Measuring internal angle
In order to ensure that the internal angle is straight, we need to play ink lines on both sides when measuring the internal angle and pull out 5 meters for inspection. If the length is less than 5 meters, you need to use the through line for inspection. The straightness of the inner angle should be controlled within 3 mm
Square degree of yang angle
The verticality of the external angle needs to reach 0 error. No matter where it is, it needs to be improved.
Looking for yin-supplementing angle
Some walls have a large deviation in the internal angle. If you simply make a straight line for repair, it may cause the wall to become too thick, thus causing problems such as hollowing and falling off. In order to avoid this situation, the inner angle should be checked first. If the deviation is large, first find out the high place and knock it off, and then straighten the elastic line to ensure that the inner angle is close to 90 degrees.
Use a right-angle measuring ruler
In order to detect the deviation of yin-yang angle conveniently, a multifunctional internal and external right-angle measuring ruler can be used. Generally speaking, the deviation of ordinary plastered wall surface is 4mm, while the deviation of brick surface is 2 mm.