The water proofing of suspended floors and roofs to structures involved the use of an overall impervious membrane to carry away surface watered seepage through the finishes to the gallery’s and outfalls
The critical nature of the water proofing on suspended or elevated slabs requires the particular attention be pointed to the following points the surface to be waterproofed must give adequate falls to drainage points either by slabs to falls or screed falls.
The waterproofing around gallery’s should be detailed to provide drainage at the both surface and membrane level particularly attention should be paid to the correct positioning and detailing expansion joints to allow them to occur at the highest point of the fall.
It’s essential that up stands be provided at joints to create a completely waterproof tray on each side with parapet flashing or traditional metal counter flashing. Particular attention should be paid to the termination of the membrane at the up stands, parapet and around opening.
