The Two Sands You Are Actually Buying
Almost everyone who searches for how much sand for pavers is looking for one number. The reason so many patio orders come up short is that there are two separate sand products in a paver install, and they are bought in completely different ways. One is measured by volume under the whole patio. The other is measured by how much open joint your paver pattern creates. Get those confused and you either run out mid job or drive back to the store on a Sunday afternoon.
Bedding sand sits under the pavers
Bedding sand is the leveling layer. You screed it flat, set the pavers into it, and it takes up the small differences between paver thicknesses so the finished surface reads level. Finished, that layer is normally about 1 inch thick. It gets sold loose by the cubic yard or in bags, and for anything bigger than a small landing the loose option is the sane one.
Under the bedding sand there is a compacted gravel base doing the actual structural work. For a patio that base is commonly in the range of 4 to 6 inches, and anything a vehicle drives on wants more than that. Figure the base as its own material and its own number. It is not part of your sand math.
Joint sand goes between them
Joint sand is swept into the gaps after the pavers are down and compacted. Polymeric joint sand is the common choice now. You sweep it in dry, mist it with water, and the polymer binds the grains so the joints hold together instead of washing out with every downpour.
These two products are not interchangeable in either direction. Bedding sand is the wrong gradation for joints and it will wash and settle out fast, leaving open gaps for weed seed. Joint sand is not what you want to screed a bed with. If you finish a patio and have a pile of bedding sand left over, resist the urge to sweep it into the joints.
Key takeaway: order bedding sand by volume and order joint sand by joint length and width. Patio square footage alone will not tell you the second number.
The Math for Bedding Sand
The 1 inch shortcut
Because 1 inch is one twelfth of a foot, a 1 inch deep layer of sand over a given area takes exactly one twelfth as many cubic feet as the area has square feet. So the shortcut is simple. Take your square footage and divide by 12. That is your cubic feet of sand at a true 1 inch depth.
A small example first. A 60 square foot landing outside a back door comes out to 5 cubic feet at 1 inch. That is a bagged quantity, and you would not call a supplier for it.
Converting to cubic yards
Once the patio gets real, you want cubic yards, because that is the unit bulk suppliers deliver in. A cubic yard is 27 cubic feet, so divide your cubic feet by 27 and you have yards.
That is the whole conversion. Square feet divided by 12 gives cubic feet. Cubic feet divided by 27 gives cubic yards. If you do not want to do it by hand, a sand delivered loose by the cubic yard order page and any decent paver sand calculator will run the same two steps for you.
Worked example on a real patio
Take a 14 by 20 foot patio, which is a very ordinary backyard size.
- 14 times 20 is 280 square feet.
- 280 divided by 12 is about 23.3 cubic feet.
- 23.3 divided by 27 is about 0.86 cubic yards.
So a true 1 inch bed under a 280 square foot patio is a little under a cubic yard of sand. Hold on to that number, because the next section explains why it is not what you should order.
For irregular patios, break the shape into rectangles, figure each one, and add the areas together. Where you have a curved edge, treat it as the rectangle that contains it. That rounds you up rather than down, which is the direction you want to be wrong in. For a round patio, multiply the radius by itself and then by 3.14 to get square footage, then run the same depth math.
If you are buying bags, read the coverage printed on the bag instead of guessing. Coverage varies by product and by the depth the manufacturer assumed when they printed it, so a bag that covers a certain area at one depth covers much less at another. Once you are past a few dozen bags, loose delivery by the yard is noticeably cheaper and a lot less hauling.
Why the 1 Inch Number Is Never What You Actually Use
Here is the part the pure calculator pages tend to skip. The 1 inch figure describes the finished bed after everything is set and compacted. It does not describe how much sand you consume getting there.
Sand starts disappearing the moment you screed. The gravel base under it is full of voids, and fine material filters down into them. Then you run the plate compactor over the set pavers, and that drives sand up into the bottom of the joints from below. Both of those are real volume, and both come out of the pile you ordered.
