Many DIY bathroom renovators mistake this step as being simple. It is NOT! In fact it’s one of the most intricate steps of the entire bathroom renovation and unless it’s done perfectly it can lead to major rectification works as well as damage to the vanity and bench top. But if you’re confident you can do it then let’s start.
Now to start off:
Use a measuring tape and pencil to mark out on the floor where you want your vanity. Then work out the position of your waste and water pipes. Measure from the edge to where you want the drain placed. The drain can be positioned anywhere in the cupboard side of the vanity. If it is a draw vanity only, the draws generally allow a void for the drain in the middle. Make sure you work this out according to the vanity unit you have. Once the bottom is cut out (using a core drill) get the measurements from the back wall to the taps. Cut these out accordingly using the same method.
Place the vanity along the wall. Check that it is level, then use your drill to put two screw holes through the backing of the cabinet and into the wall. If your bathroom is timber framed, ideally you want to locate the studs to ensure maximum strength. Now push wall plugs into the holes, trim them to length with a knife (so they don’t protrude) and drill the screws through the cabinet into the wall. Make sure you use appropriate length screws. Generally, 50mm is adequate. Check your vanity is still level, insert your drawers back along the track.
Run a bead of silicone along the top edges of the vanity base. This is to ensure the basin bonds correctly and doesn’t leak. Place your basin onto this and push against the wall. Once this has bonded, proceed to silicone the gap between the basin and the wall. The appropriate method of installing silicone is generally to run a thick bead, spray with soapy water than wipe down with your finger. The soapy spray is used to ensure the silicone doesn’t stick to your fingers and can be spread out easily. This step will prevent any future leaking from the basin.
Now you want to reconnect the plumbing! Make sure you use Teflon tape around the connections to keep them tight. Proceed to install the basin mixer or taps with the appropriate plumbing.
When installing the drain, make sure there is a trap! This will prevent any smells entering the vanity.
Remember all work must adhere to the AS standards. If you live in NSW the AS standard code is AS. 3500.