“What type of concrete is recommended for repairing a patch around a leaking toilet flange in a basement bathroom with low ground depth?”
Asked by درسا رضاییان 
7 months ago
Last Updated: May 13, 2024
Hey, quick question – what kind of concrete should I use to fill this spot? The photo shows where it’s deepest.
I’m in the process of swapping out the laminate flooring in the basement bathroom for LVP. There was a leak from the toilet that made the patch around the flange all brittle. I got rid of as much loose stuff as I could and vacuumed it out.
You should have a plumber change the toilet flange before proceeding.
Are you planning to reinstall a toilet? The flange should be level with or slightly above the floor when finished.
Looks like that flange is beyond repair
Definitely replace the flange and then use hydraulic cement for patching
How can you know if the flange is worn out just by looking at the picture?
It may look messy with old wax stains, but only a closer inspection can reveal if it’s corroded and beyond repair.
An extension is necessary to bring it up to floor level before applying the cement patch.
Yeah, I agree. If the flange isn’t working, you can swap it out with a split flange made for those types of fixes.
William noticed it appears to have some rust. If there’s a bit of rust, there’s probably more 
There’s some paint missing and it seems to be rusting 
‘t worry about the piece that’s missing here 
You should consider getting a new flange first
The issue with these kinds of fixes is that the cement/sand mixture used to fill the gaps left by the damaged concrete will take more than a week to become strong enough. Rushing to secure the flange prematurely could cause Tapcon screws or expanders to damage the still-soft concrete. It might be wiser to use an epoxy designed specifically for anchoring in concrete if time is of the essence.
Actually, he can either wait or go to the gas station to use the restroom.
Make sure to clean it thoroughly and opt for hydraulic cement, but keep in mind that you need to act quickly!
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The best thing to do is grab a bag of concrete and patch it up. Any type of concrete will work, just be careful because there is quick-setting concrete that hardens quickly. All you need is a bucket, something to mix the concrete with, water, and if you get a 50 lb bag, you can fill it up with a couple of scoops. If you’ve never mixed concrete before, be cautious not to add too much water or too much powder. You just need to find the right balance for mixing.