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Saturday, May 5, 2012

FINISHING WORKS


8. FINISHING WORKS

8.1     Scope of work

Furnish all labour, materials and equipment for the completion of work as shown on the drawing and specified herein,




8.2     Plastering Work

8.2.1     materials

8.2.1.1   Juss

Juss shall be locally produced natural gypsup in iraq, and shall be fresh, completely dry and well ground material and shall not leave residuals on 56 mesh/cm sieve, and shall be free from extraneous Which may be affected by spontaneous slating. Juss shall be kept in adry area,  covered  and protected from moisture, juss shall be the best grade obtainble from an approved  source and completing with relevant Iraqi standards.

8.2.1.2 Sand

Sand for finish coats shall be clean and well graded from coarse fine as specified in concrete work

8.2.1.3 Cement

Cement shall be specified in section 4-2-1 (concrete work)

8.2.2 Plastering accessories

All plastering accessories shall be approved on samples by the Engineer before starting  plastering work. Such accessories, including corner beads, casing beads, lath  and  other  saterials,  shall  be  used  where  and  necessary  for  workmanlike plastering work.

8.2.3.1 Working environment

maintain uniform ventilation and a temperature of not lower than 5C until plastered surface are dry.

Excessively rapid drying shall be prevented.

8.2.3.2 Surface preparation

Dust, Oil, grease and other
undesirable substances that might hinder the forming of a  good  bond   with  plaster  bases  on  concrete  or  masonry  shall  be  removed immediately prior to plastering.

8.2.3.3 Moistening underbed

Immediately before applying plastering work, brick and concrete surfaces shall be wet-down sufficiently to reduce suction but shall not be excessively wet.

8.2.4 Application

All plastering shall be executed in a workmanlike manner leaving all finished plaster surfaces free from waves or imperfections.

8.2.4.1 Nixing

Plaster materials shall be thoroughly mixed with the correct amount    of water, in accordance with the specific requirements of the vorh,

8.2.4.2 Number of coatings

All worba cJic.ll be not loan than two-coats.


8.2.4.3 Standard mixing proportions

porotland cement plaster on walls

a. First coat : 1 part portland cement, 2.5 parts sand by volume. b. Finish coat : 1 part portland cement, 3 parts sand by volume.
8.2.4.4 Grouting

permeiers of door and window frames, pipes and ducts shall be grouted with cement mortar of part of cement and 3 parts sand by volume.

8.2.5 Juss Plaster

Juss plaster shall be mixed and applied in accordance with local practice . Juss plaster shall be plastered in 2 coats, each coast shall not exceed 15mm thickness. Metal lath shall be used at all corners and angles and stops.

8.2.6 Cement mortar plastering

All plastering shall be done in two coats. The first coat shall be applied as thinly as possible and in  a manner obtaining plan faces, with all angles arrises and reveals perfectly plumb and square. This coat should be well scratched to provide a key for the final coat. After completion, the plaster shall  be cured for at least 24 hours by being continuously wet.



8.3 Terrazzo

8.3.1 Materials

The terrazzo tile shall be machine made tile, composed of natural aggregate of potland cement and marble chips, formed by hydraulic press. Terrazzo floor tile shall be 300*300*25mm thick and of selected colour and pattern and it shall be complete with all necessary special shapes and corners.

Cement motar for setting the floor tile shall be approximately 25mm thick and shall be composed of 1 part Portland cement and 3 parts sand by volum. Grout for terrazzo tile floor joint consist of 1 part white cement and 2 parts clean sharp sand by volume and the width shall be 5mm .

8.3.2     Installation

The concrete floor shall be dry, firm, clean, free of grease or wax, proper adhesion shall" ber  assured between the mortar and all tiles and the finished floor surfaces shall be smooth.

