Water proofing cement paint
Finishing wall with water proofing cement paint of on wall surfaces (Two coats) to give an approved brand and manufacture and of required shape even shade after thoroughly brushing the surface to remove all dirt and remains of loose powdered materials.
1.0. Materials
1.1. The water shall conform to M-1. Cement water proofing paint shall conform to I.S. 5410-1969.
2.0. Workmanship
2.1. Scaffolding: Wherever scaffolding is necessary it shall be erected in such a way that as far as possible on part of scaffolding shall rest against the surface to be white or colour washed A properly secured strong and well tied suspended platform (Zoola) may be used for white washing. Where ladders are used pieces of old gunny bags shall be tied at top and bottom to prevent scratches to the floors and walls. For white washing of ceilings, proper stage scaffolding shall be erected where necessary.
2.2. Preparation of surface :
2.2.1. The surface shall be thoroughly cleaned of all dust, dirt, mortar cropping and other foreign matter before water proofing cement paint is to be applied.
2.2.2. The surface spoiled by smoke soot shall be scrapped with steel wire brushes or steel scrapers shall be rubbed with over-burnt surkhi or brick bats. The surface shall be then broomed to remove all dust dirt and shall be washed with clean water.
2.2.3. Oil or grease spots shall be removed by suitable chemical and smooth surface shall be rubber with wire Crushes.
2.2.4. All unsound portion of the surface plaster shall be removed to full depth of plaster in rectangular patches and plastered again after raking the masonry joints properly. Such portion shall he wetted and allowed to dry. They shall then be given one coat of water proofing cement paint.
2.2.5. All unnecessary nails shall be removed the holes, cracks, patches etc. shall be made good with material similar in composition to the surface to be prepared.
The surface shall be thoroughly wetted with clean water before cement water proofing paint is applied.
2.3. Preparation of paint: Portland cement paint shall be prepared by adding paint powder to water and stirring to obtain a thick paste, which shall then be diluted to a brush able consistency. Generally, equal volumes of paint powder and water make a satisfactory paint. In all cases the manufacture's instructions shall Site followed. The paint shall be mixed in such quantities as can used up within an hour of mixing as otherwise the mixture will set and thickness, affecting flowing and finish. The lids of cement paint drums shall be kept tightly when not in use.
2.4. Application of Paint:
2.4.1. No painting shall be done when the paint is likely to be exposed to a temperature of below 70 c within 48 hours after application.
2.4.2. When weather conditions are such as to cause be carried out in the shadow as far as possible. This helps the proper hardening of the paint film by keeping the surface moist for a longer period.
2.4.3. To maintain the uniform mixture and to prevent segregation, the paint shall be stirred frequently in the bucket.
2.4.4. For undecorated surfaces, the surface shall be treated with minimum two coats of water proof cement paint. Not less than 24 hours shall be allowed between two coats. Next coat shall not be started until the proceeding coat has become sufficiently hard to resist marking by the brush being used. !n hot dry weather, the proceeding coat shall be slightly moistened before applying the subsequent coat.
2.4.5. The finished surface shall be even and uniform in shade, without patches, brush masks, paint drops etc.
2.4.6. The cement paint shall be applied with a brush with relatively short stiff hog or fiber bristles. The paint shall be brushed in uniform thickness and shall be free from excessively heavy brush marks. The lamps shall be brushed out.
2.4.7. Water proof cement paint shall not be applied on surface already treated with white wash, colour wash, distemper dry or oil bound varnishes, paint etc. It shall not be applied on gypsum, wood and metal surfaces.
2.5. Curing
Painted surfaces shall be sprinkled with water two or three times a day. This shall be done between coats and for at least two days following the final coat. The curing shall be started as soon as the point has hardened so as not be damaged by the sprinkling of water say about 12 hours after the application.
2.6. Protective measure
The surface of doors, windows, floors, articles, of furniture etc. and such other parts of the building not to be Water proof cement paint shall be protected from being splashed upon. Such surfaces shall be cleaned of Water proof cement paint splashed if any.
3.0. Mode of measurements and payment
3.1. All the work shall be measured in the decimal system as under:
(a) Dimensions shall be measured to the nearest 0.01 m.
(b) Area in individual item shall be worked out to the nearest 0.01 sq.m.
All the work shall be measured in sq.mt. Deductions for jambs, soffits, sills etc. for openings not exceeding 0.5 sq.mt. each in area, for ends of joists, posts, beams, girders, steps etc. not exceeding 0.5 sq.mt. each in area and for openings exceeding 0.5 sq.mt. and not exceeding 3.0. sq.mt. each in area, deductions and additions shall be made as under.
3.2. No deductions shall be made for ends of joists, beams, posts, etc. and openings not exceeding 0.5 sq mt. each. No addition shall be made for reveals, jambs, soffits, sills etc. of these openings not for finish around ends of joints, beams, posts etc.
3.3. No deductions for openings exceeding 0.5 sq.mt. but not exceeding 3 sq.mt. each shall be made as follows and no addition will be made for reveals, jambs, soffits etc. of these openings :
(a) When both the faces of walls are provided with finish, deduction shall be made for one face only.
(b) When each face of wall is provided with different finish, deduction shall be made for that side of frame for door, windows, etc. on which width of reveals is less than that of the other side. Where width of reveals on both faces of wall are equal, deduction of .50% of area of opening on each face shall be made from total area of finish.
(c) When only one face of wall is treated and the other face is not treated, full deduction shall be made if the width of reveal on the treated side is less than that on the untreated side, but if the width of the reveal is equal or more than on the untreated side neither deductions nor additions to be made for reveals, jambs, soffits, sills etc.
3.4. In case of area of openings exceeding 3 sq. mt. each, deductions shall be made for openings but jambs, soffits, sills shall be measured.
3.5. No deductions shall be made for attachment such as casing, conducts, pipe, electric wiring and the like.
3.6. Corrugated surfaces shall be measured flat as fixed and not girth. The quantities so measured shall be increased by the following percentage and the resultant shall be included with the general areas:
(a) Corrugated steel sheets: 14%
(b) Corrugated A.C. sheets: 20%
(c) Semi corrugated A.C. Sheets: 10%
(d) Nainital pattern roof (Plain sheeting sheets): 10%
(e) Nainital pattern roof (with corrugated sheets): 25%
3.7. Cornices and other wall features, when they are not picked out in a different finish/colour shall be girthed and included in the general area.
3.8 Extra payment shall be done on ceiling and sloping roofs.
3.9. The rate shall include the cost of ail materials, labour, scaffolding, protective measures etc. involved in all the operations described above.
The rate shall be for a unit of One sq. meter.
Tags:
Civil Engineering