In the early days of housing construction roofs where flat, this is because of the cheap old building methods.
After a few years of completion of these flat roofs many of them began to collapse and break.
This was due to the natural environment, with rain being the main problem; they also collapsed due to general wear and tear, from the environment.
Factors of roof construction is considered a lot a more nowadays, and different roofing methods are made to last.
The main factors (in the west) for a roof is to protect your from rain, cold and hot weather, and also the wind.
Because of this many houses roofs are made from timber as it is a strong, and keeps out the weather.
The best way to construct your roof is to use a reinforced timber structure, like a timber roof truss.
This is a structure which is designed to fit your house and fits securely on top of your house.
A truss can be made to fit any type of house, even an unusual roof truss design can be used.
A truss is more energy efficient than other roofing methods, as most companies which will make your truss, then will build the truss, then deliver them when they are needed to complete the house.
A timber roof truss is the foundation of the roof in which the roofing material is put upon.
With its structurally strong shape and timber strength once completed a timber roof truss will offer your home protection and a strong structure, which will have no chances of collapsing.
A timber roof truss is made from strength graded timbers joined through steal nail plates.