Moisture penetration into asphalt through small cracks is both the most common symptom of asphalt decay and the most easily and cost-effectively remedied. Cracks usually start small, a result of the freeze-thaw cycle. Then, as moisture penetrates through these cracks and gets underneath the asphalt layer, it begins to disturb the subgrade layer and can quickly cause more widespread damage.
Effective crack filling begins with properly cleaning out the cracks of dirt, moss, and other foreign material. Then a hot-apply rubberized crack filler is poured into the exposed cracks. This method is superior to cold-apply products. The material is heated to approximately 400 degrees, poured into the crack and then torched to ensure a proper bond and surface smoothness. It will then cool and harden inside the crack, preventing moisture penetration.