Very good question VeeJay, Its always good to do initial investigation / inspection if the leaking condition is too complicated and to determine which area toilet leaking. We call this ponding test

And for your case, the problem should be Waterproofing issue if the leaking occasionally drip. Usually if the water dripping day and night with constant dripping speed, most likely its due to piping.
There are many brands of cementitious type waterproofing in the market. And most of them does work well as long you follow the manufacturer guides instruction. And contractor must have some basic knowledge how to apply. I will soon come out with some technical drawing details waterproofing.

Popular Brands Waterproofing in Malaysia Market for tendering contract project
1. Sika, Mapei, Penten, Estop, Fosroc, Xypex, Greenseal, Greencemt, Bostik, Daco, Axel Chemil, STO, Oriental Yu Hong (upcoming china brand)

Some of the brands above you can't find in any hardware store and can only get at their manufacturer plant. You can get very good discount with bulk quantity. Some of them only focus supply to big development project contract only.

The new waterproofing brand Oriental Yu Hong is the cheapest and have bigger coverage. A close friend of mine is dealing directly with the manufacturer. The sample quality is unbelievably good.

Example of technical drawing details submit for architect or consultant for approval

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