Edge profiles for stone and solid-surface tops

At a glance

Names as seen in two UK fabricators’ edge lists (one porcelain, one stone), read 7 Nov 2026. Neither list gives sizes: the geometry column is ours.

Name it by its section, not its word

An edge profile is a section through the front of the top, and the names for it are not standard. We read the edge lists of two UK fabricators, one working in porcelain slabs and one in stone and engineered surfaces. They overlap but do not match: one has half bullnose, shark nose and a special shark nose; the other has pitched, bird’s beak and ogee. Neither gives a radius or bevel size. We found no standard that defines an edge profile by its name. So the first rule is to dimension the profile on the drawing and not to trust the word.

The sheet drawing shows eight profiles through a 30 mm top at one scale. The radii and chamfers are examples, set in the drawing so the shapes read, and are not standard sizes. One thing is geometry, not convention: a full bullnose has a radius of half the thickness. The table gives the arithmetic.

The apron drop of 30 mm is an example. The fabricator’s built-up edge page says 20 or 30 mm material can be made to appear 50 mm, 75 mm or thicker, in natural stone, engineered quartz or sintered stone.

What the stone and the thickness can take

Which profile suits which thickness is a question for the stone partner, because the answer depends on the stone and on what the edge has to survive. The porcelain fabricator lists its profiles for 6, 12 and 20 mm tops, and a mitred apron or full cladding for 26 mm and over, up to 100 mm. It also says that, to improve the impact resistance of exposed edges on worktops and islands, one of its listed profiles should always be used, and that non-exposed edges need no polishing. That is one maker, for porcelain, and it is a useful question to put to any partner: what edge do you recommend on this material, and why?

• The stone. Ask for the flexural strength result (BS EN 12372 or 13161) and the absorption result for the slab, and whether veining, fissures or cleavage in this slab affect an edge or a mitre. No source we read says how much, so ask.
• The thickness. A full bullnose takes its radius from the thickness, so on a thin top it is a small round. A built-up edge makes a thin top read thick, at the cost of a joint.
• The use. An edge on a bar front, a reception desk or a dining table is touched, knocked and sat against. A sharp arris is more exposed to chipping on any brittle material, which is common trade experience and not a figure we can source.
• The finish. The edge is finished to match the face, or deliberately differently. A polished face with a honed edge is a decision, not an accident: see natural stone finishes.

Build-ups, mitres and waterfalls

A built-up edge, a mitred apron and a waterfall all join pieces of stone, and the joint is the thing to specify. The second drawing shows the sections.

• Laminated edge. A second strip is glued under the top, so a 20 mm top reads thicker. The glue line is visible on the underside of the edge, and the strip and top may not match in veining.
• Mitred apron. A vertical piece is joined to the top at 45° at the front arris, so the face reads as one thicker slab and the grain or vein can run round the corner. The fabricator’s page describes this as how the look of a thicker worktop is made.
• Waterfall. The top turns down a leg. The porcelain fabricator says a mitred waterfall leg must be fixed to the base unit and be the same thickness as the worktop, and that a butt-jointed leg must be fully attached to the base. It also warns against excessive weight on an overhang or standing on the top.
• Vein matching. A mitre wraps the vein round the corner only if the slabs are cut and sequenced for it. That is a slab-selection decision: see stone sample, slab and book-match approval.

Solid surface: the maker’s guide governs

Solid surface is a different case: the edge is built up and shaped by the fabricator, and the manufacturer’s fabrication guide governs. One US maker’s published figures, in a technical data sheet dated 2009 and revised 2012, and a V-grooving guide revised in 2020, show the kind of rule to ask a partner for. They are for that product and are not a standard.

The BS EN ISO 19712-1:2013 listing names the properties of solid surfacing (including water, stain, chemical and heat resistance), but we did not read it. Ask the partner for the maker’s fabrication guide for the product you are specifying.

