How To Re-route Bathroom Plumbing

Re-routing the bathroom plumbing is not an easy project to handle. You need to have plumbing knowledge to be able to do this task. You should also consult your local building code if you are allowed to do this on your house. If you are renovating your bathroom to either maximize the space or change the layout, here are the things you need to do to re-rout your bathroom plumbing.

  • It is best that you look for the plan for indoor plumbing system for your bathroom. This will help you to determine what you needs to be done and what pipes should not be touched. It can be really difficult when you have to work under the bathroom flooring and walls to access the pipes. There are supporting joists under the bathroom floor that should not be cut when you are going to install new drains. These new drains should run parallel or between the joists. Prepare a design for your new plumbing layout.
  • Check if you need to secure a permit to be able to re-route the pipes. There are provisions wherein you may need to give wide clearances around all pieces of major bathroom fixtures. If there is no local building code that applies you still have to look up and follow a standard code for bathroom plumbing. You can look it up online, from your state websites.
  • Make sure that you provide access panels for the plumbing so that it will be easy to get to the pipes should something happen in the future. Pipes leading to sinks and water closets are easy to access since these are just below the sink or behind the water closet and/or toilet bowl. It is more tricky for plumbing for showers and bathtubs because these should be hidden. For most houses these can be accessed via another room or hidden behind cabinet walls.
  • Be sure that you turn off the water supply leading to the bathroom before you begin the actual re-routing of pipes. If you are going to use PVC pipes be sure to take exact measurements so that you can cut the pipes to size. Place caps and sealant on all the old pipes. If the old plumbing system used PVC pipes, there are special caps that you can buy to seal the ends of these old pipes.
  • Remove the old pipes that need to be replaced due to the rerouting and attach the new pipes according to your new layout. Be sure to use the correct type of water pipes for the hot and cold water lines.
  • Do not forget the slope requirement for drains. When you adjust the slope based on recommended based on the size of the pipes you will be able to have drains that will allow the water to flow down faster and leave your bathroom drier. Check the slope recommendations from local builders or from the shop where you buy your plumbing supplies.
  • Give the new pipes pressure and remove trapped air by capping the ends of new hot and cold water pipes and covering the drains. Turn on the water and let it flow and fill the pipes. Allow the water to be in the pipes for several hours so that you can check for leaks.
  • Turn off the water and finish the plumbing work by attaching the pipes to the outlets of the bathroom fixtures, connecting the hot and cold water supply to the right outlets. Install the fittings and check if there will be leaks around the faucets.

Do not forget to check your local building code for permits and other instructions that govern bathroom plumbing re-routing. Be sure that you will be able to tackle the job yourself before attempting the task, as there are communities and states that will require you to allow only a professional and licensed plumber to do this type of work.


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