What is Crazing Crack in Plaster?

Crazing is a system of fine splits, normally in a hexagonal pattern, which measures somewhere in the range of 5 and 75 mm over every hexagon. They are typically exceptionally fine and shallow and don’t reach out through the whole depth of the plaster. They are generally the consequence of over trowelling a rich blend (one with a high cement content) or utilizing sand containing an inordinate measure of dust (over 15% by mass passing a 0,075 mm sieve). Crazing regularly happens inside a couple of hours of the mortar is applied to the divider and breaks may barely be obvious until residue or dampness makes them observable. Craze cracks are of little significance, don’t open and close with time, and can be covered using any quality paint. On the off chance, glass fiber tissue can be applied during the painting activity.

Preventions

1. Make sure that sand to be used does not contain silt or finer particles passing through 75micron. For river sand, should not be more than 8% by vol. and for manufactured sand, should not be more than 5%.
2. Skilled workers should only do this work for better workability and handling.
3. Never sprinkle dry cement on plaster.
4. The base to where the plaster is to be applied should be wet properly. If it left dry, it will soak out moisture from the plaster.