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 current client has specifically requested it, for financial reasons. Therefore, before I discount this option, I am wondering if there is any protocol that can be followed for successfully pouring a slab over a slab...with the confidence that the end product will perform. I have not been able to locate any information with ACI. Does a guide/protocol exist? If not, what are your thoughts/recommendations? I can provide more specific project information, if necessary. Thank you.
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