Notes On Civil Engg 1

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CHAPTER 11 -PLASTERING AND POINTING Notes 1. Rates include. - (a) Lead up to 100 m, for all materials for all Items. (b) Cost of all materials including water. (c) All lifts for all items (d) Cost of mixing cement mortar. (e) Cost of curing 2.

Rates are Inclusive of raking of joints, preparation of surfaces, erection and removal of scaffolding, finishing, curing and cleaning.

3.

Measurements:- (i) Dimensions shall be measured correct to the nearest cm. The area shall be calculated in sqm correct to two Places of decimal. (ii) Measurement of wall plastering shall be taken between walls or partitions (dimensions before plastering being taken) for length and from top of the floor or skirting to ceiling for height. Depth of cornices or cover, if any, shall be deducted. (iii)

Deductions:- For jambs, soffits, sills etc.; for openings not exceeding 0.5 sqm each In area, for ends of joists, beams, posts, girders, steps, etc., not exceeding 0.5 sqm In area; and for openings exceeding 0.5 sqm and not exceeding 3 sqm each, deductions and additions shall be made In the following manner:(a) No deduction shall be made for ends of joists, beams, posts etc.and openings not exceeding 0.5 sqm each and neither additions shall be made for reveals , jambs , soffits, sills etc. of these openings nor for finish ( finish to plaster) around ends of joists , beams, posts etc. (b)Deductions for openings exceeding 0.5 sq m but not exceeding 3 sq m each shall be made as follows and no addition shall be made for reveals, jambs, soffits, sills etc. of these openings. (1)When both faces of wall plastered/pointed with same type of plastered / pointed, deduction shall be made for one face only (2) When two faces of wall are plastered/pointed with different types or if one face Is plastered and the other pointed, deduction shall be made from the plaster or pointing on the side on which the width of reveal is less than that on the other side, but no deduction shall be made from plaster or pointing on the other side. Where widths are equal, deduction of 50 percent of area of opening on each face shall be made from areas of plastering and / or pointing as the case may be. (3) When only one face is plastered and the other face is not plastered, full deduction shall be made from plaster if width of reveal on plastered side is less than that on unplastered side, but If widths of reveal on both sides are equal or width of reveal on plastered side Is more,, on deduction shall be made nor any addition shall be made for reveals, jambs, soffits, sills etc.

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(4) When width of door frame is equal to thickness of wall or is projecting beyond thickness of wall, full deduction for opening shall be made from each plastered face of the wall. (5) Plastering and pointing In C. M. 1:3 shall be done with prior written permission of the Superintending Engineer/Chief Engineer. (6) Thickness of plaster shall be exclusive of thickness of key i.e. grooves or open joint in brick or stone work or space between lathes. The minimum thickness over any portion of the surface shall not be less than specified thickness by more than 3 mm. (7) Only 10 or 15 mm thick plaster will be allowed for all thickness of brick walls except on one side of 20 cm brick wall where 20 mm thick plaster, if actually done, will be paid. Plaster more than 15 mm thick on brick work (except on one side of 20 mm thick brick wall) and more than 20 mm thick on stone work shall be done with prior written permission of the Superintending Engineer/Chief Engineer. (8)It is essential that mixes shall be used as soon as possible after water has been added and that following working periods recommended shall not be exceeded. • (a) Cement mortar - 30 minutes • (b) Cement lime mortar - 2 hours. After completion of the finishing coat, the plaster shall be kept wet for at least seven days. Note :- (1) Where two or three coat plasters are adopted, as for as possible the mix for the under coats should contain coarse sand conforming to grading zone - II of I.S. 383 - 1970 and having fineness modulus not less than 2.0. Note :- (2) For single coat plaster the fineness modulus of sand should as for as possible 1.5 and conforming to grading zone - IV of I.S. 383-1970. Where only fine sand is available the fineness modulus of sand may be improved by mixing the required percentage of coarse sand. The strength of plaster mix gets reduced with the reduction in the fineness modulus of sand. (9)

The following lndian Standards may be referred to: -

I. S. No.

Title

383-1970

Coursed and fine aggregate from natural sources of concrete (second revision) (Reaffirmed 2007)

1661-1972

Code of practice for application of cement and cement – lime plaster finishes(first revision) (Reaffirmed 2006)

2402-1963

Code of practice for external rendered finishes(Reaffirmed 2006)

2645-2003

Integral cement water proofing compound (first revision )(with amendment No. 1)

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I. S. No.

