method statement - plastering, dated. jan. 03. 2007

8/22/2019 Method Statement - Plastering, Dated. Jan. 03. 2007

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METHOD STATEMENT

PLASTERING

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1. INTRODUCTION :

This method statement includes and covers the working methodology forCement Sand Plastering woks in the buildings T1 & T2 at Packages 1D & 1E.

Following works are covered under this method statement:

Internal Cement Portland Plaster

External Cement Portland Plaster

Formed in Place Plaster grooves in elevation.

External Formed in Place decorative cornices in building elevation.

This working methodology explains the general method statement of worksequences in accordance to the relevant project specification irrespectiveto the approval of materials. Material submittals and approvals shall beprocessed simultaneously at the same time but separately.

2. APPLICABLE MATERIALS :

This method of statement includes unit masonry and assemblies consistingof the following:

Portland Cement ASTM - C150, type 1.

Sand Aggregate ASTM C 897 White Sand for base coat, redsand for dash coat.

Plastering Accessories: Metal Lath, angle beads, special

pieces for internal angles and corner. Fiber (CMCI)

Trial Mix concrete

Note: Kindly note that material submittals and Mortar Mix Designsubmittals are currently under process and shall be submitted toDAH for approval shortly in due course of time as a separate subject.So this method statement should be reviewed in the sameperspective for the approval of working sequences and methodology

without linking to the material approvals.


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3. EQUIPMENT & TOOLS

Following Equipment and tools shall be generally used in the workingof Block Masonry activity:

a) Mechanical mixer machine for mortar job mix.

b) Tools; wire level, plumb bob, chisel, concrete swivel, aluminumbar, wooden trowels, steel trowels, steel angle 90o/45o/135o,rubber hammer, brush, bucket, one wheel trolley.

4. PREPARATORY WORKS

Clean the surface and remove any dust, contaminatedmaterials on plaster bases and substrates for direct

application of plaster, removing loose material andsubstances that may impair the work. Form ties and otherobstruction shall be removed or trimmed back even withthe surface of the solid base.

Dissimilar Backgrounds: where rendering is to becontinued without break across joints between dissimilarsolid backgrounds which are in the same plane, cover

joints with 200mm wide galvanized steel lathing as

specified & approved fixed with corrosion resistantfasteners at not more than 600mm centers along bothedges, apply mesh over electro-mechanical embeddedconduits.

Apply forcefully dash coat on concrete and concretemasonry surfaces indicated for direct plaster application.Dash coat is to cover full surface to be plastered and is toprovide rough surface of sharp protrusions ranging 3.0mm

and 5.0mm. Dash-Coat Mix: 2 volume parts Portlandcement to 3 volume parts fine sand, 1 part bonding agentto 3 part clean water mixed to a mushy-paste consistency


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shall be left untroweled, undisturbed and moist cured for atleast 24 hours after application and before plastering.

Install temporary grounds and screeds to ensure accuraterodding of plaster to true surfaces. Check the straightness

in each corner and add grout to hold the external cornerbeads incorrect and internal position to be fixed using corrosionresistant fasteners.Before plastering starts, dampen, by spraying waterconcrete dash coat surfaces that are to receive plasterwith clean water.

5. PROCEDURE ( Plastering Application ):

A. All plaster shall be prepared in a mechanical mixer mix 1:5 (1part cement and 5 part sand) using sufficient water toproduce a workable consistency. Mix fiber 0.6 kg/m3 of themortar or plaster by first mixing with some water (30%). Afterall the ingredients have been added including the remainingmixing water, the plaster should be mixed for a further few

minutes until uniform fibre dispersion. Plaster not used within1.5h from start of mixing shall be discarded.

B. The second coat shall be applied with sufficient material andpressure to ensure tight contact with dash coat.

C. The surface of the second coat shall be brought to a true,even plane with a rod or straightedge, filling surface defectsin place with plaster.

D. Applied plaster shall be floated as smooth as possible andthen steel-troweled. Steel troweling shall be delayed as long


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as possible and used only to eliminate the uneven points andto force aggregate particles into the plaster surface.

E. Each plaster coat shall be applied to an entire wall or ceilingpanel without interruption to avoid cold joints and abrupt

changes in the uniform appearance of succeeding coats. Wetplaster shall abut set

plaster at naturally occurring interruptions in the plane of theplaster, such as corner angles, openings and control jointswhere this is possible.

F. Make internal angles and corners square.

G. Finished grooves shall be neat, of uniform width and depth,sharp straight edges and exact vertical and horizontal lines.Elevation grooves shall be cut before plaster sets by usingmolded guide or wooden strip and fixing it in temporary groutand screed. Regarding recessed, follow the procedures sameas grooves.

H. Form cornices by plastering additional coats against pre-formed wood templates fixed onto plastered elevation. Makeform wood templates to shapes, dimensions and projection

indicated on drawings. Apply additional under coats inthickness not more that 10mm until obtaining requiredprojection. Final finishes refer to item D.

I. Plaster should not deviate more than plus or minus 3mm in3m from a true plane in finished plaster surfaces, asmeasured by a 3-m straight edge placed in any location onsurface.


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6. CURING.

Curing of Plastered Walls shall be continued for 3 days bysprinkling of water twice a day.

7. CUTTING & PATCHING.

Cut, patch, replace, repair and point up plaster asnecessary to accommodate other work. Repair cracksand indented surfaces. Repair work to eliminateblisters, buckles, check cracking, and dry out as

necessary to comply with visual effects.

To correct inaccuracies, dubbed out in thickness of notmore than 10mm in same mix as base coat and totalthickness of dubbing must not exceed 25mm unlessotherwise approved.In areas where thickness is more than 20mm, applydash keying mix before adding new layer.

To correct inaccuracies in beam, column together withblock work, chip carefully the concrete structures byusing hammer and chisel to receive dash coat (followthe procedure in 1.C). For 25mm thick plaster repairapply it one time as per 2.B. For 45mm thick, apply20mm first coat and apply keying mix before addingthe new layer. Each layer must not exceed 10 mm, startagain same as from 1C.

method statement - plastering, dated. jan. 03. 2007

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