Page 168 - 2018_IRC

FLOORS

trimmer joist bearing. Where the header joist span exceeds 4 requirements specified in the construction documents for
feet (1219 mm), the trimmer joists and the header joist shall the building and on the individual truss design drawings. In
be doubled and of sufficient cross section to support the floor the absence of specific bracing requirements, trusses shall
joists framing into the header. be braced in accordance with accepted industry practices,
R502.11 Wood trusses. such as, the SBCA Building Component Safety Information
(BCSI) Guide to Good Practice for Handling, Installing &
R502.11.1 Design. Wood trusses shall be designed in Bracing of Metal Plate Connected Wood Trusses.
accordance with approved engineering practice. The design
and manufacture of metal-plate-connected wood trusses R502.11.3 Alterations to trusses. Truss members and
shall comply with ANSI/TPI 1. The truss design drawings components shall not be cut, notched, spliced or otherwise
shall be prepared by a registered professional where altered in any way without the approval of a registered
required by the statutes of the jurisdiction in which the proj- design professional. Alterations resulting in the addition
ect is to be constructed in accordance with Section R106.1. of load that exceeds the design load for the truss, shall not
be permitted without verification that the truss is capable
R502.11.2 Bracing. Trusses shall be braced to prevent of supporting the additional loading.
rotation and provide lateral stability in accordance with the

L
L/3 L/3
D/3 MAX.

NO NOTCHES D
D/6 MAX. PERMITTED D/3 MAX.
D/6 MAX. FOR
MEMBERS
LESS THAN
4 IN. NOMINAL
DIMENSION
FLOOR JOIST— CENTER CUTS

D/4 MAX.

D

D/4 MAX.

FLOOR JOIST— END CUTS

D/3 MAX.

2 IN. MIN. FROM TOP
AND BOTTOM OF JOIST
D (ACTUAL DEPTH)
For SI: 1 inch = 25.4 mm.
FIGURE R502.8
CUTTING, NOTCHING AND DRILLING

2018 INTERNATIONAL RESIDENTIAL CODE ® 143
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.