ICC Standard 400 2017

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ICC 400-2017: Standard on the Design and Construction of Log Structures

Published By	Publication Date	Number of Pages
ICC	2017	77

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Description

This standard provides the minimum design requirements for new log structures including structural, thermal envelope and fire resistance provisions. Notable changes from the 2012 edition: Definitions for construction documents, involved height, and mean roof height have been added. Definitions for bottom plate, log (starter log); checking; and sill log were revised for improved clarity and consistency with code language in other I-Codes. The common industry term, MCS (equilibrium moisture content), was added parenthetically. Moisture content and grade mark requirements have been revised to clarify the application of moisture content to grade marks and/or Certificates of Inspection. The design values portions of the standard have been reorganized and expanded to add clarity add address specific properties of wall logs and sawn and unsawn round timber beams. The engineering analysis option to qualify notches and bores were modified for clarity. AWPA Use Categories reference has been added for clarity of when the quality mark or certificate of treatment is required. Settling and settling due to slumping requirements were reviewed in depth and revised for clarity and consistency of direction for application, which should greatly assist interpretation of the log walls systems that involve slumping. Thermal envelope requirements have been revised to improve code consistency and clarity for interpretation. New requirements for infiltration have been added to put emphasis on sill logs and bottom plate logs of the log wall that is known to impact on air infiltration when not properly sealed. Wall penetration requirements were improved to add recognition of joints in the log wall. New requirements for flashing were added recognizing that special considerations are necessary for log structures. The prescriptive structural provisions requirements were modified to simplify interpretation of when structural engineering is required. The engineered structural provisions requirements were modified to clarify how log elements support loads and how those loads are calculated. The structural provisions for log walls have been modified to add a requirement for additional fastening at joints of abutting logs within a single course. The structural provisions for log walls have been modified to add a requirement for window sill logs to be continuous under the opening and extend beyond the opening on each side “equal to or greater than the length of the header log”.

PDF Catalog

PDF Pages	PDF Title
1	ICC 400-2017 STANDARD ON THE DESIGN AND CONSTRUCTION OF LOG STRUCTURES
2	ICC 400-2017 STANDARD ON THE DESIGN AND CONSTRUCTION OF LOG STRUCTURES TITLE PAGE
3	COPYRIGHT
4	AMERICAN NATIONAL STANDARD
6	FOREWORD
8	TABLE OF CONTENTS
10	CHAPTER 1 ADMINISTRATIVE PROVISIONS SECTION 101 ADMINISTRATIVE PROVISIONS SECTION 102 APPLICABILITY SECTION 103 PROVISIONS FOR COMPLIANCE SECTION 104 COMPLIANCE ALTERNATIVES SECTION 105 CONVENTIONS SECTION 106 INSPECTIONS SECTION 107 FOUNDATIONS SECTION 108 DESIGN LOADS
11	SECTION 109 REFERENCED DOCUMENTS
12	CHAPTER 2 DEFINITIONS SECTION 201 GENERAL SECTION 202 DEFINED TERMS
13	SECTION 203 SYMBOLS
16	CHAPTER 3 GENERAL REQUIREMENTS SECTION 301 GENERAL SECTION 302 MATERIALS
17	TABLE 302.2(1) LIST OF SPECIES COMBINATIONS
18	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
19	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
20	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
21	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
22	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
23	TABLE 302.2(1)—continued LIST OF SPECIES COMBINATIONS
24	TABLE 302.2(2) SECTION PROPERTIES OF SAWN AND UNSAWN ROUND TIMBER BEAMS
25	TABLE 302.2(3) BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
26	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER
27	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
28	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
29	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
30	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
31	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
32	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
33	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
34	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
35	TABLE 302.2(3)—continued BASE DESIGN VALUES FOR SAWN ROUND AND UNSAWN ROUND TIMBER BEAMS
36	TABLE 302.2(4) ADJUSTMENT FACTORS FOR WALL LOGS
37	TABLE 302.2(5) BASE DESIGN VALUES FOR WALL-LOGS
38	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
39	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
40	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
41	TABLE 302.2(5)—cotninued BASE DESIGN VALUES FOR WALL-LOGS
42	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
43	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
44	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
45	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
46	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
47	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
48	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
49	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
50	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
51	TABLE 302.2(5)—continued BASE DESIGN VALUES FOR WALL-LOGS
52	TABLE 302.2(6) APPLICABILITY OF ADJUSTMENT FACTORS FOR WALL LOGS AND SRTBs
54	FIGURE 302.2.4 NOTCHING AND BORING
55	SECTION 303 FIRE-RESISTANCE RATINGS OF LOGS AND LOG ASSEMBLIES
56	SECTION 304 PROVISIONS FOR SETTLING IN LOG STRUCTURES TABLE 304.2(1) MOISTURE CONTENT OF SELECTED WOOD SPECIES AT FIBER SATURATION (MCFSP)
57	TABLE 304.2(2) SHRINKAGE COEFFICIENTS
58	TABLE 304.2(3) PRESCRIBED SETTLING ALLOWANCE FOR NONHORIZONTAL BEARING SURFACES
59	TABLE 304.2(4) PRESCRIBED SETTLING ALLOWANCE DUE TO SHRINKAGE
61	FIGURE 304.2.2.3 CLIMATE ZONE MAP
62	SECTION 305 THERMAL ENVELOPE
63	TABLE 305.3.1.1 U-FACTOR OF LOG WALL (Uw) BY LOG THICKNESS (WL) AND SPECIFIC GRAVITY
64	TABLE 305.3.1.2 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa
65	TABLE 305.4.1.3 HEAT CAPACITY OF SOLID WOOD SECTION 306 INFILTRATION
68	CHAPTER 4 STRUCTURAL PROVISIONS SECTION 401 GENERAL SECTION 402 PRESCRIPTIVE PROVISIONS SECTION 403 ENGINEERED PROVISIONS
69	TABLE 403.1 MAXIMUM DIAPHRAGM ASPECT RATIOS (HORIZONTAL OR SLOPED DIAPHRAGMS) SECTION 404 CONNECTIONS
70	SECTION 405 FLOOR SYSTEMS SECTION 406 LOG WALLS
71	SECTION 407 ROOF SYSTEMS
72	CHAPTER 5 REFERENCED STANDARDS AWC ASME ASTM
73	ICC UL
74	INTRODUCING THE ICC ASSESSMENT CENTER, FEATURING PRONTO™
75	ICC PLAN REVIEW SERVICES
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