I have 2 questions.

1. I know there are building codes on waterproofing/dampproofing slabs, but what are the specs that the proofing should adhere to (like X amount of moisture is permissible or something else to say the proofing is satisfactory). If so where can I find it?

2. If moisture seeps through the slab and cause engineering hardwood floor to saturate (30%+), can we assume the waterproofing/damp proofing has failed? Assume no other places where water would have entered the floor. Yes I understand it's unlikely but still have to ask.