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Vanity plug and washer waste with overflow:
If the vanity basin has an overflow you either have to use a two-piece plug and washer waste or a plug and waste with overflow holes in it.
If the two-piece waste simply silicone seal the top most section and the bottom section and attach using the long screw provided between the two sections through the basin waste cavity. If using the one-piece version silicone seal the top. Then whilst holding the waste in position turn the basin upside down and place silicone around the long thread where it meets the very bottom of the basin where the washer and the back nut go. Tighten and clean the silicone off the inside of the basin and you are done.
Once this is done place the P-trap onto the plug and waste and after considering fall into the wall place a pencil mark where you need the center of this 90-degree bend to come out of the wall.
Or if you are going to be bringing the waste pipe up through the floor place an S-trap on the bottom of the plug and waste and mark where it will travel through the shelf and down and out through the toe space shelf and through the floor.
If positioning a waste pipe for a pedestal basin and you want the P-trap to keep it all nice and tidy out of the wall. Run the waste pipe before you run the wingbacks for the hot and cold water. It is much easier to run these around the waste pipe than try and run the rigid waste pipe around the water piping noggin timberwork. Also Please Note: Install a timber noggin to take the large coach bolt kit to take the extra weight of a pedestal basin. The hole drill for these is half the diameter of the bolts thread size. And they each have plastic washers that enable the offsetting of the level of the basin to be accurate to level it straight every time.