These types of cracks are often straight vertical or horizontal lines, or in stepped diagonal lines. The cracks go through the plaster and are generally wider than 0.5mm.
Possible Causes
This can be the cause of differential movement of the foundations, moisture expansion or drying shrinkage of masonry units, or thermal movement of the roof.
How Can I Fix This Problem
Because these cracks originate in the wall and not in the plaster, repairing the plaster is ineffective. A specialist is required to establish the cause and recommend remedial measures.
Such measures may include structural alterations which change craks into movement joints. Visable joints can be hidden by coverstrips fixed one side of the joint or sealed with elastometric sealants
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Duracoat Smotex
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