Differential moisture absorption due to loss of what can cause asphalt shingles to distort?

Differential moisture absorption in asphalt shingles can often be attributed to the loss of volatiles. Volatiles are components of the asphalt that evaporate when exposed to heat and sunlight, especially during the manufacturing and installation processes or over time in service. When these volatiles are lost, the shingles can become more susceptible to distortion.

This loss of volatiles affects the physical properties of the asphalt, leading to changes in flexibility and texture. Without the proper balance of these materials, shingles may not withstand moisture exposure evenly, causing some areas to absorb water differently than others. This can lead to curling, warping, or other types of distortion, compromising the overall integrity of the roofing material.

In contrast, fines, adhesives, and coloring agents play various roles in the composition of asphalt shingles; while these components contribute to the shingle’s structure and appearance, they do not primarily influence moisture absorption. The focus on volatiles highlights the fundamental aspects of how asphalt shingles perform under environmental stresses, illustrating their vulnerability to moisture issues when volatiles diminish.