A stucco surface, made of Portland cement and sand mix, shrinks on gaining strength, introducing tensile stress in it. Therefore, when stucco is applied on a (wood or steel) stud wall, it is reinforced with metal lath. Despite the lath reinforcement, a stucco wall requires control (shrinkage) joints. Why?
What will be an ideal response?
Lath reinforcement does not prevent stucco from cracking. The total crack width in a certain area of a stucco
remains the same whether it is reinforced or unreinforced. The reinforcement only converts few wide cracks into a
larger number of narrow-width cracks. Because stucco reinforcement does not eliminate cracks, control joints are
needed in a stucco wall.
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