Joints shall be arranged at regular intervals with due consideration to the axis of the room, joint  filling shall be executed so as not to leave any unfavorable space . All joints shall be closed joints.  No traffic of any kind or any shook shall be permitted during the 48 hours following installation of  the tiles. Mortar and grout on the tile surfaces shall be cleaned away. Tiles that are cracked or show broken corners shall be removed and replaced with sound tiles at the contractor's expense.



8.4 In situ cast Terrazzo

8.4.1     Materials

8.4.1.1 Cement

Portland cement shall be type 1, white cement shall be used for the surface layer of the terrazzo, the balance of the balance of the cement shall be gray colored.

8.4.1.2 aggregate

marble aggregates shall be crushed marble, hard and round, not flaky, free from dust or other impurities.

sizes of marble aggregates shall be as follows .

i.   All particles shall pass through a 24mm sieve

ii.   40% to 60% of the particles shall pass through a 12mm sieve. iii.  No particle shall pass through a 6mm sieve
Dividing strip or edging strips shall be of brass not less than 4.5mm thick and 12mm high. Brass shall conform with DS 2o74 or Other equivalent standards.

8.4.1.4    Pig ment shall be a lime - proof, non fading mineral pigment the same as the pigment used in Engineer approved samples and shall comply with BS 1014 or other equivalent standards.

8.4.2 Workmanship

8.4.2.1   Working environment

i.          In case of cold weather all precaution shall be exercised to avoid adverse weather, such as ambient temperature below 48 .

ii.  In case of hot weather, ensure that full compaction is not premature stiffening or drying out of mix after compaction, not prevent excessively quick drying out.

iii. In case of wet weather, protect terrazzo work from rain or snow.

8.4.2.2. Surface preparation

surface to reseive terrazzo shall be thoroughly cleaned free from dust, dirt , oil and other deleterious items.

8.4.2.3   13ond Breaker

polyethylene sheet  having  a  minimum  0.08mm  thickness  with  minimum  lapping
150mm shall be laid for separation over entiere underbed surfaces

8.4.2.4    Dividing or edging strips

Dividing or edging brass strips shall be fixed in a minimum 7000x7000mm grid with metal anchor and mortar according to layout plans, underneath each brass strip, a wooden dividing strip shall be added to complete the joining.

8.4.2.5   unbonded cement screed

mortar for unbonded shall be 1 part cement and 3 parts sand be volume with the least amount of  water required. Lay screed in two courses on hand breaker layer. The lower course shall be thicker than the upper and placed to the level about 15mm lower than the top of brass dividing strips. The top the undered shall be slightly lower along dividing strips in order to have slightly thicker finishing course.



8.5   Flooring of marble and Granite

All marbles and granites must be carefully selected from the best guarry beds, and utmost care  must be exercised to ensure that the maximum amount of adjacent marble matches accurately. All stone shall be free from cracks, holes, scratches and other blemishes. No stooping will be allowed.

All stones shall be free from cracks, holes, scratches and other blemishes. All stones shall be of the  highest quality, durable with resistance to atmospheric agents and shall pass, all the strength test   ( Compressive strength ) and shall have adequate tensile strength.

The contractor will be required immediately to produce representative samples of all the stones intended to be supplied for the employer's representative's approval, and the whole of the supply shall correspond with the approved samples. No other quality of stone will be accepted and the  contractor will be required to guarantee that the qualities will comply in all respect with specification and the samples approved by the employer's representative.

Mocked up sample panels of stone work to indicate the range of color and texture . matching of  vein, workmanship, etc. shall also presented for the approval of the Employer's representative.

All stonework is to be accurately worked, deadsquare and ture and accurately placed in the definite  position with due respect to levels, alignments and verticality and perfectly jointed and fitted against adjoining members . All visible edges will have to be  rectified  and  gauged  with  a  maximum  tolerance  of  0,5mm  on  the  gauging thickness ( and shall be finished to the same  degree of that of adjoining finished surfaces of trfcone). And + ;-1.5mm in the thickness of slab in general. The tolerance allowed in the cut of the slab, for out of joint and precision of size and squareness shall not  exceed 0.5m per 500mm.

