To waterproof a new RCC slab,
it is best to provide the waterproofing layer directly on the structural slab.
The insulation & finishing layers would then come on top.
SECTION THROUGH PARAPET WALL
To obtain a sound waterproofing
layer use the following procedure:
- Clean the surface of all loose particles, dust, cement laitance etc.
- In case the slab is uneven and undulated it is desirable to make it level and smooth using a thin cement mortar.
- Moisten the RCC slab (or the levelling mortar) with water.
- Apply slurry of Polyalk WP and cement in the ratio of 1:1.5 (by weight). The slurry should be freshly prepared. Uniform in consistency and suitable for brushing.
- After twenty four hours interval apply 2 more coats on the already applied coating.
- Allow it to set for 48 hours.
- Cure the coating with wet squeezed gunny bags.
- Finish the surface as per requirement.
Note: In case the root is a
sloping one, then the ‘Polyalk WP’ / cement slurry should be applied over the
top of the slab.
