Gaps and cracks in building structures are a common occurrence. These types of damages occur as commonly in brick structures as in concrete (reinforced concrete, compressed concrete constructions). One of the most commonly used methods to survey if a given fissure or crack volumetrically “shifts” with time, is the so-called “glass method”. This method is held as a cure-all for all structural damage. The brittleness of glass makes even the slightest change in fissure width (less than 0.1 mm) result in the breaking up of the “measurement instrument”. From an engineering point of view, these deformations are most often virtually harmless for brick and concrete structures. Additionally, fissured glass exerts a very unfavorable impression on the owner or tenant of the building, in whose mind such a sight gets associated solely with progressive structural decay.
The installation is very easy and shown on the below photos.