WORK METHOD STATEMENT FOR
PLASTERING.
Published on December 23, 2015
1. SCOPE/PURPOSE srinivasan renganathan
Chief Operating Officer at Deep Real Estate Developers
This procedure covers the methodology to be followed for carrying out plastering and pointing work over the masonry in line with the approved technical specifications. 1. CODES / SPECIFICATION IS:1661 1. RESPONSIBILITY Responsibilities of all concerned is clearly mentioned with respect to overall administration and implementation in the approved Organogram. 1. MATERIALS TO BE USED Cement, Sand, Water, Chicken mesh, Waterproofing compound. 1. SAFETY REQUIRMENT Safety in Plastering and pointing: Use double scaffolding always and ensure the scaffolding is adequately braced with the permanent structure, for working in heights. Ensure the workers use safety appliances like safety belts in height, helmets, safety goggles while carrying out chipping etc while carrying out plastering and pointing in heights. Ensure the working area is kept clean for easy access and protect edges of opening by barricading etc while working.
Ensure the area of working is well lighted (provided with lights) so that work area is easily accessed and moved around safely by workers. Inspect the scaffolding before starting work. Access platform/working platform double hand railing to be provided. Proper illumination to be provided during the work, if required. Educate the workmen through peptalk meeting. 1. DEPLOYMENT OF EQUIPMENT As per the requirement and the direction of Project Manager. 1. DEPLOYMENT OF LABOUR As per the requirement and the direction of Project Manager. 1. IMPLEMENTATION Preparatory Works (Before Taking up Plastering): Work Preparation. Complete all internal / external works like 1. Filler walls in structural frame work
1. Fixing frames of doors, windows and ventilators 2. RCC precast jali works, 3. Fixing and concealing all kinds of pipes (getting concealed in the walls) Complete all pipelines works to their final positions and levels for Water supply lines, Sewer pipelines, Telephone conduits, Electrical conduits, TV Antenna lines & piping work for other services if any coming on wall surfaces to be completed with their hood covers fixed and finished to the final surface level of the walls / ceilings. All lightning protection like earthing to be completed. Surface Preparation: Do prepare the surface to be plastered by Clearing all dirt and loose matter Chipping and clearing of mortar dropping. Chipping and clearing of unevenness in the masonry, concrete works in ceiling and walls of rooms. Chipping and clearing the debris in areas of skirting and dado after marking the cutoff levels clearly.
Raking out joints if necessary for proper keying For concrete surfaces: Prepare the surface of concrete members by Hacking at close intervals (50 to 70 mm center to center) with bush hammer or with a chisel and hammer and then wash it thoroughly with water. This will roughen up the concrete surfaces and ensure a good bond is provided for the plaster. When concrete surfaces are greasy or oily, washing with acid may be done after the wall is wetted with water (using a solution of one part muriatic acid diluted in 1020 parts of water). After this acid cleaning, wash the surface thoroughly with water to remove all the traces of acid. Note: This second washing is to remove all acid traces, so that the alkalinity does not react with acid causing improper setting of cement and other problems. Fresh concrete surfaces are to be roughened with a heavy wire brush or a special scouring tool. Note: Form work for concrete meant to receive plaster, should preferably not be given any oil coating, as these are likely to remain on the concrete, interfering with bonding of the plaster. Care must be taken to remove the oil coating, before plaster is applied. For Brick / Block Masonry Surfaces:
The surface should be hard, rough and clean. The joints should be raked 10mm deep and splashed with water. It may be desirable to rough the surface with pick or a similar tool, if the surface of stone in stone masonry is smooth, splash with water, allow to dry before Plastering is taken up. Fix in position button marks at a spacing not more than one length of the straight edge (viz 1.2m or 1.5m as the case may be for the entire surface to be plastered). Check thoroughly all button marks for the thickness whether it is as per specification. In case the thickness is more, do carry out the making up coat well in advance and scratch the surface rough to receive plaster. Similarly when thickness is less, do carry out chipping where required, so that minimum thickness of plaster is available at all places. Fix in position all plastering accessories like 1. Chicken wire mesh in joints. 1. Edge guards, edge stoppers, corner angles, corner beads etc, 2. Panel dividers, pattern marking on the wall / ceiling surfaces. Fix erect scaffolding system in advance so that it can be used for survey work, surface preparation, carrying out plastering, curing. Light the area well in advance.
