND SPECIAL DETAILED REQUIREMENTS General Building Materials and Systems Fire Escapes Glass Replacement and Replacement Windows Seismic Force-resisting Systems Group B Teaching and Research Laboratories Reroofing and Roof Repair CHAPTER 4 ACCESSIBILITY General Change of Occupancy Additions Alterations Historic Buildings Glass Replacement and Replacement Windows (Deleted) Change of Occupancy (Deleted) Historic Buildings (Deleted) Moved Structures (Deleted) Accessibility for Existing Buildings (Deleted) CHAPTER 5 REPAIRS General Structural Flood Hazard Areas Electrical Mechanical Plumbing Additions (Deleted) Historic Buildings (Deleted) Relocated Buildings (Deleted) CHAPTER 6 ALTERATIONS General Level 1 Alterations Level 2 Alterations Level 3 Alterations Accessibility (Deleted) Structural (Deleted) Electrical (Deleted) Mechanical (Deleted) Plumbing (Deleted) CHAPTER 7 CHANGE OF OCCUPANCY General Special Use and Occupancy Building Elements and Materials Fire Protection Means of Egress Heights and Areas Exterior Wall Fire-resistance Ratings Electrical and Lighting Mechanical and Ventilation Plumbing Structural Assessibility CHAPTER 8 ADDITIONS General Heights and Areas Structural Flood Hazard Areas Means of Egress (Deleted) VIRGINIA EXISTING BUILDING CODE v

6 TABLE OF CONTENTS 806 Accessibility (Deleted) Structural (Deleted) Electrical (Deleted) Mechanical (Deleted) Plumbing (Deleted) Energy Conservation (Deleted) CHAPTER 9 HISTORIC BUILDINGS General Flood Hazard Areas Repairs Fire Safety Alterations Change Of Occupancy Structural Energy Conservation (Deleted) CHAPTER 10 MOVED BUILDINGS AND STRUCTURES General Requirements Building Elements and Materials (Deleted) Fire Protection (Deleted) Means of Egress (Deleted) Accessibility (Deleted) Structural (Deleted) Electrical (Deleted) Mechanical (Deleted) Plumbing (Deleted) Other Requirements (Deleted) Change of Occupancy Classification (Deleted) CHAPTER 11 RETROFIT REQUIREMENTS General Heights and Areas (Deleted) Structural (Deleted) Smoke Alarms in Occupancy Groups R and I-1 (Deleted) Accessibility (Deleted) Energy Conservation (Deleted) CHAPTER 12 CONSTRUCTION SAFEGUARDS General Protection of Adjoining Properties Temporary Use of Streets, Alleys and Public Property Fire Extinguishers Means of Egress Standpipe Systems Automatic Sprinkler System Accessibility Water Supply for Fire Protection CHAPTER 13 REFERENCED STANDARDS CHAPTER 14 COMPLIANCE ALTERNATIVE CHANGE OF OCCUPANCY General CHAPTER 15 CONSTRUCTION SAFEGUARDS (Deleted) CHAPTER 16 REFERENCED STANDARDS (Deleted) APPENDIX A GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING BUILDINGS A1-1 CHAPTER A1 SEISMIC STRENGTHENING PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS A1-1 A101 Purpose A1-1 A102 Scope A1-1 A103 Definitions A1-1 A104 Symbols and Notations A1-1 A105 General Requirements A1-2 A106 Materials Requirements A1-3 A107 Quality Control A1-5 A108 Design Strengths A1-6 A109 Analysis and Design Procedure A1-7 A110 General Procedure A1-7 A111 Special Procedure A1-7 vi 2015 VIRGINIA EXISTING BUILDING CODE

7 TABLE OF CONTENTS A112 Analysis and Design A1-9 A113 Detailed System Design Requirements A1-9 A114 Walls of Unburned Clay, Adobe or Stone Masonry A1-11 CHAPTER A2 EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAGMS A2-1 A201 Purpose A2-1 A202 Scope A2-1 A203 Definitions A2-1 A204 Symbols and Notations A2-1 A205 General Requirements A2-1 A206 Analysis and Design A2-2 A207 Materials of Construction A2-3 CHAPTER A3 PRESCRIPTIVE PROVISIONS FOR SEISMIC STRENGTHENING OF CRIPPLE WALLS AND SILL PLATE ANCHORAGE OF LIGHT, WOOD- FRAME RESIDENTIAL BUILDINGS A3-1 A301 General A3-1 A302 Definitions A3-1 A303 Structural Weaknesses A3-2 A304 Strengthening Requirements A3-2 CHAPTER A4 EARTHQUAKE RISK REDUCTION IN WOOD-FRAME RESIDENTIAL BUILDINGS WITH SOFT, WEAK OR OPEN FRONT WALLS A4-1 A401 General A4-1 A402 Definitions A4-1 A403 Analysis and Design A4-1 A404 Prescriptive Measures for Weak Story A4-3 A405 Materials of Construction A4-3 A406 Information Required to be on the Plans..... A4-4 A407 Quality Control A4-4 CHAPTER A5 EARTHQUAKE HAZARD REDUCTION IN EXISTING CONCRETE BUILDINGS A5-1 A501 Purpose A5-1 A502 Scope A5-1 A503 General Requirements A5-1 A504 Site Ground Motion A5-1 A505 Tier 1 Analysis Procedure A5-1 A506 Tier 2 Analysis Procedure A5-2 A507 Tier 3 Analysis Procedure A5-3 CHAPTER A6 REFERENCED STANDARDS.... A6-1 APPENDIX B SUPPLEMENTARY ACCESSIBILITY REQUIREMENTS FOR EXISTING BUILDINGS AND FACILITIES... B-1 B101 Qualified Historical Buildings and Facilities... B-1 B102 Fixed Transportation Facilities and Stations... B-1 B103 Dwelling Units and Sleeping Units B-1 B104 Referenced Standards B-1 APPENDIX C GUIDELINES FOR THE WIND RETROFIT OF EXISTING BUILDINGS C1-1 CHAPTER C1 GABLE END RETROFIT FOR HIGH-WIND AREAS C1-1 C101 General C1-1 C102 Definitions C1-1 C103 Materials of Construction C1-1 C104 Retrofitting Gable End Walls to Enhance Wind Resistance C1-3 CHAPTER C2 ROOF DECK FASTENING FOR HIGH-WIND AREAS C2-1 C201 General C2-1 C202 Roof Deck Attachment for Wood Roofs..... C VIRGINIA EXISTING BUILDING CODE vii

8 TABLE OF CONTENTS RESOURCE A GUIDELINES ON FIRE RATINGS OF ARCHAIC MATERIALS AND ASSEMBLIES Resource A-1 1 Fire-related Performance of Archaic Materials and Assemblies Resource A-2 2 Building Evaluation Resource A-3 3 Final Evaluation and Design Solution Resource A-6 4 Summary Resource A-13 Appendix Appendix RA-1 Resource A Table of Contents Appendix RA-1 Bibliography Appendix RA-120 INDEX Index-1 viii 2015 VIRGINIA EXISTING BUILDING CODE