What Has to Be Done Before You Touch the Sand
Screeding is a finish step. It is the last thing that happens before pavers go down, and it assumes the hard work is already behind you. Excavation is done, the base is in, and the base has been compacted in lifts until it stops moving under the plate. If any of that is still unfinished, screeding sand over it will not save the job. The sand layer copies whatever shape the base holds. It does not correct it.
That includes slope. Your drainage pitch away from the house has to live in the compacted base, not in the bedding sand. People try to build fall into a one inch sand layer all the time, and it never works, because there is not enough material to play with and the sand consolidates down to the base profile under compaction anyway. If the base runs flat, the finished patio runs flat, and water sits on it.
Before you set a single rail, walk the whole base. Step heel to toe across it and feel for soft patches. Sight down the surface from a low angle, which shows up dips far better than looking straight down. Anything you find gets fixed in the base material and recompacted. A soft spot is the one defect that a thick patch of sand will cheerfully hide for about two months before the pavers above it settle into a visible saucer.
The other thing to square away in your head is height. Screed level is not finished paving level. Your rails sit one paver thickness below where the surface will end up, and if you get that wrong, every edge, step, and door threshold on the project is wrong with it. Run a string line at the finished surface height first, pull it taut, check it for slope, and then measure down from the string to set everything else. Measuring up from the base is how people lose track.
Key takeaway: Screed when the base is finished, compacted, and already carrying your slope. Set a string at finished height and work down from it.
Weather drives the schedule on a two day job. Sand that gets rained on overnight has to be pulled again, which means you should only ever screed as much as you can cover with pavers that same day. Check the forecast before you order, and if Saturday afternoon looks wet, plan a shorter first day rather than gambling on a tarp staying put.
The Right Sand for a Bedding Layer
You want washed, angular concrete sand, which most yards sell as bedding sand. The grains are sharp and varied in size, so they wedge against each other under compaction and hold the pavers where you set them. That same angularity is what lets the bedding material work its way up into the bottom of the joints and lock the field together.
All-purpose sand, sandbox sand, beach sand, and masonry sand are all the wrong call here. They are too fine and their grains are too rounded, so they will not lock into the joints and they hold water instead of letting it pass. A bed built out of fine rounded sand stays soft, and soft beds are why pavers start rocking under a wheelbarrow a year later.
In some regions installers use a fine crushed aggregate for the bedding course instead of sand. It screeds exactly the same way, with the same rails and the same board, and it tends to hold its shape a little better while you work. Worth a phone call to your supplier to ask what is standard locally, because availability varies a lot by market.
How Much to Order
Buy by volume for a one inch bed across your square footage, then add a cushion on top of that number. It is easy to work out how many yards a one inch bed takes once you have the area, and the cushion matters more than the precision does. Running short in the middle of a strip means either a visible seam where the fresh material meets the old, or a trip to the yard with half the patio sitting open.
Keep the pile tarped from the moment it lands. Bedding sand that soaks up rain screeds thick, sticks to the board, and compacts unevenly under the pavers. The target condition is damp. Squeeze a handful and it should hold a loose shape without water showing. Bone dry sand runs out from under the screed board like it is trying to escape. Saturated sand drags and tears behind the board instead of leaving a clean surface.
Tools and Rails: The Short Hardware List
This is a cheap step to equip. You need a screed board that stays straight, something to ride it on, and a way to check your heights.
- Screed board. An aluminum paver screed, or a 2x4 that will not wobble or bend across the span you are pulling. Sight down any board before you use it. A twisted board transfers that exact twist into the bed, over and over, all weekend.
- Rails. Three quarter inch inner diameter black steel pipe is the standard, because its outside diameter lands right around a one inch bed. One inch outside diameter square tubing does the same job and does not roll when you set it down.
- Enough rails. Two is the minimum. Three or four lets you leapfrog them forward without stopping to clean and reset the same two pipes every strip.
- String line at finished grade, plus a torpedo level or a four foot level, a tape measure, a margin trowel or small hand trowel, a plastic leaf rake for moving loose sand gently, and knee pads you will actually keep on.
Note what is not on that list. A plate compactor is base equipment. Nothing mechanical touches the screeded bed before the pavers are down. You compact the base, you screed, you lay, and then the plate comes back out to run over the paver surface.