work method for plastering Mortar Preparation If mortar is to be prepared manually, the mortar for plastering has to be prepared on a firm, neatly finished platform surface or on metal sheets only. A small capacity mechanical mortar mixer can also be used. The sand /aggregate has to be sieved for proper gradation. The sand aggregate has to be washed to remove impurities like mud, if required, and sufficiently dried before plastering work is taken up. In case wet sand is to be used, check for quantity of water in mortar and allow for bulkage of sand while mixing to get consistency of mortar. For stucco plastering, aggregate to be thoroughly washed sieved, hand picked to remove unwanted coloured aggregates, flaky particles, which when used will spoil the quality of plaster. Prepare the mortar in clear area in proportion as specified. Mix mortar in a number of batches, a batch being the quantity (or volume of mortar), which can be consumed with in next 2 hours. Add water to the dry mix of sand and binder (not other wise). If specified in the contract, do add the admixture to the mixed mortar and mix again thoroughly.
Mix proportion required is 1:4. Plastering: The work procedure shall be: Wet the surface to receive plaster one hour before, so that while starting plastering, the surface is skin dry. Ceiling plaster shall be completed before commencement of wall plaster. Plastering shall be started from the top and worked downwards to the floor Throw the mortar for an area coverable by the straight edge, both vertically and horizontally in one stretch. Level the surface using the straight edge. Float the surface and finish as per specification. Repeat this operation for the entire area in stages. While proceeding with the work, do float and finish the joints in I stage and then in subsequent stages properly. This is to ensure the stages, in plastering work, is not apparently visible.
Intermittently do check the surface for plumb, line and level and make up all deficiencies. − Provide 12 mm thick single coat plaster in internal surfaces of concrete and masonry wall in CM as specified & 10 mm thick single coat plaster on ceiling with CM as specified. Provide 20mm thick double coat plaster for external surface of wall as described below – 1. First coat 12 mm thick in CM of specified mix. Curing to be done for 7 days. 1. After completion of first coat curing, provide second coat 8 mm thick of specified thick. Curing to be done for 7 days. Trueness of plastered surface when checked with the straight edge of 2 mts length shall not be greater than 4mm at any place. Do and Don’ts in plastering works: Dos: Check thoroughly before and immediately after plastering, the line and levels. Check thoroughly before and immediately after plastering, the surface areas for unevenness, surface blemishes etc so that all rectification (if required) can be carried
out with in the final setting time, with out much additional costs. Clean the floor area where plastering is to be taken up, to ensure plastering remains to quality (without dust settling on wet surface). Cure the plastering well for required number of days. Restrict the access to area where plastering is complete (This will ensure better protection of edges, corners, angles etc). Finish the plaster touch up works near the skirting, after skirting and dado works are completed. Also Do ensure a neat work is done. Ensure all touch ups are done neatly after precast slabs are embedded in position, working platforms are inserted in position, and sanitary fixtures are fitted (merging the surfaces being touched up with original surfaces). While stopping the work for the day, do ensure the surface end line is cut inclined at 45 degrees or 60 degrees. When starting the work next day, join the new plastering and old plastering with neat workmanship (so that the joint is not showing up badly). Stop the work preferably in corners, jambs, stoppers or at grooves etc. This will avoid cracks at joints. Do ensure these joints are finished neatly. Round the edges than to keep sharp 90 degree edges (pencil round namely a small curvature of less than 5mm radius). Similarly at the junction of ceiling to wall, Do round off the junction.
Don’ts: Do not allow mortar mixing on unclean area, with out a platform and in large quantities. Do not allow usage of partially set mortar. Do not allow of free sprinkling of dry cement in the mortar or on the surface being plastered, as this may cause uneven shrinkage and lead to development of shrinkage cracks. Do not mix different bands of cement in same room / same area as this will show colour difference (till plastered surface are covered with some other finish). Do not allow any breaking or chipping open the plastered areas, for laying pipes etc once plastering is completed
Tagged in: plastering
srinivasan renganathan
Chief Operating Officer at Deep Real Estate Developers
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