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Bathroom Renovation Plumbing Mistakes

5 Common Problems

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by Jeff Patterson in Bathroom Plumbing
Bathroom Renovation Plumbing Mistakes

Bathroom renovation plumbing mistakes can be bad.

In fact, the plumbing mistakes we’ll discuss could cost thousands to fix.

How can you avoid these common pitfalls?

You’ll find out.

Mistake #1: Not Inspecting Old Pipes 

All bathroom pipes should be inspected. Look at the waste pipes, toilet flange, water supply lines, vent pipes, etc.

And always replace brass and galvanized pipes because they corrode or leak over time. PVC and ABS are way better than old pipes because they’d don’t corrode.

Cast iron stacks and waste pipes should be carefully inspected for cracks or old repairs. Don’t assume cast iron will last forever. Because it won’t.


Mistake #2: Old Valves and Water Lines

This one always gets homeowners. They want to save money by keeping the old shower rough-in valve. We totally understand why, but old rough-in valves leak. And you don’t want to be on the receiving end.

Same principle for water supply lines. Replace copper or brass lines that show signs of corrosion. There’s nothing worse than surprise water leaks.


Mistake #3: Shower Vents

Shower venting is super important. It helps the shower or tub properly drain. Improperly vented showers won’t drain fast and can be very frustrating for homeowners.

In addition, some older homes don’t have venting. This needs to be fixed. Otherwise showers or bathtubs will drain slowly and nobody likes that.


Mistake #4: Horizontal 90 Degree Fittings

There’s nothing more aggravating than clogged pipes. When this happens the plumber or homeowner will need to snake the line.

But a common mistake is having 90 degree horizontal fittings. These are incredibly difficult to snake and should instead be two 45 degree fittings.


Mistake #5: Improper Double Vanity Venting

This problem is very hard to fix after bathrooms are renovated. We don’t want you to make this mistake.

Watch our video to see the correct way to convert a single vanity to a double vanity and how to vent it the right way.


What’s Next

Are you attempting a DIY bathroom remodel?

Check out Bathroom Repair Tutor where we have detailed tutorials and support inside our private Facebook Group.

We cut to the chase super fast and enjoy helping members build amazing bathrooms.

Enroll Today



Jeff Patterson





1 Comment
  1. David Myers says:

    Hello, I would like to get your opinion on how to add my washer drain to my cast iron main line . i only have access above a concrete floor. If i draw a good picture of what i have could you help ?

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