Cleaning the cracks is an essential step to ensure that the sealant will adhere to the sides of the crack. After cleaning, check the cracks for depth. A backer rod should be placed in large deep cracks to conserve sealant. The backer rod should be a compressible, non-shrinking, non-absorbent material with a melting point higher than the temperature of the sealant. The backer rod should be about 25 percent wider than the crack, to prevent slipping or floating out after placing the sealant.
After the cracks are prepared, they are sealed with liquid asphalt. Equipment used for crack sealing or filling varies from truck-mounted pressure applicators with hand wands to pour pots. Each type of equipment can heat and maintain the temperature of the sealant in the 450 F range.
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