Efflorescence is a white or gray deposit that can form on concrete slabs as moisture evaporates. It is caused by the presence of soluble salts in the concrete, which are dissolved by water and then deposited on the surface as the water evaporates. Efflorescence is not harmful to the concrete, but it can be unsightly.

How to Locate Moisture in a House?

There are a few ways to locate moisture in a house. One is to look for signs of water damage, such as:

• Bubbling or peeling paint
• Staining or discoloration on walls or ceilings
• Musty or moldy smells
• Dampness or condensation on windows
• Rotting wood

Another way to locate moisture is to use a moisture meter, which is a device that can detect the presence of moisture in building materials.