| Sat Feb 18, 2017 | Post #1 | S L Gupta (Civil Engg)
Join date: Mar 2008 | Dear Das,
- Plan the plastering when the surface receiving plaster coat is sufficiently matured.
- Ensure that subsequent building operations do not cause any damage in plaster work.
- Start external plastering from the top most floors and proceed downwards.
- Start internal plastering after the structural work is complete.
- Do plastering on ceiling wherever required before the walls are plastered.
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 mortar used cement sand mortar or cement, lime and sand mortar
used for finishing of wall, ceiling surface. The mortar is spread on
the irregular surface of wall or ceiling and finish with the tool
required for it.
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.
- On walls:-In addition to general roughness in the
masonry, the joints shall be racked out to a depth of 10 mm for
providing key to the plaster. Dust and loose mortar shall be brushed
out. Efflorescence, if any, shall be removed by brushing and scraping.
The surface shall be than thoroughly washed with water, cleaned and kept
wet before plaster is commenced. To ensure true thickness and a true
surface, plaster gauges 15x15 cm shall be applied horizontally and
vertically at 2 meter interval and truly plane to plaster surface. After
that plaster mortar shall be applied on the surface and after words 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. All horizontal lines and surface to be checked with level and all
jambs and corners with a plumb bob as the work proceed.
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.
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| Tue Sep 01, 2020 | Post #2 | NormaG
Join date: Sep 2020 |
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| Thu Sep 03, 2020 | Post #3 | leelindsey
Join date: Mar 2020 | Plasterwork is construction or ornamentation done with plaster, such as a layer of plaster on an interior or exterior wall structure, or plaster decorative moldings on ceilings or walls. This is also sometimes called pargeting. | | |
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Cement Plastering -Construction Questions (38) | |
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