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R802.3.1 Ceiling Joist and Rafter Connections

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.3 Framing Details > R802.3.1 Ceiling Joist and Rafter Connections

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Ceiling joists and rafters shall be nailed to each other in accordance with Table R802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table R602.3(1). Ceiling joists shall be continuous or securely joined in accordance with Table R802.5.1(9) where they meet over interior partitions and are nailed to adjacent rafters to provide a continuous tie across the building where such joists are parallel to the rafters.

Where ceiling joists are not connected to the rafters at the top wall plate, joists connected higher in the attic shall be installed as rafter ties, or rafter ties shall be installed to provide a continuous tie. Where ceiling joists are not parallel to rafters, rafter ties shall be installed. Rafter ties shall be not less than 2 inches by 4 inches (51 mm by 102 mm) (nominal), installed in accordance with the connection requirements in Table R802.5.1(9), or connections of equivalent capacities shall be provided. Where ceiling joists or rafter ties are not provided, the ridge formed by these rafters shall be supported by a wall or girder designed in accordance with accepted engineering practice.

Collar ties or ridge straps to resist wind uplift shall be connected in the upper third of the attic space in accordance with Table R602.3(1).

Collar ties shall be not less than 1 inch by 4 inches (25 mm by 102 mm) (nominal), spaced not more than 4 feet (1219 mm) on center.

Related Code Sections

2308.7.3.1 Wood, Ceiling Joist and Rafter Connections

Ceiling joists and rafters shall be nailed to each other and the assembly shall be nailed to the top wall plate in accordance with Tables 2304.10.1 and 2308.7.5. Ceiling joists shall be continuous or securely joined where they meet over interior partitions and be fastened to adjacent rafters in accordance with Tables 2304.10.1 and 2308.7.3.1 to provide a continuous rafter tie across the building where such joists are parallel to the rafters. Ceiling joists shall have a bearing surface of not less than 1 1 / 2 inches (38 mm) on the top plate at each end. Where ceiling joists are not parallel to rafters, an equivalent rafter tie shall be installed in a manner to provide a continuous tie across the building, at a spacing of not more than 4 feet (1219 mm) on center. The connections shall ...

Building Code 2015 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.7 Roof and Ceiling Framing > 2308.7.3 Ceiling Joist and Rafter Framing > 2308.7.3.1 Ceiling Joist and Rafter Connections

R802.3.1 Roof-Ceiling Construction, Ceiling Joist and Rafter Connections

Ceiling joists and rafters shall be nailed to each other in accordance with Table R802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table R602.3(1). Ceiling joists shall be continuous or securely joined in accordance with Table R802.5.1(9) where they meet over interior partitions and are nailed to adjacent rafters to provide a continuous tie across the building where such joists are parallel to the rafters. Where ceiling joists are not connected ...

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.3 Framing Details > R802.3.1 Ceiling Joist and Rafter Connections

R804.3.2.4 Roof-Ceiling Construction, Roof Rafter to Ceiling Joist and Ridge Member Connection

Roof rafters shall be connected to a parallel ceiling joist to form a continuous tie between exterior walls in accordance with Figure R804.3.1.1 and Table R804.3.1.1(3). Ceiling joists shall be connected to the top track of the load-bearing wall in accordance with Table R804.3, either with the required number of No. 10 screws applied through the flange of the ceiling joist or by using a 54-mil (1.37 mm) clip angle with the required number of No.10 screws in each leg. Roof rafters shall ...

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R804 Cold-Formed Steel Roof Framing > R804.3 Roof Construction > R804.3.2 Roof Rafters > R804.3.2.4 Roof Rafter to Ceiling Joist and Ridge Member Connection

R804.3.1.1 Roof-Ceiling Construction, Minimum Ceiling Joist Size

Ceiling joist size and thickness shall be determined in accordance with the limits set forth in Tables R804.3.1.1(1) and R804.3.1.1(2). When determining the size of ceiling joists, the lateral support of the top flange shall be classified as unbraced, braced at midspan or braced at third points in accordance with Section R804.3.1.3. Where sheathing material is attached to the top flange of ceiling joists or where the bracing is spaced closer than third point of the joists, the "third point" values from Tables R804.3.1.1(1) and R804.3.1.1(2) shall be used. Ceiling joists shall have a bearing support length of not less than 1 1 / 2 inches (38 mm) and shall be connected to roof rafters (heel ...

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R804 Cold-Formed Steel Roof Framing > R804.3 Roof Construction > R804.3.1 Ceiling Joists > R804.3.1.1 Minimum Ceiling Joist Size

R802.5 Roof-Ceiling Construction, Allowable Rafter Spans

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. Where ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the following factors: H C / H R Rafter Span Adjustment Factor 1/3 0.67 1/4 0.76 1/5 0.83 1/6 0.90 1/7.5 or less 1.00 where: H C = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. H R = Height of roof ridge measured vertically above the top of the rafter support walls. TABLE R802.5.1(9) RAFTER/CEILING JOIST HEEL JOINT CONNECTIONS ...

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.5 Allowable Rafter Spans

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