Bathroom floor trap and waterproofing: choose the trap before the grate
A floor trap chosen by the look of its grate can turn out too deep, restrict flow, conflict with the slab or sit above the required floor gradient, and the waterproofing around it can fall between the plumber, the tiler and the main contractor.
Choose in this sequence: drainage location, pipe diameter and depth, required flow, anti-odour or backflow function, the waterproofing interface, tile thickness and gradient, and only then the visible grate. Match the trap to its use (shower, general floor, washing machine or backflow risk) and record its outlet size, direction, installation depth, flow capacity, removable hair strainer and anti-odour mechanism; any figure not yet known is set per project. List waterproofing as its own package.
A trap that is too deep, restricts flow or sits above the required gradient is not fixed by changing the grate. Waterproofing responsibility must not disappear between the plumber, the tiler and the main contractor, so it is listed as its own package.
Confirm the component before you finalise this detail.
This detail depends on the component's dimensions and how it is fixed. Confirm the component before finalising the construction detail.
Before it is finalised, establish:
- Dimensions
- Compatibility with the substrate or system
- Availability and lead time
- Sample needs
ELS Source is a related specialist supply service. Suitable alternatives may be used if they meet the specification.
Supply is subject to suitability and quotation. Using ELS Source is optional, and this page states no stock, price or lead time.
ELS Source is a separate site with its own terms, including who it quotes. Nothing is sent to it from this page.
For ALUMAX products, ALUMAX remains the route.
Written for planning, not construction. Confirm every dimension against your approved project drawings.
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