Roof Framing Design

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.

Roof framing design.

Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction. A distinction is made between single shell and double shell roofs. The a frame is very easy to identify. Definition of structural ridge or ridge beam used in roof framing 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.

The roof frame work mainly consists of purlins inferior purlin central purlin and ridge purlin ridge collar rafter and roofing battens. 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. Plywood or osb is the most common materials used for the roof sheathing.

The structure of the roof roof structure and roofing the roof structure is also called roof frame work and typically consists of wood. Roofs are basically five types. Another common design in the northeast is the saltbox which is a gable roof with one longer side. The roof makes up much or all off the walls of the home.

There are two common ways of framing the roof of a house. Partially these will depend on the style of roof you ve selected but you ll also have some wiggle room depending on the design elements of the house. We will then discuss the framing square and learn how it s used to solve some basic construction problems. Roof framing depends on the type of roof you want to build.

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. Framers stick building a hip roof you can learn a great deal about roof framing by understanding the concepts of framing a gable or shed roof. The gable roof hip roof gambrel roof flat roof shed roof mansard roof and many more custom roof types. But before discussing roof framing we will first review some basic terms and definitions used in roof construction.

The pitch of the roof determines the roofing material you can use. Asphalt shingle can be installed on a pitch of 2 over 12 or greater. All roof framing tables are organized by maximum snow load. Shed gable hip gambrel and mansard.

It s steep pointed roof which extends all the way to the ground or close to the ground. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult.