Does hot mix weigh more than cold mix?

Yes, by about 6% compacted: 145 lb/ft³ (3,915 lb/yd³) for dense-graded hot mix versus roughly 137 lb/ft³ (3,710 lb/yd³) for cold mix. Cold mix retains more air voids because it is compacted at ambient temperature with a slow-curing binder — you simply cannot densify it the way rollers densify 300°F mix.

Why does cold mix cost more per ton than hot mix?

Packaging and chemistry. Bulk hot mix runs $100–150 per ton at the plant; bagged cold patch works out to $150–250 per ton equivalent because you pay for emulsified or cutback binder, additives that keep it workable in the bag, packaging and retail distribution. Per pothole it is still cheap — the premium only stings at volume.

How many bags of cold patch do I need for a pothole?

A 50 lb bag places about 0.4 ft³ and reliably covers roughly 0.8 ft² at 2 inches once consolidated into a real, irregular pothole with the recommended overfill. A typical 2 ft × 2 ft, 2-inch-deep pothole therefore takes about 5 bags (250 lb). Measure the hole; potholes are always deeper than they look.

Is cold mix a permanent repair?

Treat it as a 6–24 month repair. Quality high-performance cold patches can last years in low-traffic, well-drained holes, but cold mix never reaches hot-mix density or stability, ruts under heavy traffic and sheds under snowplows. The standard practice is cold patch in winter, cut back and replace with hot mix when plants reopen.

Can I order less cold mix because it is lighter?

Barely — the 6% density difference is smaller than normal waste allowance. For the same hole volume, order essentially the same tonnage: volume × 137 lb/ft³ for cold mix versus × 145 for hot mix. What actually changes your quantity is overfill: cold patch is placed proud by 30–50% and compacted into the hole.

When is hot mix simply not an option?

Below about 50°F ambient (colder for thin lifts), when plants are closed for the season, for jobs under plant minimums (often 1–2 tons), or when the repair cannot wait for a paving crew. In all four cases cold mix exists precisely to buy time — patch now, pave properly later.

Asphalt · Comparison

Hot mix vs cold mix asphalt

One is a structural pavement placed at 300°F; the other is a repair material that pours from a bag in January. They differ in weight, cost and lifespan — and each is the wrong answer to the other's problem.

Contents

1.Head-to-head comparison
2.Where each mix wins
3.Bagged cold patch math
4.The decision rule

Head-to-head comparison

Dense-graded HMA vs typical emulsion/cutback cold patch. Proprietary high-performance cold mixes narrow — but do not close — the gap.
Feature	Hot mix (HMA)	Cold mix / cold patch
Compacted density	145 lb/ft³ (3,915 lb/yd³)	~137 lb/ft³ (3,710 lb/yd³)
Placement temperature	275–325°F at the paver	Ambient — even below freezing
Strength & stability	Full structural pavement	Repair-grade; ruts under heavy traffic
Cost per ton	$100–150 bulk at the plant	$150–250 bagged equivalent
Availability	Plant hours, seasonal, 1–2 ton minimums	Bags and buckets, year-round, any quantity
Service life	15–25 years as a pavement	6–24 months as a patch
Best use	Driveways, lots, roads — anything permanent	Potholes, utility cuts, winter emergencies

The density gap is not a manufacturing tolerance — it is the whole story. Hot binder lubricates the aggregate so rollers can squeeze air voids down to 7–8%; cold binder cannot, so voids stay high and density, strength and life all follow. The mechanics are unpacked in asphalt density explained.

Where each mix wins

Hot mix: Pros

Full structural strength — the only choice for pavements
Compacts to 145 lb/ft³ with 7–8% voids; sheds water
Cheapest per ton in bulk ($100–150)
15–25 year service life placed on a proper base

Hot mix: Cons

Needs a plant in season, plus haul within a 2–3 hour window
Plant minimums make tiny jobs expensive
Placement below ~50°F ambient risks failed compaction
Requires paver/roller equipment or a contractor

Cold mix: Pros

Works year-round, straight from bag or stockpile
No equipment beyond a tamper — genuinely DIY
Available in exact small quantities (50 lb bags)
Keeps a pothole safe until a permanent repair

Cold mix: Cons

Repair-grade only: lower density (~137 lb/ft³) and stability
2–3× hot mix cost per ton in bagged form
Cures slowly; can shove and rut under traffic while green
Typical patch life 6–24 months, less under plows and trucks

Bagged cold patch math

Bag quantities for pothole work, using consolidated in-place coverage — not the optimistic loose spread.

Manufacturer ratings vary; irregular depth and required overfill consume more material than flat-slab math suggests. Round bags up.
Quantity	Volume placed	Coverage
50 lb bag	≈ 0.4 ft³	≈ 0.8 ft² at 2 in deepConsolidated, with the 30–50% overfill real potholes need
2 ft × 2 ft pothole, 2 in deep	4 ft² of repair	≈ 5 bags (250 lb)
1 ton of cold mix	40 × 50 lb bags	≈ 32 ft² of 2 in patchesPast ~15 bags, price a bulk cold-mix stockpile instead

The decision rule

Building or resurfacing anything: hot mix, full stop. Holding a pothole, a utility cut or an edge break — especially between November and April — cold mix, placed proud, compacted hard and scheduled for a hot-mix cutback when plants reopen. The costly mistake is not picking the wrong product; it is asking cold mix to be a pavement. It is a splint, not a bone.

Frequently asked questions

Weigh your job in both mixes

The weight calculator converts your dimensions to tons at hot-mix or cold-mix density — order the right amount either way.

Asphalt Weight Calculator

Keep reading

Sources & references

[1]MS-4: The Asphalt Handbook, 7th ed. — Asphalt Institute, 2007
[2]Asphalt Pavement Design Guide (APD-1) — National Asphalt Pavement Association, 2020