Cement plastering provides smooth and level surface for White wash, Distemper, Weather Shield, or Painting .
Procedure of plastering is very
simple but requires techniques to accomplish this technical job .
There are several procedural steps to
be adopted in plastering which are as under.
1- Check Alignment and verticalness
of wall and mark the difference if it is greater than 1 1/2 ".
2- Fill the dips with rough
plastering cement sand mortar (1:2) and rough the surface with wire brush so
that good bonding may be produced with plastering layer.
3- If wall contains mounted parts then
should be grinded or removed with cutters because if some portions are mounted
up to 1 " it means entire wall will require 1.5 " thick plaster in
case we are going to do 1/2" thick plaster and that will not be an
economical practice. Thicker plastering layers other than nominal thickness
causes extra loads which weakens the bonding of plaster with wall and
ultimately reduces life of plastering.
4- All grooving for electric or
water supply pipes should be completed before starting of plaster and after
fixation of conduits in the wall grooving should be filled with rich cement
sand mortars having ratios as (1:1) ,(1:2),(1:3) and after filling activity let it dry for
some days and finally cover it with chicken wire mesh .
5- Use corner beads on the mounted
corners of walls to get verticalness and straight edges.
6-Fill the joints between slab and
wall tops with filler rods and with suitable sealant materials so that plaster may be done
properly.
7-Check diagonals of every wall and make
level points using cement sand mortar (1:2) but this level points should also
be vertical and should maintain the required plastering thickness.
8-Use Liquid solution having mix
of cement ,sand, water, and 1/8"
crush and apply to make the rough surface for good bonding of plastering.
9-Mix the mortar using mixing machine
of by manual mixing with suitable cement sand ratios ,normally 1:4 mix is used
for outer plastering and (1:5) is used for internal plastering.
10-Before application of cement plaster wall surface must be showered with water to create moisture which will help morter to dry on the wall .
11-Apply cement sand mortar with trowel and spread it with float while pressing and spreading maintain the required thickness of plaster.
12-Depute Good masons and skilled
labors for plastering job ,Good mason can do 150 Sq.Ft OR 14 Sq.m in eight hours.
13- Curing of plaster should be done
for 14 days after application of plastering because cement gains 90 % strength
in 14 days.
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