Roof framing in this chapter we will introduce you to the fundamentals of roof design and construction.

Timber roof structure elements. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. To achieve this is a simple frame called a ladder frame is constructed. Finishes for flat roofs are also more limited. Roof trusses can be said to be the skeleton of the roof as you known the skeleton produce the shape of animals even humans.

This frame consists of the last two rafters joined together by means of. But before discussing roof framing we will first review some basic terms and definitions used in roof construction. Safety on site using timber engineered components floor trusses wall frames and roof trusses etc. Rafters have a tendency to flatten under gravity thrusting outwards on the walls.

For homebuilders a timber frame for a flat roof is usually the cheapest option and the easiest to build. The roof shown on the right is the same in principle although there is an additional timber known as a purlin which prevents the rafters from sagging mid span. There are two basic components of a timber roof. A truss is a piece of framework using triangular shapes.

The space between each truss is known as a bay. Roof structures roofs 12section module 3 sheet 10 verge details and ladder frame the construction of the verge of a gable roof is shown below. Pairs of opposing rafters were thus initially tied together by a horizontal tie. The roof also depend on its trusses for it shape.

Roof trusses are generally fabricated offsite reducing price and speeding up the construction of your roof frame. It supports the roof load and helps transfer it down load bearing walls and into the foundations. The purlin is supported by the gable end walls party walls in mid terraced houses and is sometimes strutted from an internal loadbearing wall and sometimes the gable walls to a provide additional support. But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.

Roofing is one of the most important project to undergo while constructing a house. Timber trusses generally cheaper than steel trusses wooden trusses don t last as long because timber being a natural material cannot stand up to the elements as well as steel. For larger spans and thinner walls this can topple the walls. The roof extends over the gable wall to give a suitable overhang.

Timber trusses are exposed to warping and bowing problems which can cause structural damage to the rest of the building. The supporting structure and the covering. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. Are designed to be part of a structural system that includes the battens bracing trusses binders ceiling supporting structure and the connection of these elements.

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