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.

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. Parts of both the walls and the roof. But before discussing roof framing we will first review.

All roof framing tables are organized by maximum snow load. Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction. Building a hip roof requires proper attention towards some major factors such as measurements framing and rafter adjustment. 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.

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. Definition of structural ridge or ridge beam used in roof framing. 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. 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.

8d is recommended minimum for roofs due to negative pressures of high winds. 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 a frame is very easy to identify. 1 10d nails having penetration into framing of more than 11 2 inches and 2 nails are spaced 3 inches o c.

With premanufactured trusses or with rafters and ceiling joists commonly called stick framing. 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. It s a very simple roof design and is inexpensive because the roof serves as both roof and walls. For high wind areas or strong storms a pitch of 4 12 6 12 18 5 26 5 angle is recommended.

Another example is plywood structural sheathing panels that entered the market in the 1950s and quickly replaced board sheathing on walls floors and roofs. There are two common ways of framing the roof of a house. The roof makes up much or all off the walls of the home. It s a more complex design that requires more building materials.