Block paving laying patterns and waste

The laying pattern is not only a look — it decides how strong the finished area is and how many cuts you make getting there. Stretcher bond and basketweave go anywhere on foot, herringbone spreads a wheel load best on a driveway, and a mixed three-size module suits a larger yard. Angled and modular patterns cost you more blocks in waste.

Block paving is not held by mortar. It is held by friction and by the interlock between blocks: when a wheel rolls over one of them, the load travels through the sand-filled joints into its neighbours. How well it travels depends on how many neighbours each block has and whether the joints form long straight lines across the area.

In stretcher bond the joints run straight through in one direction. Under a braking or turning wheel the whole course starts to creep, because nothing stops it. Herringbone is turned through 45 or 90 degrees and no joint runs straight across the paving, so a block has nowhere to go. That, and nothing else, is why herringbone is the pattern specified for anything a vehicle uses.

The same logic covers modular layouts: three sizes alternating in one repeat never build up a long continuous joint either. Basketweave sits in between — square, tidy, and fine on foot, but the joints line up in pairs and it will move if you park on it.

The table above covers what gets laid most often. Manufacturer ranges and real driveways will also throw these four at you, and each one solves something different.

Herringbone 45° versus 90°. Same pattern, just turned against the edge of the area. The 90° version runs parallel to the edge, so it lays faster and cuts less. The 45° version sits at an angle to the direction of travel, so no course points where a braking wheel pushes. That is why it goes on driveways, even though you pay for it with angled cuts round the whole perimeter.

Basketweave. Pairs of blocks alternate flat and upright like a chequerboard. It reads as woven, it looks right on a path or patio, and it cuts very little. Do not expect it to carry a car though: the long joints between blocks take away exactly what gives herringbone its strength.

Diagonal laying. Not a pattern of its own, but any of the above turned through 45 degrees. It breaks up a narrow area visually and pulls the eye off walls that are not parallel, which helps on yards that were never square. The price is more cuts, so allow the same as herringbone.

Wave block (S-block). The curved sides interlock in every direction, not just along the course. The surface stays put where the edge is not ideal, and no single block can be pushed up out of it. It lays quickly because the shape sets the joint for you, but cutting at the edge is more of a nuisance than with a rectangle.

Herringbone and basketweave share one condition: the block must be 2:1, its length covering two widths plus one joint. A standard 200×100mm block fits; a 300×300mm square cannot close this pattern. The editor checks it and warns when the size does not work.

Waste is made at the edges, where the pattern has to be cut in. A pattern running parallel to the sides of a rectangle needs cutting on two edges only. A 45° herringbone has to be cut all the way round the perimeter, and every angled cut leaves an offcut you will not use anywhere else.

The calculator starts at 8%, which is safe for most jobs. On a plain rectangle laid straight you can take it down to 5%; on 45° herringbone, on a circle kit, or on any area with bays and corners, put it up to 10%. Over 50 m² that difference is a full pallet — and a pallet bought later comes from another batch, in a slightly different shade.

When you cut, keep to the rule that runs through the standards: lay no piece smaller than 30% of a whole block. Thinner slivers crack under the plate compactor and lift out after the first winter. If the setting-out lands you on a thin strip, shift the whole pattern by half a block and take one out of the opposite course.

A pattern never starts in the middle of an area. Pick one edge that whole blocks will run from and leave every cut for the opposite side. That edge should be the one people see: the threshold, the step, the front of the patio by the doors. The cut edge then ends up where nobody looks — against the fence, against the wall, under the car.

The setting-out in the software works the same way. You pick a reference edge and the whole grid follows from it, so before the first block goes down you can see where the cuts land and whether a thin strip is waiting for you anywhere. Without a chosen edge the program takes the longest edge of the area, which is a fair guess but not always the side anyone actually looks at.

Where two areas meet — a patio and the path to the gate, say — pick the edges so the joints carry across. When the grids of two areas are a few centimetres out, the transition reads as a mistake even though both areas on their own are laid well.

Below roughly fifteen square metres, stop thinking about strength and think about scale. A large repeat such as double basketweave or a modular three-size needs distance for the eye to read it as a pattern; on a small yard all that is left is a restless jumble. Finer bonds work on two metres just as well.

A long, narrow area has the opposite problem. Stretcher bond run along it makes it longer still, because the continuous joints lead the eye straight to the far end. Turn the courses across it, or go to diagonal laying — on corridor-shaped yards that is the cheapest trick there is.

An area broken up by tree pits, manholes and the corners of the house calls for a simple pattern. Every cut-out means cutting right round it, and with herringbone or a module those are angled cuts on top. On an area with three cut-outs, choosing a simpler bond saves you more than the whole of the rest of the job.

Deal with falls independently of the pattern. The surface has to shed water whatever it is made of — 1:60 as a minimum, 1:50 preferred. The pattern will neither rescue nor ruin the fall, so do not be talked into the idea that some bond „drains better“.

One or two courses right round the area, laid differently from the field — usually soldier course or a larger format. It is not just decoration. The pattern gets cut against the edging rather than against the ragged edge of the dig, so the cuts are shorter, straighter and there are fewer of them.

It pays most on patterns that would otherwise need an angled cut all the way round: herringbone at 45°, diagonal laying, a circle kit. With stretcher bond it is largely an aesthetic decision, because there would be few cuts either way.

The other thing an edging course solves is the transition between two patterns. Two different grids never meet on a clean line; put a soldier course between them and the boundary looks deliberate. Without it, it looks like somebody ran out of blocks.

The difference between patterns is not only in the material. Stretcher bond is the fastest, because it goes down block by block with no turning. Herringbone is roughly a third slower, because every other block has to be turned and the courses need checking as you go so the pattern does not start to wander.

Fans, circles and random bond are hand work and cannot be compared with stretcher bond on time at all. When a customer wants one, put it into the rate per metre rather than quietly absorbing it — otherwise you pay the difference yourself. Going rates for laying are in the paving labour rates.

Add cutting to the laying time. An angled cut takes longer than a square one, and with a module there are several times as many of them round the perimeter. Over 50 m² the difference between stretcher bond and 45° herringbone is comfortably half a day of extra work.

The pattern started from the wrong edge. Whole blocks ended up at the fence and cut ones at the threshold. The only fix is lifting it, so it is a five-minute decision that costs a day of work.

A thin strip was left at the edge. Pieces narrower than about a third of a whole block crack under the compactor and lift out after the first winter. If the pattern lands you on a strip, shift the whole grid by half a block and take one out of the opposite course.

Pallets were only mixed at the end. Shade varies between batches and, with concrete blocks, within a single pallet. Take blocks from three pallets at once from the start; if you begin doing it in the last third of the area, the change will show for good.

The pattern was picked from a photo, not from a size. Herringbone looks the same in a picture whatever block sits underneath it. With the wrong ratio it drifts apart after a few courses, and by then you cannot catch it up.

Load and shape decide it. The heavier the traffic, the sooner you go to herringbone; the narrower and more broken-up the area, the simpler the pattern should be, because every corner is another set of cuts. Set the pattern out before you order the blocks, not after — ordering short and topping up is how you end up with two shades on one driveway.

One thing worth saying to customers who are choosing on looks alone: the pattern is the smallest part of whether the job lasts. What carries the car is the sub-base underneath and how well it was compacted.

To see what a given pattern costs you in blocks once waste is added, run it through the block paving calculator, and read the step-by-step laying guide for the order of work on site.