White washing and shading washing of the surfaces of buildings is vital on both sterile and stylish reasons. To acquire a spotless, perfect and uniform completion, it is important to embrace appropriate strategy for both readiness of surface to get white wash or shading wash and for utilization of white wash or shading wash.
White wash is set up from fat lime. The lime is slaked at the site and blended and mixed with around five liters of water for 1 kg of unslaked lime to make a slim cream. This ought to be permitted to represent a time of 24 hours, and afterward ought to be screened through a clean coarse material.
One kg of gum diluted in water may likewise be added for each 10 kg of lime. Now and then, rice is utilized in the spot of gum. The use of sodium chloride (regular salt) to lime-wash helps in snappy carbonation of calcium hydroxide making the covering hard and rub-safe. Little amount of super marine blue (up to 3 gm for each kg of lime) might be added to the last two layers of white wash arrangement.
The new surface ought to be completely wiped off all soil, dust mortar drops and other unfamiliar issues before white wash is to be applied. Old surfaces effectively white-washed or shading washed ought to be broomed to eliminate all residue and soil. All free sizes of lime wash and other unfamiliar issues ought to be eliminated.
Where hefty scaling has occurred, the whole surface ought to be scratched perfect, any development of molds greenery ought to be eliminated by rejecting with steel scrubber and ammoniacal copper arrangement comprising of 15 gm of copper carbonate disintegrated in 60 ml of alcohol smelling salts in 500 ml of water, ought to be applied to the surface and permitted to dry altogether prior to applying white or shading wash.
White wash is applied with moonj or other brush, to the predefined number of coats (by and large three). The activity in each coat should comprise a stroke of the brush given from top down-wards, another from the base upwards over the first before it dries. Each coat ought to be permitted to dry before the following coat is applied. The white washing on the ceiling ought to be down preceding that on walls.
Working out the quantities of lime and glue of three coats for a plastered wall with length 15 m and height 5 m.
To determine the entire area for white washing, multiply both length and height of the wall as follows,
White washing area
= 15 m x 5 m
= 75 m2
We know, 3.5 kg per 10m2 (surface area) of white fat line is necessary for a triple coat white washing, and 0.12 kg glue is needed. Now we proceed to calculating the whitewash quantity as follows:
The quantity of white unslaked lime
= 3.5 kg/10m2 x 75 m2
= 26.25 kg
The quantity of glue
= 0.12 kg/ 10m2 x 75 m2
= 0.9 kg or 1 kg (approx)
"The coverage depends on surface smoothness, water quantity added during mixing and application. The standard coverage of wall putty in 2 coats is 14 -16 sq ft/kg. So calculation of estimation of wall putty count area of wall and divide it to 14/15/16. Suppose the wall area L is 10ft & H is 15 ft. Then your area is 150 sq ft divided by 15, the answer is 10 kg putty required for the wall."
"As per manufacturer, 1 kg of wall putty will give 18 - 20 sq.ft coverage, in 2 coats, under standard conditions. But in reality, the coverage depends on surface smoothness, mix of the putty and application and above quoted coverage is far from reality."
"Take it as about 400 sft of wall coverage with a bag of 40 Kg for first time plastered walls. 2 coats making about 1 mm thick coating."