Roof Framing Structural Design

Wood truss roof framing is now used in most new homes because it is generally more efficient than older stick framing methods.

Roof framing structural design.

But before discussing roof framing we will first review. Hip roofs are more expensive to build than a gable roof. For high wind areas or strong storms a pitch of 4 12 6 12 18 5 26 5 angle is recommended. Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction.

While truss roofs are the most popular construction style today by some estimates truss roofs outnumber stick frame roofs two to one there are regions of the country where builders still prefer stick frame roofing. 8d is recommended minimum for roofs due to negative pressures of high winds. 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 a frame is very easy to identify. Definition of structural ridge or ridge beam used in roof framing. It s a very simple roof design and is inexpensive because the roof serves as both roof and walls. 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.

The structural relationship between the rafters and the wall is the same in all types of roofs. It s steep pointed roof which extends all the way to the ground or close to the ground. 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. Hip roofs can offer extra living space with an addition of a dormer or a crow s nest.

A structural ridge beam is a horizontal beam placed at the peak or ridge of a roof and is designed to carry much of the live and dead loads or weight of the roof structure by itself. There are two common ways of framing the roof of a house. All roof framing tables are organized by maximum snow load. The roof makes up much or all off the walls of the home.

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. 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. Parts of both the walls and the roof. With premanufactured trusses or with rafters and ceiling joists commonly called stick framing.