The majority of roofs seen in Australian architecture, both traditional and modern are pitched. The angle of pitching can vary house by house, and era by era but they are usually sloped at an angle of 26 degrees or more. The reason for this, is that pitching a roof increases the surface area, and ability for rain to run off in storms and be collected into guttering and downpipe systems for recycling or elimination in storm water drains. The purpose a roof is to quickly divert water away, to minimise the risk of leaks or damage inside the house.
Most roofs, especially modern roofs are built within a set of building codes that mandates the types of materials that can be used, any mandatory roof features as well as architectural and construction guidelines. These guidelines help to ensure that every home that is built in Australia meets a minimum standard and is adding to the quality residential infrastructure that our country is built on.