Choose the patch product after you know how long the patch must last, how deep the hole is, and whether the base under it is sound. Those three checks decide between plant hot mix, stockpile cold mix, and a bagged cold mix product. Price alone does not decide it, because the cheapest product for a temporary winter hole is the wrong product for a permanent squared repair.
Start with the hole, not the shelf. Measure the squared patch, record its depth readings, and look at the base. A product choice made before those checks can fill a hole that should have been dug out, or put a temporary material where a permanent repair was needed.
Which asphalt patch product should you use?
Use plant hot mix for a permanent squared repair when a plant is open, transport is practical, and the patch can be compacted properly. Use cold mix for a temporary or emergency patch, or for a small shallow patch where hot mix is not available. Use a bagged cold mix product for a small driveway patch that you place and compact yourself. Check the base first in every case: a patch product cannot fix a failed base.
That order matters because the agencies that classify these products classify them by intended life. Caltrans lists hot mix asphalt as the preferred patching material and cold mix asphalt as a temporary fix only. For dig-outs, where failed material and base are removed and replaced, Caltrans again lists hot mix as preferred and cold mix as an emergency fix only.
What are the product choices?
| Product | What it is | Best fit | Limit |
|---|---|---|---|
| Plant hot mix | A typical asphalt mix produced by a hot mix plant, placed and compacted while hot | Permanent squared repairs, mill-and-fill work, higher traffic areas | Needs an open plant, transport, and proper compaction equipment |
| Stockpile cold mix | A cold emulsion mix or generic stockpile mix that can be stockpiled and worked when cold | Temporary patches, emergency work, small to medium holes in cold or wet conditions | Classified as a temporary fix; shallow depth limit applies |
| Bagged proprietary cold mix | A cold mix that uses a proprietary binder and is sold in bags rather than stockpiled | Small driveway patches placed by hand with a hand tamper or plate compactor | Bag yield and lift limits come from the product label, not from a universal figure |
| Mastic | A pourable patching material that gives a smooth surface | Centerline joints and longitudinal joints along shoulders | Dishes under wheel loads, so it does not belong in wheel paths |
| Spray injection | A method that uses truck or trailer mounted equipment to blow debris out, spray tack, and blow aggregate and emulsion into the hole | Fast crew work over many holes, including work in adverse conditions | Needs specialist equipment; it is not a bagged product for one driveway hole |
Check how long the patch must last
A temporary patch holds a pavement until a permanent repair can be made. A permanent patch is built to stay, with squared edges, a sound base, and full compaction. Name which one you need before you buy, because the same cold mix product can serve the first job and fail the second.
The temporary label does not mean a cold mix patch always fails fast. In the Strategic Highway Research Program H-106 study, more than 1,250 cold-mix patches were placed at 8 test sites in the United States and Canada, and with quality materials, patches remained in service for several years. In that study, 56 percent of all patches survived until the final round of monitoring in 1995. The lesson is narrower than a brand claim: material quality and placement matter, and a temporary product used well can outlast a permanent product placed badly. It still does not turn a temporary product into the preferred choice for a permanent repair.
Check depth and lifts
Depth decides whether one lift is enough. The Minnesota patching study found that cold-mix patches belong only in shallow potholes with depths of 2 inches or less. Deeper potholes need two lifts, with each lift compacted by a handheld compactor, so the cold mix does not dish or dent as it settles. One cold mix maker's instructions state the same limit in metric terms: lifts of at most 5 cm (2 in), with each lift compacted and the last loose lift 1 to 1.5 cm above level.
Work from a measured hole, not from the ragged outline. For one rectangular driveway patch 4 ft long, 3 ft wide, and 2 in deep, the hole volume is 12 sq ft times 0.1667 ft, which equals 2.0 cu ft, or 0.074 cu yd. That figure is the hole volume only. It does not give a bag count or a tonnage, because bag yield varies by product. Read the yield line on the label you actually buy, and order from the measured volume.
Check plant access and compaction
Hot mix needs a plant that is open and close enough for transport, plus compaction that suits the patch size. The Minnesota study notes the seasonal side of this check: in northern Minnesota, asphalt plants shut down for winter and do not reopen before March, so cold-weather pothole work aims at short-term fixes that can be replaced when warm weather returns or when the pavement can be milled and overlaid. Your plant calendar may differ, but the check is the same: confirm the plant is open before you plan a hot mix repair.
