When building a house, why should the roof be triangular?

The triangle has stability, which can make the roof not fall easily.

The form and slope of sloping roof mainly depend on building plane, structural form, roofing material, climate environment, customs and architectural modeling and other factors.

Inclined roofs are widely used in buildings, mainly including single slope, double slope, four slope and folding type. Double slope and four slope are widely used. The gable protruding from the top of the double-slope roof is called hanging mountain; A gable with a flat roof is called a hard mountain. The four corners of the traditional four slopes in China are inclined, which is called the Temple of Heaven. The main ridge extends and two mountain flower faces are formed on both sides, which is called inclined mountain.

Extended data

The roofs of ancient buildings in China can be divided into the following forms: Ding Dian, inclined roof, suspended roof, hard roof, pyramid roof, Ding Dian, etc. Among them, Yunnan, Xie and pyramid roofs can be divided into single eaves (one roof) and double eaves (two or more eaves), and Xie, hanging and hard can be derived into rolled shed roofs. The roof of an ancient building is not only functional, but also a symbol of rank.

Its rank order is: double-eaved roof > double-eaved pyramid roof > single-eaved Ding Dian > single-eaved pyramid roof > hanging from the top of the mountain > hard peak > Wan Ding. Besides the above roofs, there are also fan-shaped roofs, swastika roofs, helmet roofs, hook-shaped roofs, cross-shaped roofs, dome roofs, circular roofs, flat roofs, single-slope roofs and grey-backed roofs.

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