Been reading on line for several hours now. I have dampness on my garage floor, note: it's about 8yrs old. If I put a box any where on the garage floor for several hours, there will be a damp foot print of the box underneath it. If I remove the box it will dry up after several hours but the edges are still visible. At first I thought I had 'hydrostatic pressure' causing the wet garage floor but I'm not below grade and the moisture doesn't appear to be coming up the cracks (minor). Then I thought maybe the underground drains for the rain gutters were the problem (they run on two sides of the garage) but they appear to be intact & functioning property, moving the water to the drainage ditch. To be sure I'm removed the gutter down spots from the drain lines. So now I'm reading about condensation, …. not really sure about this because here in coastal Oregon the temps are pretty constant. Also there no appliances in the garage. I also read about the lack of a 'vapor barrier'. So how would you test the "condensation' theory? and 'vapor barrier'? Or does anyone have some other thoughts? any and all help appreciated. I have considered installing a room heater in the garage but would have to do a lot of electrical work. GTB
EDIT: Thanks for the replies, Garage is above grade with no standing water near me. Actually I'm a foot or more above my neighbors and at least 4 ft about the drainage ditch. I going to dig a pot hole on the east side and check the soil, then I'm going to drill a hole and see if there is water under the floor, I don't believe there is but need to know for sure before proceeding to seal the surface.