Hair line crack (usually vertical)
Cause
a) Poor workmanship - cement too dry (contraction causes the crack)
b) Laying of bricks without netting in between the bricks
Solution
Plastering
Horizontal line crack (usually bigger crack - can see deeper inside)
** Serious & Dangerous problem! May cause wall to collapse
Cause
a) Poor workmanship
Solution
a) Plastering + reenforce with rod iron
b) Demolish & rebuild
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