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Why are the left and right doorposts of the house not suitable for grafting or foundation

Modern doors are simpler and have no roof. The doorposts are made of wood, brick, stone, concrete, iron posts, etc. as materials. In order to ensure the straightness and firmness of the doorpost, the following points should be paid attention to:

(1) If wood is used as the material for the doorpost, the wood should be carefully selected, and the part buried in the ground should be smoked and burnt to prevent corrosion.

(2) If concrete is used, tiles are usually attached.

The iron door has simple installation and strong durability, but it is easy to rust and must be painted with anti-rust paint.

(4) The door door can be designed as single door, double door, left and right opening, etc. due to the size relationship.

(5) The gate posts cannot be constructed in a contiguous way.

The ancient Xiangzhai family said: "The left and right doorposts at the door of the house must not be built by grafting or foundation." In the past, because the roots of the doorposts were deeply buried in the ground, they were easy to rot, so foundations (columns) often occurred. The problem. The doorposts completed by the foundation method cannot withstand the pressure of the roof and the weight of the door panels. Therefore, what the patriarch said, even from the perspective of modern architecture, is reasonable.