- Apply a line of bathroom silicone to the underside of the basin centered between the perimeter of the basin and the waste hole.
- Press the basin down onto the benchtop lining the waste hole with the cutout in the vanity top.
Note that the hole in the vanity top can either be cut larger than the waste hole (90mm would be suitable for most basin wastes) or the same size as the waste hole in the basin. Depending on the size of the hole cut the waste basket would either be screwed to the basin only, or the basin and the vanity top. The reason you may screw to both the basin and vanity top is if the waste basket is unable to screw down small enough to clamp onto the basin by itself. Follow the advice from your plumber on what installation method works best for you.
- Apply a line of silicone around the edge of the basin where it meets the benchtop.
- Apply a generous line of silicone around the waste hole and place the basin waste evenly into position. It is important that there are no gaps for water to enter. Silicone should squeeze out the sides when the waste is pushed down.
- Alternatively, install the basin waste as per the manufacturer instructions. Often rubber, silicone or foam gaskets are provided.
- Install the lower half of the waste from underneath the benchtop and HAND TIGHTEN. DO NOT overtighten.
- If necessary, apply a thin layer of clear silicone over the join between the basin and waste basket.
- Use a silicone scraping tool or soft cloth to wipe away all excess.
- Leave for 24 hours for the silicone to completely dry.
- Check to ensure that water flows properly down the waste hole.