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Hello, Apple decoration answers your questions and recommends installing sill stones.

The purpose of the threshold stone is twofold:

1. When the materials used on the floor of two spaces (e.g. rooms) are of different textures, especially when the two materials cannot be closed to each other. Use the sill stone to close (intersect) the two materials separately. This kind of intersection is widely used in many places and many types of work in construction.

For example, when you talk about the kitchen and the outside room, because most of the kitchens are made of floor tiles, the other rooms are not necessarily floor tiles, but may be floors; When the floor tiles are laid to the door, they are often not whole numbers (modulus); Assuming that the floor is also perpendicular to the door, placing a strip of stone between the two can cover both the joints of the floor tiles and the joints of the floor. There is an overrun between the two materials. Jargon:

It's a circle". Second, the other situation is that there is a small difference in the height of the ground in the two spaces (height difference), such as one or two centimeters, if the comprehensive adjustment feels labor-intensive and costly. In the construction, the "threshold stone" can also be used to solve and overcome. It is important to note that:

In this case, the sill stone used, near the lower side of the ground, needs to be "chamfered", which can be beveled or rounded.