Guideline for labor in cement plaster
Plastering:-
Plastering is done with cement mortar or lime surkhi mortar on the irregular or coarse textured wall, column and ceiling surface to provide a smooth, hard, level finish which can be painted for the shake of appearance.
The most common thickness of plastering on wall plane surface is 10-12mm and on rough side of 9’’ or 4.5’’ wall is 15 mm. where as more thickness is required i.e. 20 mm or more than the plaster done in two coats, one is under layer coat and top layer is finishing layer. The mix usually adopted for cement plaster is 1:3, 1:4, 1:6 and sand used for plaster should not have fineness modulus less than 1.4 to 1.5. In case where only fine sand is available, the fineness modulus is increased by adding coarse sand in the required ratio.
Laying of Plaster
- Cement plaster on ceiling/Roofing:-The smooth surface of roof/ ceiling shall be roughened by hackling or pock marking with pointed tool up to 3mm deep at 5 to 10 cm distance. All resulting dust and loose particles shall be cleaned off and washed with water. After curing the slab surface a thin coat of cement slurry is applied before starting the plaster. After applying mortar on the surface, the plaster shall be finish to a true and plumb surface and to the proper degree of smoothness as required. The work shall be tested frequently as the work proceeds with a true straight edge not less than 2.5 meter long.
Precautions to be taken at the time of plaster
- Fix all the fittings of electric pipes, water supply pipes, and electric boxes etc. properly as per drawing /requirement before starting the plaster work.
- Fit all the pipes so deep into the walls that the pipes can get proper thickness of mortar on them to avoid cracks in plaster surface.
- Make proper bond between the background and the plaster coat. Make surface of the wall clean, free from all racked mortar and dust etc. with the help of iron brushes.
- Wash and water the surface for 24 hours before the plaster is applied. Fix the reference mark (BUNDAS) on the walls truly in lines and plumb before starting the plaster. Ensure that all the edges of openings are round. Check the plaster frequently with straight edges and plumb bob.
- Do proper curing for at least 15 days to harden the plaster sufficiently and avoid the damage when watered.
- Mark proper dates on the plastered surface for proper curing .
- Protect all the fittings on the wall.
- Clean any splash of mortar on a finished surface immediately on completion of the work.
Plastering not only makes the surfaces smooth but creates a good finishing to the walls, ceiling and roofs also.
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In construction work plaster provides protection and decoration. Plaster work is important part of construction, which provides smooth, level and hard surface that can be painted to give good look. Read more about cement plaster checklist in article here.
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