Page 448 - 2018_IRC

ROOF-CEILING CONSTRUCTION

R804.3.2.3 Roof rafter splice. Roof rafters shall not be Figure R804.3.2.4. The ridge member shall extend the
spliced. full depth of the sloped roof rafter cut.
R804.3.2.5 Roof rafter bottom flange bracing. The
R804.3.2.4 Roof rafter to ceiling joist and ridge mem- bottom flanges of roof rafters shall be continuously
ber connection. Roof rafters shall be connected to a par- braced, at a maximum spacing of 8 feet (2440 mm) as
allel ceiling joist to form a continuous tie between measured parallel to the roof rafters, with one of the
exterior walls in accordance with Figure R804.3.1.1 and following members:
Table R804.3.1.1(3). Ceiling joists shall be connected to 1. Minimum 33-mil (0.84 mm) C-shaped member.
the top track of the load-bearing wall in accordance with
Table R804.3, either with the required number of No. 10 2. Minimum 33-mil (0.84 mm) track section.
screws applied through the flange of the ceiling joist or 3. Minimum 1 / -inch by 33-mil (38 mm by 0.84
1
2
by using a 54-mil (1.37 mm) clip angle with the required mm) steel strap.
number of No.10 screws in each leg. Roof rafters shall The bracing element shall be fastened to the bottom flange
be connected to a ridge member with a minimum 2-inch of each roof rafter with one No. 8 screw and shall be fas-
by 2-inch (51 mm by 51 mm) clip angle fastened with tened to blocking with two No. 8 screws. Blocking shall
No. 10 screws to the ridge member in accordance with be installed between roof rafters in-line with the continu-
Figure R804.3.2.4 and Table R804.3.2.4. The clip angle ous bracing at a maximum spacing of 12 feet (3658 mm)
shall have a steel thickness equivalent to or greater than measured perpendicular to the roof rafters. The ends of
the roof rafter thickness and shall extend the depth of the continuous bracing shall be fastened to blocking or
roof rafter member to the extent possible. The ridge anchored to a stable building component with two No. 8
member shall be fabricated from a C-shaped member screws.
and a track section that shall have a minimum size and R804.3.3 Cutting and notching. Flanges and lips of load-
steel thickness equivalent to or greater than that of adja- bearing, cold-formed steel roof framing members shall not
cent roof rafters and shall be installed in accordance with be cut or notched.

CLIP ANGLE NO. 10 SCREWS IN EACH
LEG OF CLIP ANGLE

RAFTER
(TYP.)

HIP MEMBER OR RIDGE
MEMBER: C-SHAPE INSIDE
A TRACK SECTION FASTENED
WITH NO. 10 SCREWS AT 24 IN.
O.C. THROUGH TOP AND
BOTTOM FLANGES
For SI: 1 inch = 25.4 mm.
FIGURE R804.3.2.4
RIDGE MEMBER CONNECTION
TABLE R804.3.2.4
SCREWS REQUIRED AT EACH LEG OF CLIP ANGLE FOR ROOF RAFTER TO RIDGE MEMBER CONNECTION a
NUMBER OF SCREWS
BUILDING WIDTH (feet) Ground snow load (psf)
0 to 20 21 to 30 31 to 50 51 to 70
2 4 2 2 3 4
2 8 2 3 4 5
3 2 2 3 4 5
3 6 3 3 5 6
4 0 3 4 5 7
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
a. Screws shall be No. 10 minimum.

2018 INTERNATIONAL RESIDENTIAL CODE ® 423
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