Rail length matters more than most people expect. Rails that run past both ends of the strip you are filling give you a clean place to start the pull and a clean place to finish it, instead of forcing you to feather the last foot by feel. Longer rails also give you more surface to check with a level.
Setting the Rails and Pulling the First Strip
Set Rails Parallel, Not Just Flat
Lay your two rails parallel and no further apart than your screed board spans comfortably. You want several inches of board hanging over each rail at all times, because the moment an end slips off, the board drops into the strip and you are re-pulling that section.
Bed each rail into a thin line of sand and tap it down until it sits at exactly the height you measured off the string. Then check it twice. First run the level along each rail end to end, then check across the span from rail to rail. Both checks have to pass. A rail that is true along its length but sitting high relative to its partner tilts the whole strip.
Remember that the rails follow the slope rather than sitting dead level. Both rails run downhill at the same rate, so the bubble will not be centered when you check across the span on a pitched patio. That is correct. Your reference is the string line, not the bubble.
Pull With Two Hands and a Back Drag
Shovel or rake sand into the strip between the rails, slightly proud of the pipe tops, but only in the stretch you are about to pull. Do not dump an entire patio worth of sand between the rails at once. You will spend more time pushing the excess around than screeding.
Pull the board toward you in short strokes with a slight side to side sawing motion. The sawing is what does the cutting. Keep both ends riding hard down on the rails the whole time, because lifting one end even slightly leaves a high ridge you will not see until a paver rocks on it.
Then do it again. Make a second pass over the same stretch. The first pass moves material and fills the hollows. The second pass is the one that actually makes it flat, and skipping it is the single most common reason a bed that looked fine turns out wavy under the pavers.
Whatever sand piles up past the end of the strip is spoil. Rake it forward into the next area you are going to fill. Never push it back onto bed you have already finished, because loose sand dropped on a screeded surface does not compact the same as the sand under it.
Work in Strips, Not the Whole Patio
Here is the mistake that costs solo DIY installers their weekend. They rail and screed the entire area at once because it feels efficient, then stand at the edge and realize they cannot reach the middle without walking across their own work.
There is a material reason to work small too. Loose bedding material does not consolidate identically everywhere. Moisture content and grain packing vary from one part of a pile to the next, so one patch settles more than the patch beside it under the same compaction. Short strips keep that variation contained in an area you can still fix.
So the rhythm is screed a strip, lay pavers on that strip, move the rails forward, screed the next one. At every moment you are standing on laid pavers or on bare base. Never on sand.
A workable strip is however wide you can comfortably lay pavers across while kneeling at the edge of it. For one person that usually lands around three to four feet. Wider than that and you start leaning out over the bed, which is how a hand or a knee ends up where it should not be.
Start at the high point and work downhill where the layout allows. You are not dragging sand uphill, and gravity is helping your spoil move in the direction you want it. Map the paving direction before you start so the final strip finishes at an open edge rather than trapping you against the house wall with nowhere to stand.
Key takeaway: Strip, lay, move, repeat. That sequence is what makes a weekend realistic. Screeding everything first and then panicking is what makes it a three weekend job.
Filling the Rail Trough Without Wrecking the Bed
When you lift a rail out you leave a long channel the depth of the pipe running down the bed. That is normal. Everyone who screeds on rails deals with it, and it takes about a minute per rail to fix properly.
Lift the rail straight up. Do not drag it out sideways, which tears the edges of the bed on both sides and turns a clean channel into a ragged mess that is much harder to close.
Fill the trough with loose sand, slightly proud of the surrounding bed, then screed over it with a short straightedge riding on the already screeded bed on both sides of the channel. You are using your own finished surface as the rail now. One pass to move material, one pass to cut it flat, same as before.
What you must not do is pack the trough with a trowel and call it level. It will look perfect. It will also be denser than the screeded sand on either side of it, which means it compacts less under the plate, which means the row of pavers sitting over that line ends up riding high. Hand-packed strips are easy to spot on a finished patio once you know to look for them.
