What condition is indicated by trapped moisture between the plies of roll roofing?

Trapped moisture between the plies of roll roofing leads to a condition known as blistering. Blistering occurs when moisture accumulates and vaporizes due to heat, creating pockets of air or moisture under the surface. As the roofing material heats up, the pressure from the vapor expands these pockets, resulting in blisters forming on the top layer of the roofing. This can compromise the integrity of the roof over time, leading to further issues such as leaks or deterioration.

Delamination typically refers to the separation of layers within a material but is not specifically caused by moisture between plies in the context of roofing. Cracking involves the formation of fissures or breaks in the material, which can happen for various reasons, but isn't directly linked to trapped moisture between plies. Warping is a deformation of the material, which can stem from moisture but is not a condition specifically defined by moisture trapped during roofing installation.