I have an ICF home with steel infrastructure and I have been in it for 3 years. Unbelievably great home, great construction, will never again own a wooden framed home (if I can help it). But I have two rooms in the basement (partially underground), and when you are down there and it is quiet, you can hear a "thumping" sound coming from the walls. Sounds like the popping that a new car makes when you turn it off and the engine/exhaust is cooling off, but this is a very deep bass sound. Not really loud, but it is noticeable. Does anyone know where this sound is coming from? It occurrs at regular intervals, and I notice it more when it is getting really cold at night. Could it be the concrete/rebar responding to cold/heat stress? I really just want to know what it is. I'm sure it's normal, but I wanted to know if anyone else experienced this.

How about rodents living in a concrete void?? Just kidding!!!!

Perhaps you could supply even more info? These two rooms are partially above grade? It is only these walls making some sort of noise? Are the walls idential in their exposure and subsequent noises? Did this happen from the move in? Any other conditions you may have noticed, such as after a rain storm, or other times besides getting cold at nite? Where is this home located?

There are many here who will try to help, so add details please.