Title

2750-1964

Steel scaffoldings (with amendments No 1 to 3) (Reaffirmed 2006)

3696(Pt. I)- Safety code for scaffolds and ladders : Part-1 Scaffolds. 1987 (Reaffirmed 2007) 8605-1977

Item No. 1101

1102

1103

1104

1105

1106

1107

Construction of masonry in dams. (Reaffirmed 1998)

Item 20 mm thick cement stone work in (a) C.M. 1:3 (b) C.M. 1:4 (c) C.M 1:6 (d) C.M. 1:8 25 mm thick cement stone work in(a) C.M. 1:3 (b) C.M. 1:4 (c) C.M. 1:6 (d) C.M. 1:8 6 mm thick cement ceiling in(a) C.M. 1:3 (b) C.M. 1:4 10 mm thick cement brickwork in(a) C.M. 1:3 (b) C.M. 1:4 (c) C.M. 1:6 (d) C. M. 1:8 15 mm thick cement brick work in(a) C.M. 1:3 (b) C.M. 1:4 (c) C.M. 1:6 (d) C. M. 1:8 20 mm thick cement brickwork in (a) C.M 1:3 (b) C.M. 1:4 (c) C.M. 1:6 (d) CM. 1:8 Labour only for(a) Item 1101

Unit

Rate

sqm sqm sqm sqm

106.00 94.00 80.00 73.00

sqm sqm sqm sqm

119.00 105.00 90.00 83.00

sqm sqm

45.00 42.00

sqm sqm sqm sqm

52.00 45.00 39.00 36.00

sqm sqm sqm sqm

68.00 59.00 46.00 44.00

sqm sqm sqm sqm

86.00 75.00 63.00 58.00

sqm

44.00

plaster on

plaster on

plaster to

plaster on

plaster on

plaster on

Remark

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Item No.

1108

1109

1110 1111

1112 1113

1114

1115 1116 1117 1118 1119 1120

Item

Unit

Rate

(b) Item 1102 (c) Item 1103 (d) Item 1104 (e) Item 1105 (f) Item 1106 15 mm thick cement plaster C:M 1:3 with water proofing compound (one packet of 1.6 kg per bag of cement). 15 mm thick rough cast cement plaster in (a) C.M. 1:3 (b) C.M. 1:4 (c) C.M. 1:6 Labour only for item 1109 20 mm thick rough cast cement plaster in(a) C.M. 1:3 (b) C.M. 1:4 (c) C.M. 1:6 Labour only for 1111 1:3 cement plaster in bands (20 mm thick) of(a) 10 to 20 cm width (b) 20 to 30 cm width 1:4 cement plaster bands (20 mm thick) of(a) 10 to 20 cm width (b) 20 to 30 cm width Labour only for items 1113 (a) & 1114 (a) Labour only for item 1113 (b) & 1114 (b). 15 mm thick cement plaster 1:3 with a floating coat of neat cement. 15 mm thick cement plaster 1:4 with a floating coat of neat cement. Labour only for item 1117 & 1118 Pebble dash plaster on walls with a mixture of washed pebbles or crushed stone graded from 6mm to 12 mm nominal size, dashed over and including fresh cement plaster 1:3 in two coats, backing coat 10mm and finishing coat 10mm thick including arises, chamfers

sqm sqm sqm sqm sqm sqm

50.00 21.00 17.00 20.00 30.00 71.00

sqm sqm sqm sqm

95.00 84.00 73.00 42.00

sqm sqm sqm sqm

108.00 96.00 84.00 52.00

m m

17.00 25.00

m m

16.00 23.00 11.00

m m

14.40

sqm

80.00

sqm

75.00

sqm sqm

25.00 143.00

Remark

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Item No.

