Question 1

What drives a granite pool coping price, and why does it cost more than a kerb of the same thickness?

Accepted Answer

A granite pool coping price is driven by processing, not stone: bullnose pool coping is quoted by the meter of edge work, not by the square meter of material. Take a 30mm coping, 300mm wide, with a 100mm drop face — an example, not a standard section; your drawing decides it. One linear meter holds 0.03×0.30×1 plus 0.03×0.10×1, which is 0.012 m³, or roughly 32.4 kg at 2.7 t/m³. Put your own three dimensions in place of 0.03, 0.30 and 0.10 and the arithmetic carries over unchanged. Stone is one line on that invoice; the rest is processing. Ask the factory to split the rate into stone, forming and polishing: the stone line checks back at 0.012 m³ times the block price you were quoted, and the other two are what actually differ between suppliers. Three operations move the number. Forming the bullnose, where a profile wheel grinds a square arris into a half round over several slow passes. Polishing that arc, which is harder to keep even than a flat face and gets slower the fuller the radius. And hand-fitting the corner pieces. So do not open with "what is your rate per meter". Open with "which bullnose, is the arc polished, and how are corners counted". At our works, 20 block saws and 500,000 m² a year mean sawing is never the queue; the edge and arc line is.

Question 2

Why is pool coping almost always bullnosed, and which profile should I specify?

Accepted Answer

A round edge is a durability decision before it is a visual one. A square arris chips the first time something is dragged across it, and the fractured face holds dirt far better than a polished one. Bathers also push off the coping with shins and knees, so a radius spreads the load instead of concentrating it on one line. Five profiles cover most pools: square with a small chamfer; single bullnose on the top arris only; double bullnose on both arrises, usual on freestanding walls and spa surrounds; full half-round for a wide sit-on coping; and an L-profile with drop face that caps the pool wall and hides the waterline tile. Drop-face height is the dimension people get wrong. It has to meet the finished level of the pool lining, and a few millimeters out becomes an open joint all the way around.

Question 3

The coping is wet most of the year. Which surface finish keeps it from getting slippery?

Accepted Answer

Polished is the wrong choice at a pool. Three finishes do the job, in order of grip. Bush-hammered gives the strongest texture and still bites when wet, but the texture traps scale, and on a light stone that shows badly. Flamed has a finer grain, a softer feel underfoot, and is widely used poolside — but do not pick it from a photo: ask for bush-hammered, flamed and sandblasted samples off the same block, wet them and walk on them. Sandblasted sits between the two, even and not sharp, which suits pools that children use. Grooved is the most direct anti-slip treatment, but the channels hold water and dirt, so it is a poor fit for a full coping run. One detail gets missed on nearly every job: the bullnose must carry the same finish as the top. A polished arc under a flamed top cuts the coping into two visual bands, and it is the first thing an inspector picks up. Polish also throws glare in direct sun, which is a second reason it does not belong outdoors.

Question 4

Will chlorine and weather discolour a white granite like Wave White, or cause efflorescence?

Accepted Answer

The stone itself is not the weak point. Granite has low absorption, chlorine at pool concentration does not penetrate it, and most of what gets blamed on the stone happens somewhere else. Three places fail first. The joint sealant ages and blackens under water and UV; the dark line around most pools is that, not dirty granite. The joint between drop face and waterline tile lets water behind the coping if the face does not genuinely overlap the lining, and it shows up later as a damp halo on the front edge. Then there is the colour: pale granites such as Wave White (G418) make calcium marks from evaporating pool water far more visible than a dark stone does. Three responses: a weather-grade sealant instead of cement-based grout, a drop face that laps the tile, and a penetrating sealer before handover, since a film-forming sealer will peel. Decide up front whether you will clean the coping once a year.

Question 5

Why do corner pieces cost so much more than the straight runs?

Accepted Answer

Straight runs are cut and ground; corners are set out and fitted. A straight length is a continuous operation: saw to length, square the ends, run the profile wheel along the top. Every corner, though, has to be laid out on its own, and the profile has to meet in both directions: the four turns of a rectangular pool, step returns, a diving platform, the mouth of an overflow. Either the two lengths are mitred and the joint lands exactly on the arris, which is where chipping starts, or the corner is cut from one block with a radius worked in, which wastes material and can only be finished by hand. A quote that states only a rate per meter will recover all of this later as a per-piece charge, with no ceiling. Ask for linear meters and corner pieces on separate lines, with a setting-out drawing per corner. The more irregular the pool, the bigger that share: a freeform pool is almost entirely corner work.

Question 6

What has to be written on the order so nothing is discovered at delivery?

Accepted Answer

Six items, filled in line by line and sent back, not agreed over the phone. Packing is the one that gets dropped. The bullnose is the thinnest part of the piece, and in a stack the weight above lands directly on the arc below, so a chipped nose at unloading means a site repair with adhesive. We crate coping separately, edge up, with soft separation between layers. Our 100 m² minimum and 5-day lead time apply to standard slab work; profiled and faced coping is scheduled on its own line, so slab lead times do not transfer. The plant is in Cenxi, built in 2019, with the quarry and the yard on the same site, so changing a profile does not mean moving stone between factories.

Profile	How it is made	Where it belongs	What to ask on the quotation
Square with chamfer	Sawn, then one chamfer pass	Rear edge against paving	Is the chamfer inside the meter rate
Single bullnose	Profile wheel on the top arris	Standard residential coping	Forming and polishing, one charge or two
Double bullnose	Both arrises formed	Freestanding walls, spa surrounds	Both arcs polished, how is it priced
Full half-round	Wide radius, multiple passes	Wide sit-on coping	How many passes per meter, and how is the time counted
L-profile with drop face	Two cuts plus an internal corner	Capping the pool wall	Internal corner and face polish, itemised or included

Item on the quotation	What it has to say	What happens if it is left out
Section	Thickness × width plus drop-face height, figures off your detail drawing, never "standard"	Cut to a default section and the drop face misses the lining level
Profile	Which bullnose and what radius, with a profile drawing attached	Falls back to the cheapest chamfer
Finish	Whether the face and the top take the same finish, named	Flamed top with a polished arc is the first thing rejected
Corners	Piece count plus a setting-out drawing per corner	Priced by the meter now, charged by the piece later, no ceiling
Joint	Sealant or mechanical fixing, and who sets the gap	Each trade decides on site and gaps end up uneven
Packing	Crates of their own, edge up, soft separation between layers	Arc on arc, a chipped nose at unloading and adhesive on site