My house was being renovated, and when I was laying the floor, I found that the cement floor outside

Can you make that clearer? Is it just this little piece of wetness? Is it wet all the time? If so, then look for a property, don't lay the floor yet.

Indicate that there is a leak between the bathroom and the outside floor. Dry the outside and continue to use water inside, if it is still wet, be sure to dispose of it. Find a developer within 5 years of the age of the house, and find a property for more than 5 years. If someone has renovated it before, they have to solve it themselves.

Is it a resurgence?

Or the stagnant water in the bathroom was left outside.

It stands to reason that it probably won't.

Where the floor tiles meet the floor, sill stones will be laid.

The specific question is about the construction workers of our family.

They're going to help.

It is that the waterproof of the door stone is not done well, and it should be done again with the leak plugging spirit and then brushed waterproof.

Generally, the waterproofing is not done well, and the leakage is generally divided into two parts, one part of the reason is that the waterproofing of the bathroom floor is not well handled, and the other is that the sanitary ware joints are infested and treated.

You can check whether the sanitary ware is leaking first, if there is no water leakage, you have to check the waterproofing of the ground, which will be more troublesome.

How many floors is in your house?

It could be that the moisture from the bathroom got inside.

The moisture-proof of the façade was not done well, and the water flowed out of the bathroom! Be careful, your floors are prone to decay.

Didn't you do the waterproof test?

The problem of waterproofing.

It could be that the waterproofing is not done well, or there is a problem with the water pipe you buried underneath.

Check it out and then do the next step, otherwise there will be problems in the future and the loss will be greater.

It's the bathroom leaking in the past.

There are many causes of leakage. Ground. walls. per interface.

Water supply pipe joints are not excluded.

Particularly problematic is the water mixer used for bathing.