A curve is set out before it is laid
Curved paving fails at the setting-out stage far more often than at the laying stage. Somebody judges an arc by eye on site, the radius drifts, and every course after it inherits the error. On a Bermuda property, where a court may be compact and enclosed by walls on two or three sides, there is no spare ground in which to lose the geometry and quietly recover it. Fix the center, fix the radius, and mark both physically before the first unit is bedded. A curve also has to answer to the things around it, so take the positions of gate posts, wall faces, drain outlets and door thresholds into the same drawing. Those fixed points, rather than the shape you had in mind, usually decide where the arc can honestly sit.
Why small units turn
A curve is a sequence of very small straight lines. The shorter each unit is, the smaller the angular step between one piece and the next, and the tighter the radius a surface can hold before joints open into wedges. That is the reason setts are the standard answer for radial work, and it is why a large slab has to be cut into a curve rather than laid into one. Unit length, not stone type, is the variable that decides how tight you can go. Joint width is the second variable and it works with the first: a slightly wider joint lets a longer unit turn more sharply, while a tight joint demands a shorter one. Settle both together on a sample panel and the drawing stops being wishful.
Fan and arc coursing
Radial coursing places the joints where the eye expects them on a turning surface, and it makes an arc look intended rather than tolerated. It also demands more setting-out discipline than a straight bond, because every course is struck from a fixed point and any drift compounds outward. Read how each bond behaves on site before deciding, since the layout drives both the cutting schedule and the labor hours.
- Strike every course from the same protected center mark, not from the last one.
- Check the radius at intervals instead of trusting the course just laid.
- Decide where the fan begins and ends before the first ring is bedded.
- Dry-lay the tightest arc first to prove unit size against joint width.
Where a straight bond gives up
Running bond and stack layouts are efficient on rectangles and awkward on almost anything else. The failure points are predictable enough to check for at drawing stage.
- Courses meet the curve at a shallow angle and produce thin, fragile slivers.
- Cut edges accumulate along one boundary and read as a ragged seam.
- Joint widths open unevenly as the coursing fights the radius.
- Waste climbs sharply because most cuts are one-offs rather than repeats.
Courts, circles and the center point
A circular court is the easiest curved layout to build well and the easiest to build badly, and almost everything depends on the accuracy of the middle.
- Establish the center as a physical marker that survives the whole works.
- Lay the first ring true, because every ring after it repeats that ring’s error.
- Decide early how the circle meets the field: border, frame or blend.
- Keep a crossfall through the circle so water leaves rather than pooling.
- Check the ring count against unit size before ordering, not afterward.
Cutting, waste and the order
Curved schemes consume more stone than their measured area suggests, and the extra is not spread evenly across the job.
- Add an allowance for cuts on every curved boundary, not on total area alone.
- Order border and field from the same batch so tone runs consistent.
- Keep offcuts sorted, because small pieces solve junctions later in the job.
- Expect breakage on thin cuts and carry that in the ordered quantity.
Local constraints that shape geometry
Two Bermuda conditions push curved geometry around. Access is the first: narrow lanes and vehicle-size limits mean pallets arrive on smaller trucks and often cannot be set down beside the work, so setting-out marks have to survive barrowing back and forth across the site. Drainage is the second. With roof-caught rain in regulated tanks providing the domestic supply, a court has to shed water somewhere deliberate, and a radial layout makes it easy to forget that a circle still needs a fall. Decide whether that water is destined for a collection route or kept clear of one, then hold every cleaning and sealing decision to the same answer. Enclosed courts add a third pressure, since a walled yard on a subtropical North Atlantic island holds damp through the cool months and a surface that cannot drain will show it.
Draw it, then order it
The cheapest hour on a curved job is the one spent on paper. A dimensioned setting-out drawing gives you the ring count, the cut count and a quantity you can trust, and it turns a vague area figure into an order that arrives complete. It is also the document a laying gang can work from without guessing, which saves time at exactly the point where curved work usually loses it. Send the drawing with the radius marked and ask about the sett sizes a curve needs before the pattern is signed off. Get the center right and the curve takes care of itself.