Crack Filling vs. Crack Sealing: When Each Method Makes Sense

Crack filling and crack sealing are two methods you can use to repair cracks in asphalt pavement. The question is, how do you know when to use each? Different jobs call for different repair methods. Here’s how each one works and when each makes sense.

What’s Crack Filling?

Crack filling places repair material into non-working cracks, which experience little movement as pavement temperatures change. These cracks may come from pavement aging or minor deterioration rather than repeated expansion and contraction.

The filler occupies the open space and reduces the amount of water that can reach the pavement base. It doesn’t need the same flexibility as crack sealant because the crack itself isn’t moving much throughout the year.

Crack filling offers several benefits:

• It works on non-working cracks. These cracks stay relatively fixed instead of changing width with seasonal temperatures.
• It limits water intrusion. Filling the opening reduces moisture below the pavement, where water can contribute to further damage.
• It provides an efficient repair option. Crews can address suitable cracks without using a flexible material meant for repeated pavement movement.

What’s Crack Sealing?

Crack sealing uses a flexible material on working cracks that expand and contract as temperatures change. The sealant bonds to the sides of the crack while allowing some movement without separating from the pavement.

That flexibility is the main reason crews use sealant on working cracks. A material that doesn’t move with the pavement may pull away from the crack edges, which leaves another opening for water to enter.

Crack sealing also offers several benefits:

• It works with pavement movement. Flexible sealant can accommodate changes in crack width throughout the year.
• It blocks water from the opening. A properly sealed crack reduces moisture intrusion into the pavement layers below.
• It supports preventive pavement maintenance. Sealing suitable cracks before they spread can reduce additional deterioration around the repair.

When To Use Each Method

Some cracks need filler. Others need a sealant that can handle movement. The deciding factor is whether the crack stays mostly fixed or changes width as temperatures rise and fall.

• Use crack filling on non-working cracks. These cracks experience little movement, so filler can occupy the opening without needing much flexibility.
• Use crack sealing on working cracks. Seasonal expansion and contraction call for a material designed to move with the pavement.
• Look beyond the crack when pavement damage is extensive. Filling or sealing won’t correct a larger pavement failure beneath or around the damaged area.

Stock Up for Your Next Repair Job

Now that you know the difference between crack filling and crack sealing, you can select the right method for each pavement crack. Matching the repair to the crack type can reduce water intrusion and support longer pavement service life.

At NAC Supply, we have the asphalt crack repair products you and your crew need. Shop our selection and stock up for your next round of asphalt repairs.