Moisture intrusion is when water enters a building or a home, and is one of the most significant factors affecting the durability of a building.
Building moisture can cause mold, fungal growth and other microbial contamination, as well as corrosion, decay, rot and other moisture related deterioration. These issues can pose serious health risks for occupants, and will likely lead to costly repairs to correct the problems that first allowed moisture to invade the envelope.
Moisture problems are usually due to incorrect building practices for example builders that leave out the damp course when building, or causes like incorrect roofing practice. However, these problems can also start occurring when buildings are neglected and not maintained for long periods of time.
Buying a house with moisture problems can quickly become a big hassle when the rain season arrives. Make sure you inspect before you buy.