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R804.3.3 Hip Framing

Residential Code 2012 of South Holland > 8 Roof-Ceiling Construction > R804 Steel Roof Framing > R804.3 Roof Construction > R804.3.3 Hip Framing

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Hip framing shall consist of jack-rafters, hip members, hip support columns and connections in accordance with this section, or shall be in accordance with an approved design. The provisions of this section for hip members and hip support columns shall apply only where the jack rafter slope is greater than or equal to the roof slope. For the purposes of determining member sizes in this section, wind speeds shall be converted to equivalent ground snow load in accordance with Table R804.3.2.1(3).

R804.3.3.1 Jack Rafters

Jack rafters shall meet the requirements for roof rafters in accordance with Section R804.3.2, except that the requirements in Section R804.3.2.4 shall not apply.

R804.3.3.2 Hip Members

Hip members shall be fabricated from C-shape members and track section, which shall have minimum sizes determined in accordance with Table R804.3.3.2. The C-shape member and track section shall be connected at a maximum spacing of 24 inches (610 mm) using No. 10 screws through top and bottom flanges in accordance with Figure R804.3.2.4. The depth of the hip member shall match that of the roof rafters and jack rafters, or shall be based on an approved design for a beam pocket at the corner of the supporting wall.

TABLE R804.3.3.2
HIP MEMBER SIZES, 33 ksi STEEL
BUILDING WIDTH (feet)	HIP MEMBER DESIGNATION^a
	Equivalent ground snow load (psf)
	0 to 20	21 to 30	31 to 50	51 to 70
24	800S162-68	800S162-68	800S162-97	1000S162-97
24	800T150-68	800T150-68	800T150-97	1000T150-97
28	1000S162-68	1000S162-68	1000S162-97	1200S162-97
28	1000T150-68	1000T150-68	1000T150-97	1200T150-97
32	1000S162-97	1000S162-97	1200S162-97	—
32	1000T150-97	1000T150-97	1200T150-97
36	1200S162-97
36	1200T150-97	—	—	—
40	—	—	—	—

For SI: 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.

The web depth of the roof rafters and jack rafters is to match at the hip or they shall be installed in accordance with an approved design.

R804.3.3.3 Hip Support Columns

Hip support columns shall be used to support hip members at the ridge. A hip support column shall consist of a pair of C-shape members, with a minimum size determined in accordance with Table R804.3.3.3. The C-shape members shall be connected at a maximum spacing of 24 inches (610 mm) on center to form a box using minimum 3-inch by 33-mil (76 mm by 0.84 mm) strap connected to each of the flanges of the C-shape members with three-No. 10 screws. Hip support columns shall have a continuous load path to the foundation and shall be supported at the ceiling line by an interior wall or by an approved design for a supporting element.

TABLE R804.3.3.3
HIP SUPPORT COLUMN SIZES
BUILDING WIDTH (feet)	HIP SUPPORT COLUMN DESIGNATION^{a, b}
	Equivalent ground snow load (psf)
	0 to 20	21 to 30	31 to 50	51 to 70
24	2-350S162-33	2-350S162-33	2-350S162-43	2-350S162-54
28	2-350S162-54	2-550S162-54	2-550S162-68	2-550S162-68
32	2-550S162-68	2-550S162-68	2-550S162-97	—
36	2-550S162-97	—	—	—
40	—	—	—	—

For SI: 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.

Box shape column only in accordance with Figure R804.3.3.4(2).
33-ksi steel for 33- and 43-mil material; 50-ksi steel for thicker material.

R804.3.3.4 Hip Framing Connections

Hip rafter framing connections shall be installed in accordance with the following:

Jack rafters shall be connected at the eave to a parallel C-shape blocking member in accordance with Figure R804.3.3.4(1). The C-shape blocking member shall be attached to the supporting wall track with minimum two No. 10 screws.
Jack rafters shall be connected to a hip member with a minimum 2-inch by 2-inch (51 mm by 51 mm) clip angle fastened with No.10 screws to the hip member in accordance with Figure R804.3.2.4 and Table R804.3.2.4. The clip angle shall have a steel thickness equivalent to or greater than the jack rafter thickness and shall extend the depth of the jack rafter member to the extent possible.
The connection of the hip support columns at the ceiling line shall be in accordance with Figure R804.3.3.4(2), with an uplift strap sized in accordance with Table R804.3.3.4(1).
The connection of hip support members, ridge members and hip support columns at the ridge shall be in accordance with Figures R804.3.3.4(3) and R804.3.3.4(4) and Table R804.3.3.4(2).
The connection of hip members to the wall corner shall be in accordance with Figure R804.3.3.4(5) and Table R804.3.3.4(3).

TABLE R804.3.3.4(1)
UPLIFT STRAP CONNECTION REQUIREMENTS HIP SUPPORT COLUMN AT CEILING LINE
BUILDING WIDTH (feet)	BASIC WIND SPEED (mph) EXPOSURE B
	85	100	110	—	—
	BASIC WIND SPEED (mph) EXPOSURE C
	—	85	—	100	110
	Number of No. 10 screws in each end of each 3-inch by 54-mil steel strap^{a, b, c}
24	3	4	4	6	7
28	4	6	6	8	10
32	5	8	8	11	13
36	7	10	11	14	17
40	—	—	—	—	—

For SI: 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 mil = 0.0254 mm.

Two straps are required, one each side of the column.
Space screws at ³/₄ inch on center and provide ³/₄-inch end distance.
50-ksi steel strap.

FIGURE R804.3.3.4(1)
JACK RAFTER CONNECTION AT EAVE

TABLE R804.3.3.4(2)
CONNECTION REQUIREMENTS HIP MEMBER TO HIP SUPPORT COLUMN
BUILDING WIDTH (feet)	NUMBER OF NO. 10 SCREWS IN EACH FRAMING ANGLE^{a, b, c}
	Equivalent ground snow load (psf)
	0 to 20	21 to 30	31 to 50	51 to 70
24	10	10	10	12
28	10	10	14	18
32	10	12	—	—
36	14	—	—	—
40	—	—	—	—

For SI: 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.

Screws to be divided equally between the connection to the hip member and the column. Refer to Figures R804.3.3.4(3) and R804.3.3.4(4).
The number of screws required in each framing angle is not to be less than shown in Table R804.3.3.4(1).
50-ksi steel from the framing angle.

For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm.

TABLE R804.3.3.4(3)
UPLIFT STRAP CONNECTION REQUIREMENTS HIP MEMBER TO WALL
BUILDING WIDTH (feet)	BASIC WIND SPEED (mph) EXPOSURE B
	85	100	110	—	—
	BASIC WIND SPEED (mph) EXPOSURE C
	—	85	—	100	110
	Number of No. 10 screws in each end of each 3-inch by 54-mil steel strap^{a, b, c}
24	2	2	3	3	4
28	2	3	3	4	5
32	3	4	4	6	7
36	3	5	5	7	8
40	—	—	—	—	—

For SI: 1 foot = 304.8 mm,1 pound per square foot = 0.0479 kPa.

Two straps are required, one each side of the column.
Space screws at ³/₄ inches on center and provide ³/₄-inch end distance.
50-ksi steel strap.

FIGURE R804.3.3.4(3)
HIP CONNECTIONS AT RIDGE

FIGURE R804.3.3.4(4)
HIP CONNECTIONS AT RIDGE AND BOX COLUMN

For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm.

FIGURE R804.3.3.4(5)
HIP MEMBER CONNECTION AT WALL CORNER

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