Firstly protect all the equipment of air-conditioning, water heater solar, and pipes across the slab .
Remove the existing damaged water proofing if exists
Thoroughly clean the slab surface with grinder ,blower to remove all loose particles etc.
Find out and observe the cracks on the slab, and fill with crack filler thoroughly and keep it dry for some time.
Make the slope to drain out let area with screed mortar to make good slope towards drain outlets.
All edges and corners make 45 degree chamfer all around boundary wall and any foundations.
Now it is ready for water proofing memebarane.
Apply first coat keep it for dry and apply second coat with fibre net and kept it dray for one day.
Then apply final coat thoroughly and good manner.
Make it for water test for 48 hours.
If you found any leak make it throughly again all edges .
Clear the site and keep it clean
Andover to client
Hope my method you may like it. If any comments please send me your message
Thank you
Regards
0504578951
Viswa Homes , Dubai 