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I was downstairs and noticed that there's a gap between the concrete pad and the bottom of the exterior walls on the south side of my house. In some cases it's maybe 2 quarters wide, and along the wall in the nook it's actually almost a full half inch.

Is this normal? I'm not familiar with how the outside walls are constructed as the bottom plates of these walls seem to be sitting on some kind of chip board plate.

Here's some pictures. Yes that's coloured sand everywhere; my son has a sandbox downstairs since our yard isn't finished I put a broom handle in the image to give an idea of size. Click each image to get a larger version.