Compaction is part of the product choice, not an extra. The Minnesota study requires a handheld compactor when hot mix is used for pothole repair, and compacted lifts for deeper cold mix work. A bagged product placed without compaction, or a hot mix patch left uncompacted, fails on placement rather than on the material itself.
Check the base before you buy
Look at what is under the hole. If the base has disintegrated, lost load-carrying capacity, or been infiltrated with fine material, the repair is a dig-out: remove the failed pavement and affected base layers, replace the base, tack the edges, and place a new surface. Caltrans lists hot mix as the preferred dig-out material and cold mix as an emergency fix only. Filling over a failed base with any patch product leaves the new surface sitting on material that has already failed.
The same study warns against one shortcut in hot mix work: hot mixes that use recycled materials were avoided, because the aged binder slowed heating, its fines inhibited bonding of the new binder and aggregate, and the patches aged faster. When hot mix is the choice, it should be virgin hot mix from a plant or a recycling mixer that makes virgin hot patch material, not aged recycled mix.
Common product mistakes
- Using sealcoat as a patch fill. Sealcoat coats a surface. Fill the hole with patch material first, and treat sealcoat as a surface coat after a patch has been placed, not as the fill itself.
- Placing cold mix in a deep hole in one lift. A hole deeper than 2 inches needs lifts, with each lift compacted, or a different repair method.
- Putting mastic in a wheel path. Mastic dishes where wheels load it. Keep it on centerline joints and longitudinal shoulder joints.
- Choosing on bag price before checking intended life, depth, and base condition. The cheapest bag for a temporary hole is an expensive repeat repair when the job needed a permanent patch.
- Skipping compaction or edge preparation. A squared patch with vertical sides to sound pavement, a cleaned hole, tack on the edges where the method calls for it, and full compaction decide the result as much as the product does.
- Ordering from a guess instead of a measured hole volume. Measure the squared patch first, then read the label yield for the product you buy.
Sources and scope
- Caltrans, Maintenance Technical Advisory Guide, Volume I, Chapter 5, Patching and Edge Repair (October 2007): hot mix asphalt preferred for pothole patching, cold mix asphalt temporary fix only; dig-out materials hot mix preferred, cold mix emergency fix only; patch boundaries marked and cut, failed material removed, base recompacted, hole prepared, material compacted to a level similar to new pavement. Accessed 2026-10-27.
- FHWA, A Better Fix for Potholes, FHWA-RD-00-055 (January 2000): SHRP H-106 findings, more than 1,250 cold-mix patches at 8 test sites in the United States and Canada, material quality mattering more than method, quality patches remaining in service for several years, 56 percent surviving to final 1995 monitoring. Accessed 2026-10-27.
- Minnesota Department of Transportation, Pothole Patching Study Yields Best Practices Guidance, Report 2017-25 summary (June 2017): cold mix only in holes 2 inches deep or less, deeper holes in two compacted lifts, hot recycled mixes avoided, mastic only for centerline and longitudinal shoulder joints and not for wheel paths, handheld compactor for hot mix pothole repair, winter plant shutdown in northern Minnesota. Accessed 2026-10-27.
- Asphalt Institute, Asphalt Magazine, Achieving top-performing pavement patches: hot mix as a typical plant-produced mix, cold mix as a stockpile mix worked when cold, proprietary cold mix sometimes sold in bags, semi-permanent patching needing more preparation. Accessed 2026-10-27.
- PRO-ROAD, Cold Mix application instructions: lifts maximum 5 cm (2 in), compact each lift, last loose lift 1 to 1.5 cm above level. Accessed 2026-10-27.
- NIST Handbook 44, 2026, Appendix C: the conversion relationships used for the worked example. Accessed 2026-10-27.
Scope: the guidance on this page helps a reader choose a patch product family for one hole. It does not set a universal bag count, tonnage, price, lifespan, or repair specification. The governing product label, project specification, site condition, and responsible qualified people control the purchase and the repair for a real pavement.
Review responsibility: Saleem Sial owns the published calculation and editorial checks. The source list above is part of that check. Waseem Sial, External Reviewer and Engineer, remains listed for ongoing external review; no completed external-review date is claimed.
Measure the hole first with the asphalt patch measurement guide. For the thickness question, use the loose versus compacted thickness guide. For ordering and delivery, use the asphalt ordering allowance guide, or return to the Asphalt Calculators hub.
