What are the white crystals that fall off the roof of the bathroom?

That's nitrate, that's because the wall is damp will cause the alkali return phenomenon, the bathroom is the place with the most moisture, but also the most susceptible to moisture.

These white crystals are also known as "alkali return", "salt frost" or "nitrate", and the biggest reason for this is leakage.

This is the white crystals caused by the anti-alkali. This may be caused by water leakage, and it is necessary to check the water leakage in time to avoid greater losses.

White crystals fall off the top surface of the bathroom, which is a problem with cement frosting.

The top of the bathroom is decorated with putty. Since the toilet is affected by moisture and humidity for a long time, water vapor from the putty.

The layer penetrates into the wall, and in the long run, there will be a phenomenon of alkali return, which is what we see as white crystals! Because there is a water leak in the upstairs bathroom, the decoration on the downstairs bathroom has been destroyed. Because long-term leakage is not resolved, the leakage problem will spill the alkaline material in the concrete floor and condense into white crystals on the decorative layer on the top of the bathroom.

The most common of these phenomena is the connection of various pipes on the top of the restroom and on the floor.

The top surface of the toilet can be caulked after the mortar is consolidated, and it generally takes more than 24 hours, otherwise it is easy to return to alkali. In the process of tile pasting caulking, the capping was not closed in time. Cause rainwater and other moisture to infiltrate, easy to cause alkali return.

In the later stage, after drilling air conditioning holes, installing rainwater pipes, pendants and other construction processes, the connection parts are not waterproof sealed. The bathroom is the place where we use the most water in our home, that is, the place where the moisture in our home is the heaviest. The decoration of the top surface will inevitably have some quality problems in a long-term humid environment, the most common is pulverization, peeling, falling off, and alkali return, and the alkali return phenomenon we see is the "white crystal" shaped object that this friend saw!

In fact, this is alkali return, that is, cement sand. The main reason is calcium hydroxide in cement products.

with atmospheric carbon dioxide.

reaction, calcium carbonate.

deposited on the surface of concrete products. or calcium hydroxide, the hydration product, which, when the water evaporates, crystallizes in the cracks of the concrete and collects on its surface. In addition, limestone or construction sand contains a certain amount of soluble alkali-containing organic matter, which forms calcium hydroxide and carbonate.

or other alkali salt solutions are easy to quickly seep out "frost salts" on the surface of the concrete, and frost. The above is the answer to the question of what is going on with the white crystals falling off the top of the bathroom.

The first reason: since you can see that there is an abnormality on the top surface of the bathroom, it proves that the bathroom does not have a ceiling (it is more common in the bathroom of our self-built house), and the top surface of the bathroom that has not been decorated with ceiling decoration is generally decorated by scraping putty and painting. The second reason:

Take our self-built house as an example, the bathroom of the whole house is basically in the same location (it seems that the commercial house is the same), when there is leakage on the floor of the upstairs bathroom, you can see the traces of leakage from the top decorative layer of the downstairs bathroom.

It may be caused by the cause of anti-moisture, and there are some places where the salinization of buildings is more serious.

It's very likely that your upstairs bathroom is leaking, causing the bathroom roof to be damp.

If it is gypsum dust or calcium salt crystals, it can be cleaned with a damp cloth or vacuum cleaner. If the stone is falling off, the damaged part of the stone may need to be repaired or replaced.

If white crystals are falling from the top of the bathroom, there could be several possible explanations:

Gypsum dust: During the renovation process, if gypsum board or gypsum products are used for the construction of the ceiling, sometimes gypsum dust will fall from the ceiling, forming a crystalline substance of white boys.

Calcium salt crystals: If the water quality in the bathroom contains high calcium ions, after a long period of use, the water will evaporate and leave a calcium salt residue, forming white crystals. Base car.

Chalk: If a stone material, such as marble or chalk, is used on the top of the bathroom, tiny particles on the surface of the stone sometimes fall off, forming white crystals.