Item

Unit

Rate

Labour only for item 1120 Pointing on brick work with cement mortar 1:3(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Pointing on brick work with cement mortar 1:4(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Pointing on brick work with cement mortar 1:6(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Pointing on stone work with cement mortar 1:3 (a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Pointing on stone work with cement mortar 1:4(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Pointing on stone work with cement mortar 1:6(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Labour only for item 1122, 1123 and 1124(a) Flush pointing (b) Ruled pointing (c) Raised and cut pointing Labour only for item 1125, 1126 and 1127(a) Flush pointing

sqm

86.00

sqm sqm sqm

40.00 42.00 59.00

sqm sqm sqm

39.00 40.00 57.00

sqm sqm sqm

37.00 38.00 54.00

sqm sqm sqm

38.00 39.00 54.00

sqm sqm sqm

37.00 37.00 53.00

sqm sqm sqm

36.00 36.00 51.00

sqm sqm sqm

25.00 26.00 41.00

sqm

24.00

etc. complete.

1121 1122

1123

1124

1125

1126

1127

1128

1129

Remark

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Item No.

1130 1131 1132

1133

Item

Unit

(b) Ruled pointing sqm (c) Raised and cut pointing sqm Cement pointing in C.M. 1:3 to flag sqm stone flooring. Labour only for item 1130 sqm Cost of water for curing only one sqm of plaster or pointing Labour only for curing one sqm of plaster or pointing

Rate 25.00 38.00 14.90 8.90 4.10

5.30

ROUGH CAST PLASTER 1134

Rough cast plaster upto 10 m height above ground level with a mixture of sand and gravel or crushed stone from 6mm to 10mm nominal size dashed over and including the fresh plaster in two layers, under layer 12mm cement plaster 1:4 (1 cement :4 coarse sand) and top layer 10 mm cement plaster 1:3 (1 cement : 3 fine sand) mixed with 10% finely grounded hydrated lime by volume of cement .Ordinary cement finish using ordinary cement.

sqm

170.00

sqm

162.00

sqm

4.00

PEBBLE DASH PLASTER 1135

1136

Pebble dash plaster upto 10m height above ground level with a mixture of wash pebble or crushed stone 6mm to 12.5mm nominal size dashed over and including fresh plaster in two layers under layer 12mm cement plaster 1:4 (1 cement :4 coarse sand) and top layer 12mm cement plaster 1:3 (1 cement : 3 fine sand) mixed with 10% finely grounded hydrated lime by volume of cement. Extra for providing and mixing water proofing material 'Impermo' of M/s Snowcem or equivalent in cement plaster work proportion recommended by the manufacturers: (a) 12 mm cement plaster 1:3 (1 cement : 3 sand)

Remark

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Item No.

1137

1138

1139

1140

1141

Item

Unit

Rate

(b) 12 mm cement plaster 1:4 (1 cement : 4 sand) (c) 15 mm cement plaster 1:3 (1 cement : 3 sand) (d) 15 mm cement plaster 1:4 (1 cement : 4 sand) (e) 20 mm cement plaster 1:3 (1 cement : 3 sand) (f) 20 mm cement plaster 1:4 (1 cement : 4 sand) Extra for plastering exterior walls of height more than 10 m from ground level for every additional height of 3m or part thereof. Extra for plastering on circular work not exceeding 6m in radius: (a) In one coat (b) In two coats Extra for plastering done on moulding cornices or architraves including neat finish to line and level: (a) In one coat (b) In two coats Extra for plastering : (a) Spherical ceiling (b) Groined ceiling (c) Flewing soffits Providing and applying plaster of Paris putty of 2 mm thickness over plastered surface to prepare the surface even and smooth complete

sqm

3.10

sqm

4.80

sqm

3.60

sqm

6.20

sqm

4.60

sqm

15.00

sqm sqm

7.10 10.90

sqm sqm

101.00 166.00

sqm sqm sqm sqm

26.00 29.00 17.00 46.00

Remark