Sounds to me like this would be pennywise and pound foolish. asphalt is a
mixture of tar,sand and gravel used in a thin layer as pavement to keep your
car out of the mud. If you are pouring a slab over this and building a
house on top of it the weight might very well cause the asphalt to deform
and your concrete to crack.
Seems to me you would be better off to properly grade and prepare the
substrate to support the slab to try and avoid the problems.
About the time I had mastered getting the toothpaste back in the tube, then
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