All Exposed faces of marble are to be finished to the degree indicated on drawings and described thereon. The whole of the work will be inspected at the factory during working and upon arrival at the site and the Employer's representative will reject any material or workmanship which does not conform to the conditions and will require replacment to be made at the contractor's expense.



8.6   Quarry tiles

Quarry tile shall be unglazed semi - vitreous tile made from natural clay conforming to BS 1236 or  other relevent standards in terms of water absorption, resistance to abrasion and chemical attack, flexural strength and so forth.

Size of tile shall be 90 * 90 * 10 mm thickness and bottom surface shall have grooved Keys  to  increase  bonding  to  underbed  three  different  colours  shall  be  selected subject to the approval of the Engineer,



8.7 Sportflooring

8.7.1     Description of work

Furnish and install Sportflooring and accessories as specified herein,  shown on the drawings, and retired by the Engineer.

8.7.2     Quality Assurance

a.        Supplier shall be an established firm,  experienced in the field.

b.         The installer shall have completed at least three projects of similar magnitude and complexity,

c.       Level flooring to s tolerance of + ;- 3 mm from the true plane

8.7.3     Submittals

a.        Submit manufacturer's recommendations for the correct preperation,  finishing and testing of concrete subfloor surface to recieve the sportflooring.

b.            Submit manufacturer's specifications for installation handling, protection A
njaintance.

c. Submit 3 sets of samples of each type, color, and finish of flooring and accessory required. Sample submittals will be reviewed for color, texture and pattern only .



8.7.4 Delivery, storage and Handling

protect flooring materials and accessories from any kind of damages during delivery, storage and  handling . store in a dry place with adequate air circulation . Do not deliver flooring materials to building until all masonry, painting , plastering, tile work, overhead mechanical work, and lighting are completed.

8.7.5 Job conditions

a.  Keep  the  areas  which  receive  flooring  to  the  temperature  rerjuirod  by  the manufacturer's instructions for at least 48 hours prior to installation.

Maintain this temperature during and after installation as recommended by flooring manufacturer,

b.  Do not install floor system until concrete has been cured for (30) days and other retirements are obtained as specified.

8.7.6 Materials

8.7.6.1 General

a. Uniform in thickness and size.

b. Edges cut accurately and  square. c.  Uniform color.
8.7.6.2 Sport flooring Materials

Shall be  mond  oflex  or  indoor  flex  or  any  other  equal  quality  approved  by  the
Engineer. The length and width determined by dimensions of area to be installed and

as approved by the Engineer. The physical properties shall be as follow: Color stability ---- good,
abrasion resistance ---- excellent, resistance to cigarette ---- burns
sound isolation ---- maximum acoustic absorption.

8.7.6.3   Adhesives materials as recommended by the flooring manufacturer to suit flooring materials and substrate conditions. No substitutions.

8.7.6.4     Gome line paint shall be compatible with the floor finish surface and the same color required by the gane and as approved by the Engineer.

8.7.7 Execution

8.7.7.1   inspection

Examine the areas and conditions under which the flooring work is shown to be installed and remedy any conditions detrimental to the proper and timely completion of the work.

Do not proceed with the work until unsatisfactory conditions have been corrected in a manner acceptable for installation.

8.7.7.2 Preparation

Prior to laying flooring , broom, clean or vacuum surfaces to be covered and inspect sub floor. Use leveling compound as recommended by the flooring manufacturer for filling  small  cracks  and  depressions  in  sub  floors.  Start  of  flooring  installation indicates acceptance of sub floor conditions an and full responsibility for completed work,

8.7.7.3   Installation and finishing

a. Flooring surface

1. Unroll, perfectly fit, cut and leave unrolled to relax.

2. esive materials according to manufacturers directions. Use 3nim notched troxtfel to spread adhesive. Bo not soil walls or adjacent areas with adhesives .

