white wash
white wash

The whole process of white washing can be carried out under the following operations.

  1. white wash preparation
  2. surface preparation
  3. white wash

step 1 [Preparation of White Wash]

  1. White wash is prepared from freshly burnt shell lime or pure stone lime mixed with water. Shell lime is preferred over pure lime because it is whiter and mixes more thoroughly to a smooth paste.
  2. To prepare the white wash, fresh lime is carried to the work site and dissolved in a tub with a sufficient amount of water.
  3. Once molded, it is allowed to remain in a tub of water for two days and then stirred with a stick until it attains the consistency of a thin cream.
  4. Then the mixture is filtered or filtered with a clean coarse cloth.
  5. Clear glue dissolved in hot water is then added at the rate of 2 kg/m3 of lime (or 4 kg/m)3 of thin cream or white wash water) into the white wash water. The solution thus formed is called white wash,
  6. In order to prevent the glare effect caused by white washing, sometimes copper sulfate 4 kg / m. at the rate of3 Thin cream is added. To have better adhesive properties, alum or common salt can be mixed in the same proportion as the glue.

step 2 [Preparation of Surface]

  1. Before applying white wash to the new wall surface, it is essential that the surface be cleaned, brushed and freed from loose material and any other foreign matter.
  2. If the surface to be coated is extra smooth or over smooth, the coat will not stick to it. In such a case, the surface should be rubbed with sand paper to ensure proper adhesion of the white.
  3. In case of re-whitening, all loose material and scales should be removed. The old loose white wash is removed by rubbing it with sand paper. All the holes in the wall, surface irregularities, minor repairs etc. are pre-corrected by filling it with lime putty.
  4. All smooth spots should be given a coat of a mixture of rice water and sand so that the finishing wash can stick to the surface. If old white washes get spoiled due to smoke or other reasons such as in kitchens, factories, restaurants etc., in such cases, surfaces should be washed with a mixture of wood ash and water or yellow clay before applying white paint. Wash.
  5. Cement plastered walls should be washed with a weak solution of soap and dried before applying the white wash.

step 3 [Application of White Wash]

  1. The white wash is applied to the specified number of coats with a jute brush. Typically, three coats are needed for new works and scrapped surfaces, while one or two coats is considered sufficient for older work.
  2. For each coat, one stroke is given from top to bottom and another from bottom to top on the first stroke, and so on, one stroke from the right and another from the left before it dries on the first brush. Each coat should be allowed to dry before applying the next coat.
  3. The finished dry wash surface should show no signs of cracking or peeling and should not come off easily on the finger during rubbing.

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.