ThermoFormed Block Corp.:
Less Repair and Maintenance
"With ICF homes, the equation is simple. No Rot = Less Repair and Maintenance.
Neither polystyrene nor concrete will ever rot or rust. Concrete can even be
exposed to the elements for centuries with few ill effects. Reinforcing steel,
buried deep inside and protected by concrete's alkalinity, does not corrode."
- Source: Insulating Concrete Form Association