Roof Framing Structural Design

Initially we will discuss the framing of gable roofs so that we can learn the basics of how to size a roof rafter beam or joist.

Roof framing structural design.

But before discussing roof framing we will first review. All roof framing tables are organized by maximum snow load. Hip roofs are more expensive to build than a gable roof. 8d is recommended minimum for roofs due to negative pressures of high winds.

The a frame is very easy to identify. Parts of both the walls and the roof. For high wind areas or strong storms a pitch of 4 12 6 12 18 5 26 5 angle is recommended. Framing at adjoining panel edges shall be 3 inches nominal or wider and nails shall be staggered where both of the following conditions are met.

The roof makes up much or all off the walls of the home. It s steep pointed roof which extends all the way to the ground or close to the ground. In most regions the first thing to consider before sizing the wood framing members for a roof is the maximum snow load that the roof will have to bear. There are two common ways of framing the roof of a house.

Another example is plywood structural sheathing panels that entered the market in the 1950s and quickly replaced board sheathing on walls floors and roofs. Wood truss roof framing is now used in most new homes because it is generally more efficient than older stick framing methods. It s a very simple roof design and is inexpensive because the roof serves as both roof and walls. With premanufactured trusses or with rafters and ceiling joists commonly called stick framing.

Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction. 1 10d nails having penetration into framing of more than 11 2 inches and 2 nails are spaced 3 inches o c. It s a more complex design that requires more building materials. The structural relationship between the rafters and the wall is the same in all types of roofs.

Framing a hip roof thus demands expertise in this field so that the completed structure can be designed with more accuracy and safety of the house. Roof snow drift surcharge a n g l e note a 15 increase in the allowable capacity of wood for loads that include snow which is a short term load snow loads 7 12 cs 0 99 slope 8 12 0 91 9 12 0 83 10 12 0 75 11 12 0 69 12 12 0 63 note that roofs exceeding an angle of 30 degrees may reduce the ground snow load. Building a hip roof requires proper attention towards some major factors such as measurements framing and rafter adjustment. Definition of structural ridge or ridge beam used in roof framing.