90mm Square Floor Wastes for Showers and Bathrooms

A 90mm square floor waste is a common size that suits the crisp, squared-off drainage layouts used in many modern bathrooms. The square face lines up neatly with rectangular tiles and straight grout lines. This guide covers where a square waste fits and what to check before buying.

Why square, and why 90mm

A square grate aligns with the straight lines of rectangular and large-format tiles far more comfortably than a round one, which is why it’s a natural fit for contemporary bathrooms. At 90mm the face is compact enough to sit discreetly yet large enough to clear a shower’s flow. If your tile layout is grid-based, squaring the waste to the grout lines makes the drain look intentional rather than dropped in.

Setting it into the floor

Set the frame flush with the finished floor and fall the surrounding screed evenly toward it so water clears without pooling. Getting the waste square to the tile joints before the adhesive goes off is the difference between a neat result and one that looks slightly off. A removable grate makes clearing hair and debris straightforward once the bathroom is in use.

Outlet, flow and finish

Confirm the outlet size and whether a centre or side outlet suits your plumbing, and check the flow rate is adequate for a shower rather than just a floor drain. Match the grate finish to your other fittings for a joined-up look. To compare square wastes and finishes in person, browse the range of bathroom accessories at Just Bathrooms, a local showroom on the NSW South Coast.