How Many Tons of Asphalt for a 12 by 40 RV Pad?

A 12 by 40 foot RV pad is 480 square feet. At 3 inches that is about 8.7 tons, and at 4 inches about 11.6 tons, using 145 pounds per cubic foot. Stabilizer jacks need pads so they do not dent the mat. Add length if the tow vehicle will sit on the asphalt too.

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The rectangle and the two thicknesses

A 12 by 40 foot pad is a common planning size for an RV stall. Twelve times 40 is 480 square feet. Compacted hot mix is planned at 145 pounds per cubic foot. Tons equal length times width times inches divided by 12, times 145, divided by 2000. At 3 inches, 480 times 3 divided by 12 is 120 cubic feet, times 145 is 17,400 pounds, divided by 2000 is 8.7 tons. At 4 inches, 480 times 4 divided by 12 is 160 cubic feet, times 145 is 23,200 pounds, divided by 2000 is 11.6 tons. Both are planning estimates. The plant ticket is the real weight. Choose thickness from the RV, the tow vehicle, and the soil, not from the fact that 12 by 40 is a round size. A heavier coach on soft ground needs a real base under whichever thickness you pick.

Jacks, the truck, and the edges

Stabilizer jacks and landing gear put a point load on a small foot. On a warm day they dent asphalt. Set wood or plastic jack pads under them every time you park so the foot is not biting the mat. The tow vehicle may sit off the 40-foot pad. If you will pave that extra length, add it. Fifteen more feet at 12 feet wide is 180 square feet, about 3.3 tons at 3 inches using the same formula, 180 times 0.25 times 145 divided by 2000. Confirm the site, the campground, or the town can accept the pad thickness at the edges so you are not building a lip the next stall cannot match. Extend the stone base past the asphalt so the edge does not break when a tire drops off the 12-foot width. Measure the coach before you lock that width in.

Base first, then the ticket

The tons above are asphalt only. The gravel base is separate, often planned near 1.4 tons per cubic yard, and the quarry ticket is the real stone weight. A 6-inch compacted base under 480 square feet is a different order from the 8.7 tons of mix. Proof-roll the base before the RV pad is paved. A soft spot under a 40-foot coach becomes a permanent dip. Do not use the 3-inch number on a yard that pumps. If you are comparing a 3-inch and a 4-inch quote, the difference on this pad is 11.6 minus 8.7, about 2.9 tons of asphalt, plus whatever base each quote includes. Ask which thickness and which base are in the price. This page does not set the price. It keeps the two weights from being mixed up. Small loads may also face a plant minimum above the neat tons.

A practical sequence

Use 480 square feet for a true 12 by 40 pad, then add tow-vehicle length if needed.
Compute 3-inch and 4-inch tons at 145 pounds per cubic foot.
Put pads under jacks and extend the base past the asphalt edge.
Treat 8.7 and 11.6 tons as planning estimates and match them to the plant ticket.

The mistake to skip

Ordering 8.7 tons and then parking jacks and the tow vehicle off that design.

Questions people ask

Is 8.7 tons enough for any RV?

It is the planning weight of a 12 by 40 foot pad at 3 inches, not a rating for every coach. A longer RV, a heavy toy hauler, or a soft yard changes the size, the thickness, or the base. At 4 inches the same rectangle is about 11.6 tons. The plant ticket is the real weight. Measure your RV and the tow vehicle before you order.

Do I include the gravel in the 8.7 tons?

No. The 8.7 tons are compacted asphalt at the planning density. Gravel is a separate material, often planned near 1.4 tons per cubic yard, with the quarry ticket as the real weight. A quote that says tons should say asphalt or stone. If it says one number for both, ask for the split before you compare it to this math.

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