3. Unroll into freshly applied adfacsinrov.

End seams shall be single cut, edge seams overlapped, then snapped into place to insure tight seam, The flooring shall be lid tight, even and straight,

4. Roll the entire sport surface with mediur-size rokker to remove any entrapped air. Wipe away any adhesive that oozes between size.
5. All seams shall be weighted in place.

Leave weight in place a minimum of twelve(l2) hours.

b.     Game  line  painting  shall  be  done  as  specified  by  the  manufacturer  of  the sportflooring.

Protect all the lines with plastic plates and make sure of avoiding any damages to


them,

c.    Finishing shall be in accordance with manufacturer current procedure, using approved materials.

d.  After sportflooring surface is installed and game lines painted , area is to be kept locked by contractor to allow curing time for paint and adhesive. No other trades are to be allowed on the floor until it is accepted by the Ehgineer.

e. Clean up all unused materials and debris and remove same from the premises.



8.8   Ceramic tile

8.8.1     Materials

Glazed ceramic wall tile shall be square edge, matte finish, glazed natural clay tile . Tile shall be free from defects which affect appearance or serviceability , will not be acceptable.

Tile shall be free from a dark spots over 0-16mm ( interior or 0.3mm exterior) in diameter, fractures in the glaze, heavy accumulations of glaze , spots in sufficiently glazed , frosted  crystalline  appearance and rough spots, ceramic tile shall be first quality, size the drawing.

8.8.2     Installation

a. Apply setting beds for tile directly to moistened concrete, concrete block, Portland cement plaster other bases, setting beds shall be composed by volume of one part Portland cement, to one half  part hydrated lime to four parts dry sand, mixed with minimum amount of water necessary to produce a workable mass. Apply in sufficient quantity and with sufficient pressure to cover well the entire area and form a good key. Bring out flush with temporary screeds or guide strips so placed  as to give a true, earen surface at the proper distance from the finished face of tile. Setting beds shall not less than 1.25cm nor more than 1- 9cm thick.

b. Joints shall be straight, level, perpendicular, and of even width. Vertical joints shall be maintained plumb for the entire height of the tile work. Tile where called for on the drawings shall have staggered joints as shown.

Each tile shall be brought to a true level plane surface by uniformly applied pressure under a straightedge , Tiles that are improperly placed shall be removed and reset. Damaged or defective tilfe shall be replaced.

c. Iteflor setting, tile shall be throughly soaked in clean water and drained so that no free moisture remains on the back of tile . Wall tile shall be set by trowelling1 a skin coat of neat portland cement on the setting bed or by applying a skin coat to the back of each tile unit and immediately floating the tile in to place. All tile special shapes, and trim pieces shall be solidly backed with mortar.

d. Grouting : Immediately after a suitable area of tile has set, grout joints full with plastic mix of  neat, white Portland cement. If desired, the contractor my add fine, white grouting sand up to an amount ecfuall in volume to the portland cement.

Wet joints before application of the grout. Force maximum grout in the joints by


squeegee, brush or finger application. Tool joints slightly concave to the edge of the cushion, and wipe excess grout frome face of tile, Allow no mortar from setting bed to show through the grout . Immediately roughon the replace grout at any depressions that apper along the face of pouted joint once the surface has been cleaned.

e. Cleaning : After grout is throughly set, sponge and wash tile throughly, diagonally a-'cross joints, and polish with clean, dry cloths.

Acid cleaners not allowed.

f. Curing : Keep joints continuously damp for a period of at least 72 hours after applying grout.



8.9     Glazed tile

8.9.1 Material

Glazed wall tile shall be used for; the interior surfaces of toilets, and be scjuare in shape of 150z150ram and white colour.

