The roof of the bathroom seeps water down when the weather is cold, what is the situation?

Because the metal water pipe has thermal expansion and cold contraction, when the shrinkage is in winter, the gap between the water pipe and the wall increases, which causes water seepage.

It seems that the situation you are talking about is caused by condensation in the pipes. Inform the upstairs: just keep the pipe warm and wrap it in thermal insulation cotton.

This is because when the weather is cold, the water outlets close to the ground are blocked by others, and when they are blocked, no one can flow down, and this is the reason why he is fine in the summer when the water seeps out, that is, you just need to send him something from the sewer of the sewage pipe, and don't let him see the frozen pancakes.

This is due to the cold weather, the shrinkage of the sewer pipe, and the cracks and openings at the interface where the original cement household was sealed.

At this point, you can only do a simple thing, because in this case, it may be because of the thermal expansion and contraction of the material you are using, so there will be water seeping down, or it may be that water is accumulating somewhere.

The roof of the bathroom seeps water down when the weather is cold. What is the next situation, the roof of the bathroom seeps down when the weather is cold, what is the next situation? There is a soda from the Ha gas family on it.