How can we repair cracks in concrete roofs?
The important thing to know about cracks present on concrete slab is their nature. As we all know that on variation of temperature, RCC slab get expand and contract which is called thermal expansion and contraction. On rise of temperature it expands and on fall it contracts. These variations will reflect on the cracks too and there will be a movement on cracks.So, anything which is to be applied on the cracks must be flexible enough to accommodate the movements.Two types of treatment can be usedPU(Polyurethane) sealant treatment- In this treatment, after cleaning of surface, slight V-groove cut has to be made on cracks. Again cleaning and application of PU sealant is to be done.just put some sealant on your finger and fill it on V-groove cut carefully.Flexible acrylic tape-This treatment is little tricky but you can do it with some effortsReason behind application of masking tape-we want to prevent acrylic tape to be completely stick to the crack.This technique makes acrylic tape independent from the movement of the crack.any adverse effect of movement of crack will not reflect on acrylic tape.