Process of Work
(Stepwise) for application of Hyperplast polymeric waterproofing membrane:
1. The Bathroom, passage sunks, balconies & open
sundecks, etc. where Hyperplas polymeric waterproofing membrane is to be
applied has to be thoroughly cleaned with wire brush to eliminate all sharp
projections, oil, grease, etc.
2. The cleaned surface must then be grouted with
cement slurry, and a smooth base coat of cement: sand mortar mix 1:5 must be
applied over the grouted surface, with proper leveling and smoothening. The
surface should be cured for 7 days.
3. Water based bitumen primer should be applied with
brush over the dry smooth base coat. Hyperplas polymeric waterproofing membrane
sheets should then be unrolled over the coated surface with overlaps of 10cms.and
upto a height of 80cms. along the vertical surface and bonded thoroughly to the
coated surface by application of hot blown Bitumen of 85/25 grade with a gas
operated torch and the overlaps must then be thermofused by torch application
to ensure that joints are leak proof. Care should be taken so that there is no
overheating of membrane to prevent complete loss of homogeneity. Also Hyperplas
sheets should be checked for cracks, tears, holes or other manufacturing
defects before use.
4. Screed coat of cement: sand mortar mix 1:5 should
then be applied over Hyperplas sheets with fixing of chicken mesh using buttons
of Hyperplas for all vertical surfaces. The surface should be cured
for 3 days.
Process of Work
(Stepwise) for Bathroom/Passage sunk filling:
1. The sunken surface should be cleaned thoroughly.
2. Provision of a 32mm PVC pipe for water escape
outlet should be made just above the screed coat at the center of the sunken
surface towards the sloping end.
3. All plumbing holes and openings should be sealed
water tight.
4. The sunken portion should then be filled with
cement : sand mortar mix 1:5 with rubble stone packing of size 10cms.and water
proofing compound Nafufill and all gaps and interstices should be thoroughly
filled. The sunk should then be filled with water and cured for 3 days.
5. A smoothening coat of cement: sand mortar mix 1:5
should then be applied over the filled sunk with the required slope. The smooth
surface should then be cured and the sunk should be filled with water for
testing for min. 7 days.
