A Stump Buried Under an Asphalt Driveway

A stump or buried log rots, collapses, and leaves a dip in the driveway above it. The asphalt has to come out, the wood has to come out, and the hole needs compacted backfill before you patch.

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How wood announces itself

The clue is a round or oval settlement that grows for a few years, sometimes with cracks radiating from a soft center. It may sit where a tree was removed to make room for the drive. Probing the edge or looking under a broken piece reveals dark, woody, or hollow ground rather than stone. The asphalt did not 'sink by itself.' The support turned into air as the wood decayed. Water then fills the cavity and the hole accelerates, especially through freeze and thaw. Sealing the cracks traps you into thinking the dip is maintained. The film cannot span a rotting stump. Cold patch in the bowl is a temporary driving surface, and it will follow the next collapse.

Taking the wood out

Cut out enough pavement to see the stump and the root mass that enters the paved area. Grind or pull the stump and the roots that would decay under the driveway. Leaving a deep root because it is 'mostly out of the way' leaves the next dip. This can be a larger hole than the surface crack suggested, and it may be close to utilities, so locate lines first. Do not burn the stump in the hole under the pavement edge. Backfill with crushed stone or other approved structural fill, compacted in lifts, not with the chips alone and not with topsoil. A planning weight for compacted crushed stone is about 1.4 tons per cubic yard. Confirm with the quarry. Cubic yards are length times width times depth in feet, divided by 27. The asphalt patch over that fill should be full driveway thickness on a vertical cut.

If you are paving a new drive where trees were cleared

Walk the footprint before the base goes in and probe soft circles. Old lot fill sometimes hides logs and brush piles. Those belong out, even when they are inconvenient. A new tree can be planted outside the drive, far enough that the trunk and major roots are not under the mat you just paid to compact. After the patch or the new pavement is in place, watch that spot for a season. Some additional settlement of deep backfill can happen, and a second surface correction is cheaper than discovering a second stump beside the first. When you replace asphalt over the repaired hole, size the tons with AsphaltTons.com for that patch area and thickness, and pay the plant's price for that day. Do not average the stump hole into a whole-driveway skim.

A practical sequence

Open the settled area until you can see the stump or log.
Remove the wood and the roots that lie under the driveway.
Backfill with structural stone compacted in lifts, not topsoil.
Patch the asphalt full depth on a vertical cut and watch the spot for further settlement.

The mistake to skip

Filling the dip with patch mix while the stump is still rotting underneath.

Questions people ask

Can I pave over a ground-out stump?

Only after the grindings and loose soil are removed and the hole is backfilled with compacted structural fill. Grindings alone settle.

Will a thicker asphalt layer bridge a stump?

No. Asphalt is not a bridge. The wood still rots and the thick spot still settles.

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