What is the thickness of the floor slab of the common residential roof, and how to design the waterproof layer and insulation layer of the roof?

Generally, it is 12- 15CM thick, which can be waterproof before heat preservation and after heat preservation. Depending on the design or what effect you want to achieve, you can provide professional technical advice on waterproof and leakage repair of concrete for free, so as to avoid the troubles of repairing today, leaking tomorrow, repairing year after year and leaking year after year.