PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

10.5 Plastering.
Plastering Generally:
The type and mix of mortar for plastering, the number of coats to be applied, the
surface finish of the plaster and the background to which the plaster is to be applied
shall be as indicated.
The mortar for dubbing out and rendering coat shall be of the same type and mix.
Dubbing out may be executed as a separate coat or along with the rendering coat.
Protection:
All existing work and fittings that are likely to be damaged in the application of
plastering shall be protected. Care shall be taken to avoid, as far as possible, the
splashing of mortar on to the finished surfaces such as joinery, paint work and
glazing; all such splashes shall be cleaned off immediately.
Screeds 15 x 15cm shall be laid vertically and horizontally not more than 2m apart
to serve as guides in bringing the work to an even surface.
Plastering shall be done from top to bottom and care shall be taken to avoid joints in
continuous surface.
Maintenance of proper time intervals:
To avoid break down of adhesion between successive coats, drying shrinkage of
first coat shall be allowed to be materially completed before a subsequent coat is
applied.
All corners, arises, angles, junctions shall be truly vertical or horizontal as the case
may be and shall be carefully finished. Rounding or chamfering of corners, arises
and junctions shall be carried out with proper templates to the required size.
Plastering of cornices, decorative features, etc. shall normally be completed before
the finishing coat is applied.
GTS : General Technical Specification. Page 82