Cut-outs, overhangs and off-site work

HSE’s page for installers of stone worktops (updated 16 January 2025) asks that cutting, shaping or polishing is done in a suitably equipped workplace before the top arrives on site, that sink and tap holes are cut off site, and that optional work such as drainage grooves is checked against the works specification so that it is done off site. It does not mention edge profiling by name. Edge work on engineered stone and on some natural stone makes the respirable silica dust that the engineered stone and silica guidance sheet describes, so the specification should say that profiles are cut in the workshop with the partner’s dust controls.

• Cut-outs. A sink or hob cut-out is a notch in the edge system. The porcelain fabricator says to support the weight of a full sink on the base, not on the top, and to reinforce the underside round the sink.
• Overhangs. The permitted overhang depends on thickness and on cut-outs, the porcelain fabricator says. Published figures for stone are mostly secondary and disagree, so we give none: the partner or a structural engineer sets the overhang for the stone and the load, above all where people sit.
• Standards. No edge standard was found. BS EN 15388:2020 (vanity and kitchen tops in agglomerated stone) is listed as Current but covers product properties, not edge geometry; Stone Federation GB sells a Code of Practice for kitchen worktops that we have not read.
• Approve an edge sample. Cut the profile on an offcut of the approved slab, at full size, and approve that. See sample hierarchy and approval.

Exposed edge profile: [pencil / eased / bullnose / bevel / mitred apron] as shown on drawing [no.], dimensioned [R __ mm top and bottom / chamfer __ x __ mm / apron drop __ mm]. Arrises eased to [R __ mm]. Edge finished to match the [face / ] finish [or: honed edge to polished face as sample no. __]. Edge profile sample cut full size on an offcut of the approved slab and approved before production.

Mitred or built-up edges to be cut from the same slab as the top, sequenced for vein continuity [as shown on the layout drawing]. Joints to be [colour-matched adhesive], tight, and shown on the shop drawing. [Waterfall legs to be the same thickness as the top and fixed to the base unit as detailed.] Overhang [ ] mm maximum unless supported as detailed.

Edges, cut-outs and drip grooves [position __ mm from the edge, __ mm wide, __ mm deep] to be formed in the partner’s workshop and not on site, with dust controls. Internal corners of cut-outs radiused [__ mm] and reinforced as the manufacturer’s fabrication guide requires.

Standards and sources

• BS EN 15388:2020; BS EN ISO 19712-1:2013; BS EN 12372:2022; BS EN 13161:2008; HSE, Installing stone worktops (16 Jan 2025); two UK fabricators and one US solid-surface maker: Standards Current on BSI Knowledge (6 Nov 2026); none gives an edge profile; texts not read. Documents read 7 Nov 2026.

Questions we are asked

What is the difference between a pencil edge and a bullnose?

A pencil edge puts a small radius on the top and bottom arrises and keeps a flat face between them. A full bullnose is a half-round whose radius is half the thickness: 15 mm on a 30 mm top. Fabricators’ sizes for a pencil edge and a half bullnose vary, so dimension them.

Can a 20 mm stone top look 50 mm thick?

Yes, with a built-up or mitred edge. One UK fabricator says 20 or 30 mm material can be made to appear 50 mm, 75 mm or thicker, in natural stone, engineered quartz or sintered stone. The price of that look is a visible joint and the need to sequence the slabs for the vein.

Is there a standard for edge profiles?

We found none that defines a profile by its name. The edge lists of the two UK fabricators we read differ and give no sizes. Dimension the section on the drawing and approve a full-size edge sample.

How far can a stone top overhang?

It depends on the stone, the thickness, any cut-outs and the load, above all where people sit. The figures published for stone are mostly secondary and disagree, so the partner or a structural engineer should set it. One solid-surface maker publishes 152 mm for 12.7 mm sheet, which is for that product only.

What is a drip groove and does it need specifying?

It is a groove cut in the underside of an overhang to stop water running back along the underside. HSE treats drainage grooves as optional work that should be cut off site, so write the groove, with its position, width and depth, into the specification and the shop drawing.

Should a waterfall leg be mitred or butt jointed?

The porcelain fabricator we read says a mitred leg must be fixed to the base unit and be the same thickness as the top, and that a butt-jointed leg must be fully attached to the base. A mitre carries the vein round the corner if the slabs are sequenced for it; the partner advises which is feasible in your stone.