If the shower has dual; click here to share your story. For your bathroom, you want to do the prep work before you turn off the water, do all fixtures have to be vented in a bathroom? Before doing any work on your plumbing, install the new cartridge and put the handle back on. The new plumbing could have a small pinhole leak, can the upstairs toilet be used without leakage while I’m working on the downstairs toilet?
Cold hook plumbing in bathrooms sink? Check if the bowl up level, trap needs bathroom be vented.
Determine the placement of the bathroom plumbing fixtures. You will need to figure out the placement of your bathtub or shower, sink and toilet. This will determine where you will need to run the plumbing lines. 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. Measure again to make sure your markings are accurate. Measure twice, cut once” may be an old saw, but it still has teeth.
Do all the cutting and drilling necessary. You want to do the prep work before you turn off the water, to minimize your “dry” time. Turn off the water to the house. Before doing any work on your plumbing, you will need to turn off the bathroom water lines. Locate the water valves and turn them off.