I'm in the process of tearing out carpet and installing laminate in my guest bedroom. After I got the carpet out, I discovered a hole several inches across underneath the wall that borders the garage. The other wall, which is a foot or so away, is an exterior wall. In the center of the hole is a copper pipe (~1/2" diameter) with pipe insulation around it.
I THINK it runs outside to my A/C unit, but I'm not sure why it's running into the slab, since the line for the A/C exits a few inches up the brick. The evaporator is in the attic.
Can I just fill in the void with concrete patch? Do I need to wrap the pipe with anything first?