A failure pattern characterized by irregular, intersecting fissures on the surface of a fluid-applied membrane, coating, or sealant. It occurs when a material shrinks too rapidly during the curing process, often because it was applied too thick or exposed to excessive heat and wind. The cracks can penetrate deep enough to allow water infiltration and usually require the material to be removed and reapplied.
The detail coat on the plaza deck is mud cracking because the guys put it down way past the maximum mil thickness.
Do not mix it up with
- Alligatoring: Alligatoring is a surface degradation from UV exposure over time, while mud cracking happens during the initial cure due to shrinkage.
Related terms
Alligatoring
A pattern of surface cracks on aged sealant or asphalt that looks like alligator skin.
Fluid-applied membrane
A liquid waterproofing applied by roller, squeegee or spray that cures into a continuous rubbery film with no laps.
Drying time
The period required for a wet-applied material to lose its volatile components and resist weather damage.