The same rule covers damage. If you drop a paver in the bed or catch it with a knee, do not smooth the dent over with your hand. Add loose sand and re-screed that patch with a straightedge bridging undisturbed bed on both sides. If the damage is too wide to bridge, reset a rail and pull that stretch of the strip again. Re-pulling takes a few minutes. Chasing a settled low spot after the pavers are down and compacted takes an afternoon and a lot of swearing.
Keeping Off the Bed and Finishing Clean
Nobody walks on the screeded bed. Not you, not the helper, not for one quick step. No kneeling on it, no setting a bucket or a level or a bag of anything on it. Every spot that gets pressed is a pre-compacted spot, and it will read as a dip after the pavers go down and the plate runs over them.
That means staging matters. Keep sand piles, paver pallets, and tools either outside the screeded area entirely or on pavers you have already laid. Plan wheelbarrow routes across bare base or across finished paving. Walking a loaded barrow over fresh bed is the fastest way to undo an hour of careful work.
When you lay, set each paver down from above rather than sliding it into position. Sliding plows the sand in front of the paver into a ridge, which lifts the next piece and throws your joints off. Place, adjust with light taps, move on.
If rain arrives before you can pave a screeded strip, resist the urge to rescue it. Let it drain, then pull it again. Damp sand screeds beautifully. Waterlogged sand does not, and a bed that got soaked and then dried in place is unevenly consolidated no matter how good it looks on top.
A realistic weekend split looks like this. Day one morning is base checks, string lines, rail setup, and getting the sand delivered and tarped. The rest of day one and all of day two is strip, lay, move, repeat. Your last checks before you run the plate over the finished pavers are edge restraint and joint sand, not more bedding sand. Bedding sand never goes on top of pavers to level them. If a paver sits wrong, lift it and fix the bed underneath.
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
What tools do you need to screed sand for pavers?
The working list is a straight screed board, rails, a string line, a level, a tape, a hand trowel, a plastic leaf rake, and knee pads. Two items earn their keep in ways that are easy to miss. A spare rail means you can set the next strip while the current one is still being paved, so you are never waiting on a pipe to be freed up and cleaned. And a short straightedge, something in the two to four foot range, is what you use for trough fills and spot repairs where your full length board is too long to bridge cleanly.
Everything else is optional. If you are choosing between spending money on a nicer board or buying two extra rails, buy the rails.
Can you walk on screeded sand before laying pavers?
No, and the reason shows up later rather than immediately. Your foot pre-compacts the sand under it, so that patch has already given up most of the settlement it was going to give. The sand around it has not. When you run the plate compactor over the finished pavers, the untouched areas consolidate down and the footprint cannot, so the pavers above it sit relatively low and the whole area reads as a soft dip when the light hits it sideways. You cannot see it in the sand. You see it in the finished surface, which is far too late to do anything about.
Can I use masonry sand if the yard already has a pile of it?
No. Masonry sand is fine and rounded by design, which is exactly what you want when you are mixing mortar and exactly what you do not want under pavers. Those rounded grains will not wedge together or migrate up into the joints to lock the field, and the fine texture holds moisture in the bed instead of letting it drain through. Keep the pile for mortar work, tuckpointing, or mixing with your supplier's blessing, and order washed concrete sand for the bedding course. The cost difference on a typical patio is small compared to lifting the whole thing in two years.
How do you know the bed is flat enough without stepping on it?
Two checks, both done from the edge. First, lay a long straightedge flat across the strip from one side to the other and look for daylight under it. Slide it along the strip in overlapping positions, rotating it to different angles as you go, since a bed can be true one direction and off in another. Second, crouch at the end of the strip and sight down the bed with your eye close to the surface. A low raking view across the sand exposes waves and ridges that are completely invisible from standing height. If both checks pass, the strip is ready for pavers.
What if the finished pavers still rock after compaction?
Rocking pavers almost always trace back to the base or to bedding depth rather than to your screeding technique. A soft or uncompacted spot in the base lets everything above it move. A bedding layer that ended up too thick stays soft and allows the paver to shift under load. A layer too thin leaves the paver riding hard on base irregularities. Lifting the affected pavers and dropping fresh sand under them is a patch, not a repair, and it tends to come back within a season or two. If more than a couple of pavers in one area rock, pull them, look at what the base is doing underneath, and fix it there.