Low spots are the other silent consumer. If the base has dips in it, the sand fills them before you ever start screeding a level layer. A base that reads acceptable to the eye can still swallow a surprising amount of bedding sand in the low corners.
The common fix in retail planning guides is to run the volume math at 2 inches instead of 1 inch. That roughly doubles the number and gives you a cushion. On the same 280 square foot patio, the 2 inch calculation comes out around 1.7 cubic yards instead of 0.86. That is the difference between one delivery and a second trip on a Saturday with half your pavers set.
So the practical approach is to run both. Calculate at 1 inch to know your absolute minimum. Calculate at 2 inches to know what to order. Land your order at or above the higher number.
Leftover loose sand is easy to use up. It goes under stepping stones, it levels a shed pad, it fills a sandbox. Coming up short with pavers half set and a screed board in your hand is the outcome that actually costs you something.
Figuring Joint Sand Separately
Joint sand consumption depends on three things your patio square footage does not tell you. Those are joint width, paver thickness, and how many joints your pattern creates.
That last one surprises people. A patio laid in small pavers with a herringbone pattern has far more linear joint per square foot than the same patio laid in large format slabs. Two patios of identical size can need very different amounts of joint sand. Paver thickness matters too, because a thicker paver means a deeper joint to fill, and joint width is the obvious multiplier on top of both.
Polymeric sand bags print a coverage range rather than a single figure for exactly this reason. The low end of that range assumes wide joints and thick pavers. The high end assumes tight joints and thin pavers. Measure your own joint width and look at your paver thickness before you pick a spot in that range, and do not default to the optimistic end because it makes the order smaller.
Order toward the generous end. Joints that are not filled all the way to the bottom are where the next few years of settling and weed growth come from. An underfilled joint looks fine on day one and looks like a problem by the second spring.
Filling joints is a multi pass job. Sweep the sand in, compact or tamp, then top off, because the sand drops as it works down into the joint. Expect to go around the patio more than once before the joints stay full. When you are done, keep one spare bag sealed and dry. You will want it for touch ups the following spring.
Fall Installs and Polymeric Sand Curing
Watch the forecast, not the calendar
Polymeric sand has a specific sequence. It gets swept into dry joints, activated with water, and then left alone to cure. Rain landing inside that window is the problem, and fall is when that window gets harder to find.
Cool fall temperatures are genuinely pleasant to work in, and the ground is usually in good shape for base work. What you lose is daylight and drying time. Days are shorter, dew is heavier in the morning, and anything that gets wet takes longer to dry out than it would in July.
Dry matters more than rain free. Pavers and joints still damp from morning dew will activate the polymer early, and that is how you end up with haze or a crusty film on the paver faces. Rain is not the only water on the patio.
A workable fall sequence looks like this. Set and compact your pavers earlier in the day. Wait until the surfaces are genuinely dry, not just not raining. Then sand and water with enough daylight and dry hours left afterward for the cure. Follow the cure time and temperature guidance printed on the bag you actually bought, because products differ and the bag is the authority on its own chemistry.
What to do if you run out of dry days
Sometimes the forecast just will not give you a window, and that is fine. Get the pavers set and the bedding layer done, fill the joints with regular sand for the winter, and come back to polymeric sand in spring. Base work and bedding sand are far less weather sensitive than polymeric curing, so you can push the weather dependent step without leaving the patio unusable.
If you already bought the polymeric sand, store the unopened bags somewhere dry and up off a concrete floor. Concrete wicks moisture, and bags that take on water sitting in a shed all winter are usually ruined. A pallet, a shelf, or a couple of scrap boards is enough.
Putting the Whole Order Together
Here is how the 280 square foot example turns into an actual call to a supplier.
- Base. A compacted gravel base in the 4 to 6 inch range for a patio, figured as its own volume. Remember that gravel loses volume when you compact it, so this is not a number to shave.
