Short answer
Four things change on a rooftop: the load, the access, the wind, and the fact that it is usually a commercial or multi-occupancy setting. Those four decide the specification before the layout does.
Weight and load
A rooftop has a structural limit. Stainless cabinets are light relative to stone worktops, and on a rooftop that difference is often decisive — a 4 m stone worktop on an upper floor is a crane lift and a load calculation.
Get the load figure from the building before choosing the worktop. It is the one constraint that cannot be designed around.
Access
A roof terrace has no garden gate. Modules that go in through a lift have to fit the lift, and modules that go up a stair have to turn a stair.
This is often the reason a run is specified in shorter modules — not aesthetics, access. It is worth photographing the lift and the route before the module list is finalised.
Wind
An exposed rooftop is where a lightweight cabinet run can actually move. Modules bolt together and stand on castors, which is fine in a garden and marginal at 20 storeys.
For exposed rooftops we specify an anchor kit. Whether a specific site needs it depends on the exposure, and we will say so rather than selling it as standard.
The warranty position
A commercial or multi-occupancy rooftop does not get the residential warranty schedule. Cabinets in a public or semi-public setting are warranted on delivery and against factory defects at acceptance.
This is stated up front because it is a genuine reason a project may choose a different supplier, and nobody should discover it after the purchase order.
What a rooftop changes about the specification
Wind, not rain
A terrace above the surrounding roofs has no shelter from the prevailing wind. Burner flames and loose lids are the practical problem, not water.
Getting a pallet up there
Craning, hoisting or a goods lift, booked before production. This is the line that delays projects most often.
Weight over a slab
A full run plus a stone counter is a point load on a structural slab. The structural engineer's figure comes before the layout.
Drainage that already exists
A roof terrace usually has a fall and a drain. The run has to sit inside that fall, not on top of it.
Salt and pollution together
A city rooftop is dirtier than a garden. 316 is worth discussing where the building is close to the coast.
Questions we get about this
Can the cabinets be craned onto a roof?
Yes, and it is common. The modules are crated for export and can be lifted. What matters is the weight per crate and the landing space, both of which we can give you.
Do rooftop installations need anchors?
Often yes. Bolting modules together is not the same as holding them down, and an exposed rooftop needs the second. Ask for the exposure assessment with the quote.
What warranty applies?
Not the residential schedule. Delivered-and-accepted warranty against factory defects. The terms page states it in the same size type as everything else.
Before you order anything
Send the grill model and the run length. You get the aperture, the module list and one itemised price back in writing — freight shown separately, valid 15 days.