Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction.
Roof framing structural design.
All roof framing tables are organized by maximum snow load.
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.
With premanufactured trusses or with rafters and ceiling joists commonly called stick framing.
It s a more complex design that requires more building materials.
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.
Parts of both the walls and the roof.
It s steep pointed roof which extends all the way to the ground or close to the ground.
For high wind areas or strong storms a pitch of 4 12 6 12 18 5 26 5 angle is recommended.
But before discussing roof framing we will first review.
Wood truss roof framing is now used in most new homes because it is generally more efficient than older stick framing methods.
1 10d nails having penetration into framing of more than 11 2 inches and 2 nails are spaced 3 inches o c.
There are two common ways of framing the roof of a house.
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.
Hip roofs are more expensive to build than a gable roof.
Another example is plywood structural sheathing panels that entered the market in the 1950s and quickly replaced board sheathing on walls floors and roofs.
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 a very simple roof design and is inexpensive because the roof serves as both roof and walls.
Hip roofs can offer extra living space with an addition of a dormer or a crow s nest.
Building a hip roof requires proper attention towards some major factors such as measurements framing and rafter adjustment.
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.
The roof makes up much or all off the walls of the home.
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.
