Plumbing A Bathtub
Whether you re adding a bathtub to a new bathroom or an existing one you ll need to connect the bathtub plumbing to the rest of the drainage system and you ll need to install a water supply.
Plumbing a bathtub. You will have to cut holes in the floor so that you can run the pipes to the fixtures so determining the exact placement is important. Because of the way bathtubs are built you can t simply run the bathtub drain line vertically down from the drain opening. The bathroom sink rough in dimensions are as follows. This will determine where you will need to run the plumbing lines.
If you have to hold your drain lever down for the tub to drain it is more than likely the tension spring on the back of the overflow plate. You will need to figure out the placement of your bathtub or shower sink and toilet. Here are a few bathtub drain schematics and bathtub plumbing diagrams. The bathroom plumbing rough in dimensions you need to know.
Also notice the drain is centered right in the middle of this 30 inch vanity.