ABSTRACT
Roofs with slopes greater than 10° are classed as pitched roofs. Roofs can be designed in many different forms and in combinations of these forms. Primary functions of any roof are to: provide an adequate barrier to the penetration of the elements. Trussed rafter production is assembled under factory quality controlled conditions from uniformly planed structural grade timber. Truss plates are pressure rolled or pressed into place by hydraulic ram in the process of truss assembly. Gambrel roofs are double pitched with a break in the roof slope. Gambrels are useful in providing more attic headroom and frequently incorporate dormers and rooflights. They have a variety of constructional forms. Sprockets may be provided at the eaves to reduce the slope of a pitched roof. Sprockets are generally most suitable for use on wide, steeply pitched roofs to: enhance the roof profile by creating a feature.
