ICF homes resist moisture better than traditional builds due to closed-cell foam, warm wall surfaces, and vapor-permeable structure, but moisture issues can still occur without proper HVAC, waterproofing, and detailing. Moisture in ICF Homes: What Works, What Fails, and Why ICF homes are strong and efficient, but moisture control relies on smart design.  Despite their water-resistant structure, poor construction or HVAC choices can still lead to moisture issues. Here’s what you need to know: EPS foam resists liquid water and doesn’t support mold ICF walls stay warmer than dew point, limiting condensation Moisture sources include curing concrete, outside humidity, and wet building materials Oversized HVAC systems fail to dehumidify properly Missed waterproofing below grade is a major red flag Flashing failures and unsealed wall penetrations are common culprits Drywall and interior trim can still trap moisture if ventilation is poor ICF isn’t a shortcut to a moisture-proof home, it works when every detail is done right.  Knowing what to watch for and how to prevent issues can help you avoid costly repairs and hidden mold down the line. Why Moisture is a Silent Threat Inside Any Home In building science, “moisture” includes more than just liquid water. It covers water