1. Preparation

We recommend that components are trial-assembled before installation to double-check compatibility. If used, screw the spigot adaptor into the body outlet using a suitable sealant to ensure a watertight joint.

2. Measure distance to finished floor level

Ensure the distance between the finished floor level and the top of the pipework is sufficient to fit the completed floor assembly. This distance should enable the complete assembly (with extensions, if applicable) to be installed so that the top face of the grating or cover finishes at the finished floor level. If using side inlets ensure their position allows a fall to the gully. The body must be installed with the top of the flange at or below membrane level.

3. Install body

Connect body (with spigot adaptor if applicable) to the pipework. All our bodies can be used in solid floors. Use a wide flanged body for timber decks. The flange can be drilled for fixings or use an underdeck clamp (33.9610 or 33.9620) to fix assembly. If the deck is recessed for the flange, consider the need to reinforce the cut timber edge.

4. Dress membrane and fit clamp

If used, dress the membrane over the flange to the edge of the body sump in accordance with the membrane manufacturer’s instructions ensuring the membrane does not restrict the outlet or threads for the grating. Bolt the membrane clamping collar to the body. Thin membranes may require the screw length to be reduced.

Note: Some clamps are reversible to increase height adjustability to the finished floor level. In some cases, e.g. large sump bodies (31.1024 etc), the membrane clamp must be used as it connects the grating to the body.

5. Install Grating

Fit grating or rodding eye to the body ensuring the surface is at finished floor level using the height adjustability of the top. With square gratings ensure the body is rotated so any height adjustment of the grating allows it to align with tiles or paving. Use screws provided with cam-type height adjustment to lock the grate at the required level.

6. Finish floor

Lay floor screed and apply the floor finish around the grating or cover. Fit removable accessories, e.g. funnels, sediment buckets etc. If sheet vinyl flooring or similar is used dress the finish over the grating bezel and clamp using the in-built clamp ring.