Roof Rafter And Ceiling Joist Framing Section

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Roof rafter and ceiling joist framing section.

2x4 connected to each rafter if no rafter tie ridge to be supported by engineered wall or girder. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule. Where ceiling joists or rafter ties are not provided. Understanding the difference between them is essential for those working in the construction trades while basic knowledge is useful for homeowners if repair and maintenance issues arise.

Joists and rafters are components used in the construction of buildings. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat. Wood and wood based products used for load supporting purposes shall conform to the applicable provisions of this section. Roof ceiling framing rafter exterior wall nailed to rafter ceiling joists parallel to rafters 2006 irc r802 3 1 joist or rafter tie which must be min.

Where joists are located above the top of the wall the joists have to be nailed. Where ceiling joists. Section r802 wood roof framing. 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.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Meeting current irc roof framing requirements means builders are really constructing very simple triangles using the rafters and ceiling joists because triangles are known to be the most stable shape. 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 when such joists are parallel to the rafters. Ceiling joists shall be continuous or securely joined where they meet over interior partitions and fastened to adjacent rafters in accordance with tables 2308 10 4 1 and 2304 9 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 11 2 inches 38 mm on the top plate at each end. In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together.