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The existing concrete slab is in great condition. The reason for slab on slab is simply to raise the elevation of the existing slab area to connect spaces that are at varying elevations (4" difference) for accessibility purposes. The floor area to be raised 4" is approximately 380 s.f. (19ft x...

It is an interior slab on grade. Again, we know nothing about the material under the existing slab.

I am looking for standards/specifications/recommendations/design guide for pouring a 4" concrete slab over an existing interior 4" concrete slab (foot traffic)...if one exists. Typically, we do not recommend or specify this, due to lack of knowledge of the existing slab and sub-base, however, a...