- Bedding sand. Roughly 1.7 cubic yards, which is the 280 square feet figured at 2 inches rather than the 0.86 yards a true 1 inch bed would finish at.
- Joint sand. Polymeric, quantity picked from the bag coverage range using your real joint width and paver thickness, ordered toward the generous end.
- Edge restraint. Enough to run the full perimeter.
Measure the perimeter separately. Edge restraint is a linear foot number and has nothing to do with your sand volume, so it is easy to forget until the pavers are down and the edges start creeping.
For anything past a small landing, buy the base gravel and the bedding sand loose by the yard. Keep the joint sand bagged so it stays dry, since dry is the entire point of that product.
When the pile shows up, stage it on a tarp or on the driveway rather than on grass. You will recover more of it, and your lawn will forgive you. Cover the bedding sand if rain is in the forecast. Soaked bedding sand is miserable to screed and it will slow the whole job down.
Three numbers to write down before you call a supplier. Square footage of the patio. Joint width of your paver pattern. Perimeter length. With those three, a supplier can talk you through the rest in about two minutes.
How We Started
We started Mulch Mound because we got tired of the hassle that came with buying landscaping materials. The options were either loading bags into your car at a garden center or calling around to local suppliers, trying to figure out pricing, minimums, and delivery schedules. Neither option felt convenient or transparent.
Three of us – Alec, Mo, and Tyler – decided there had to be a better way. Alec and Tyler got their start back in 2013 running a landscaping business during college, moving mulch and mowing lawns to pay tuition. That experience taught them how frustrating it was to source materials, and years later, that frustration turned into Mulch Mound.
We focus on making it simple to get mulch, stone, and soil delivered directly to your home. Order online, pick your delivery date, and we handle the rest. No loading bags. No calling multiple suppliers. No wondering if you bought enough or paid a fair price.
We work with quality local suppliers in the areas we serve and aim to be straightforward about what we offer and what it costs. Landscaping is hard work. Buying the materials for it shouldn't be.
Frequently asked questions
How deep should the sand be under pavers?
About 1 inch finished, and thicker is not better. A sand bed much deeper than that behaves like a cushion. Individual pavers rock under foot traffic and sink at different rates, and you end up with an uneven surface that no amount of sweeping fixes.
If you are tempted to dump extra sand into a dip to save time, do not. Fix the dip in the gravel base, compact it, and keep the sand layer uniform across the whole patio.
Can I use regular sand instead of polymeric sand in the joints?
Yes. Plain joint sand has been used for decades and it works. The tradeoffs are that it needs topping off after heavy rain, and more weed seed will germinate in the joints because nothing is binding the grains together.
Regular sand is actually the better pick in two situations. One is a temporary winter fill when the weather will not give you a curing window. The other is a patio you expect to lift and reset at some point, like a section over a utility line, since hardened polymeric joints make that job much harder.
Do I need both bedding sand and joint sand?
For any new install, yes. The only jobs where you buy just one product are maintenance jobs. A joint refresh on an existing patio needs joint sand only. A base repair where you lift a section, correct the bed, and set the same pavers back down needs bedding sand only, and you can often reuse the existing joint material that came up with them.
What happens if it rains on polymeric sand before it cures?
Light rain shortly after activation tends to wash sand out of the top of the joints and leave a hazy film across the paver faces. Heavy rain is worse. It can pit and erode the joints badly enough that they have to be reopened and redone.
If it happens, scrub the residue off the paver surfaces quickly rather than letting it set. Wait for everything to dry fully, refill the washed joints, and plan on buying another bag. That is the main reason to keep a spare on hand in the first place.
Can I use leftover bedding sand to fill the joints?
It is the wrong gradation for the job. It washes out and settles faster than joint sand, so you get open joints and shifting pavers sooner than you should.
Put it somewhere useful instead. It works fine under stepping stones, as ballast, or as a leveling layer for a small pad. Just keep it out of the joints of a patio you just spent a weekend building.