03 — Series / TRAP
TRAP — where the smell would come from
A seal that dries out is not a seal. In rooms that go days between washes, say so — the answer is a different trap, not a bigger one.
TRAP — fixed parameters
Section
A gully whose job is the seal, not the flow. The cartridge lifts out for cleaning and drops back in one position, so the depth is the same after every clean. Depth is measured on the assembly, with the basket in place.
How this series fails
- A shallow body chosen to fit a thin slab: the seal is what got cut, and the room pays for it.
- A cartridge that can be refitted the wrong way round — it will be, once.
- A seal relied on in a room that is dry five days a week. No depth survives that.
What decides the size
- Depth of construction available below the slab
- Days between washes — this is the question that decides the cartridge
- Whether the discharge is gravity or pumped
- Whether the room is also a traffic route, which decides the grate
Structure only — not published
- Dimensions: length, width, depth, outlet position and build-up height — issued on the dimension sheet per project
- Load class for each grate variant, once tested
- Assembly photographs, once the shoot is done
- A worked example with a run length, a fall and an outlet, as a downloadable section