Why shouldn't the roof of the house be triangular?

Roof with drainage gradient greater than 10% is called sloping roof or sloping roof. 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. Formwork sloping roofs are widely used in buildings, mainly including single slope, double slope, four slope and folding type. Double slope type (see figure) and four slope type are more commonly 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.

An important aspect of a house depends on the shape, collocation and material of the roof. Many modern real estate developers have designed many houses called South America or Spain in order to win by surprise and be unconventional. These houses are famous for their novelty and are favored by many buyers. In fact, the house with exotic design has both advantages and disadvantages in terms of its deformed roof. If it goes against tradition and national conditions, it is too extreme. Traditionally, such a house is considered unlucky, and even people who live under such eaves for a long time are prone to death or mental illness.

The triangular roof with large slope is easy to make the air inside and outside the house abnormal; The roof with high middle and low sides is called "cold shoulder", which looks lonely on the outside. Traditional geomantic omen holds that continuous peaks are full of vitality, while steep peaks, especially those in the shape of "mountain", have high peaks in the middle and low peaks on both sides, just like the "fire" triangle in the five elements.

Judging from the actual situation, water is flowing downwards. On the uneven roof with high middle and low sides, the speed of rain will be accelerated, the water hammer will be increased, and the building materials will be perishable, which will adversely affect the joints of the roof.