Crack Seal Versus Crack Fill

Crack sealing usually means routing a reservoir and placing a flexible sealant that can move with the crack. Crack filling places material in a quieter crack without that designed reservoir. Neither replaces a patch where the asphalt is gone. Hot kettle work stays with the crew.

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A reservoir for a crack that moves

Crack sealing, in the way pavement people use the words, usually means routing a reservoir and placing a flexible sealant that can stretch and compress as the crack moves with temperature. The reservoir gives the sealant a shape, not a smear on the surface. The quote should say routing if routing is included, because a routed crack and a crack that is only poured are different amounts of work. You are reading the bid. You are not getting a method for running a hot kettle, a router, or a melter on your own driveway. Hairline cracks are a different case again. They may be too narrow for a reservoir, and stuffing them can do more cosmetic harm than good.

Filling a crack that is mostly quiet

Crack filling means placing material in a crack that is not working as much, without a designed reservoir. The crack is there, and the filler is meant to keep water out, but the geometry is simpler than a routed seal. People say seal and fill as if they were one tube at the store. Ask the quote which operation it includes, what material it uses, and whether the cracks were judged to be moving. A moving crack that is only stuffed will often reopen or pull the material out. A quiet crack does not always need a routed reservoir. The judgment is the contractor's, and you should hear it before you compare two bids that use the same word, crack, for different work.

Missing asphalt is a patch

Neither sealing nor filling replaces a patch where the asphalt is gone. A pothole, a crumbled edge, or a spot that has raveled down to the base is a hole, not a crack with two walls. Pouring sealant into that hole does not restore thickness. If the repair becomes hot mix, plan compacted tons near 145 pounds per cubic foot and treat the plant ticket as the real weight. A small patch may be less than a ton, and the ticket may be a partial load. Say that the density figure is a planning estimate. Keep crack items and patch items on separate lines so you can see whether the bid routes cracks, fills them, or actually replaces asphalt. Water is the reason any of this matters. Open cracks feed the base.

A practical sequence

Ask whether the bid routes a reservoir or only fills the crack.
Ask which cracks are moving and which are considered quiet.
Treat hairline cracks as their own case, not as automatic reservoirs.
Patch missing asphalt separately, and leave hot kettle work to the crew.

The mistake to skip

Pouring filler into a pothole and calling it crack sealing.

Questions people ask

What is the reservoir in crack sealing?

Routing opens a shaped reservoir so a flexible sealant has room to move with the crack. Crack filling skips that designed reservoir and places material in a crack that is not working as much. Ask the quote which one you are buying. Hairline cracks are a different case. Neither operation replaces a patch where the asphalt is missing.

Should I heat a kettle and seal cracks myself?

Hot kettle and melter work is a crew job with burn risk and traffic to manage. Read the quote for routing versus filling, and for which cracks they will treat. Do not turn the bid into a home method. If asphalt is missing, ask for a patch. Any hot mix tons are a planning estimate near 145 pounds per cubic foot, and the plant ticket is the real weight.

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