concrete poured over asphalt ok for living area?

Slab on grade living space requires that the slab have a perimeter and any other necessary footing, as well as a vapor barrier.

snipped-for-privacy@aol.com

Greetings,

My house contains an addition which is a slab poured over asphalt. The asphalt eventually "biodegraded" and another slab had to be poured over the fist slab.

Hope this helps, William

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.