about a year ago I had my crawlspace conditioned. Among other things, the company put in a concrete slab for the floor and added a sump pump in the corner.
The strange thing is, there is a 1-4 inch gap on the surrounding slab (see attached picture).
NOTE: Where the crawlspace connects to the basement the gap is not there i.e: where there is "no wall"
Does anyone know why this is? I am assuming this is related to the drain for the sump pump?
Another concern is my radon levels in the basement are extremely high and I am wondering if this big gap is contributing to the spiked levels.
Thanks in advance