Which combination of factors is most likely to result in cracks due to shrinkage in plaster?
Application of thick coat and rapid drying
Shrinkage cracks in plaster result from:
- Thick coat: More mortar volume undergoes greater volumetric shrinkage during drying
- Rapid drying: If water evaporates too quickly (hot/dry weather, direct sun, strong wind), the surface dries and shrinks before the inner layers, causing differential shrinkage and cracking
Thin coats shrink less in absolute terms. Slow drying (moist conditions, curing) allows gradual uniform shrinkage without cracking. The combination of thick coat + rapid drying creates the maximum risk of shrinkage cracks.
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