8.9.2 Installation

The Installation of glazed tile shall be accordance with section (8-8-2)



8.10    Suspended Ceilings

The Mechanical suspension system should be of an approved type. The suspension system should be of type that will be installed by direct suspension from the structural ceiling by hangers. Hangers should be at interirvals as shown on drawing and. they should be not smaller than 10mm mild steel rods.

All steel members of the suspension system should be painted .

The mechanical suspension system should be of an approved exposed grid system The exposed  suspension member shall be in width and installed as shown on the drawings.

The suspended ceilings shall be made of ribbed metal lath designed for interior one side plastering.  The metal lath should have an approved pattern and should be of email mesh that ensure good bend with the plaster and should be rigid and do not show any signs of sagging or bending when the

plaster is applied . Metal lath sheets should be lapped sufficiently. Prior to plastering the metal lath the whole surface of the lath should be treated with (1:1) cement sand slurry to form a complete coat under plaster, Whomever " Tile suspended ceiling" or "  Acoustic  Tile  suspended  ceiling"  are  specified  on  Drawings.or  in  the  Bill  of Quantities          then the tiles that shall be ased should be  Termiteproof, Rot proof, odourless,            durable, not sustaining vermin and of type approved by the  Engineer, prior to delivery tile samples shciild

be submitted to the Engineer for approval. All tiles should comply with the retirements indicated on drawings and shall have a minimum thickness of 12mm  . Tile should have dimensions approved by the Engineer.


All the ceiling materials should be handled by experienced workers. False ceiling should be fixed horizontally at the indicated elevations.

The method of fixing the suspenecl ceilings should be according to the requirements of this  specification and as shown on the drawings that will be furnished by the contractor with his bid.



8.11 Painting work

8.11.1 Description of work

This specification  section  covers  the  surface  preparation,  material,  manufacture, delivery and application of painting.

All  paints  shall  be  of  the  first  quality  and/or  standard  products  of  reputable manufacturers.

8.11.2 Surface preparation

a. Surface preparation for concrete, mortar and plaster unless otherwise specifically instructed in  the  specifications, the following procedures for preparation shall be adopted.

i. Surface shall be sufficiently dried before painting
ii. Dirt, dust and foreign matter shall be removed with care not to damage the surface. iii,  interior mortar and plaster surfaces shall first be painted with emulsion sealer and
then putty shall be applied to remedy the irregularities of surfaces, such as hair cracks, minuteholes, etc. and immediately after application, excessive putty shall be skimmed off with a wooden or iron spatula, when the putty rdries, the puttied surfaces shall be sanded with samdpaper prior to a paint application

IV. Exterior mortar surfaces shall first receive cement . filler or the like with "brush or their hair cracks minute holes, etc. Then the remedied surfaces shall be sanded with sandpaper followed by applications of solvent 'based sealer or that approved by the Engineer

V. Regarding  the  exterior  concrete,  major  irregularities  of  the  surfaces  shall  be corrected by  filling the crevices, holes, etc. with cement filler or the like. The filler shall be applied with wooden or iron spatula as smoothly as possible. When the filler dries,solvent based sealer or that approved by the Engineer shall be applied before painting.

b.     Surface preparation for wood

i,    Wooden naps, dirt and. foreign matier shall be removed by sandpaper with care hot to be damage the material.

ii.       Gum shall be burnt by an electric heating rcui or pared with wiped off with solvents.

iii.    Knots shall .then fre sealed with" two coats of shellac varnish.

IV,  For opaque finishing, cracks, holes, crevices, cavities, etc. shall be filled with oil putty.


V. Gor  transparent  finishing,  wood  grains  shall  be  filled  with  polishing  powder kneaded with boiled oil and solvent, preferred, or water.

Vi.     In order to ensure smooth surfaces , all surfaces puttied and once filled with polishing powder shall be sanded with sandpaper.

c. Surface preparation for steel.

i. Oil and grease shall be wiped off with solvents,

ii. After blasting or cleaning with a power tool, dust on the surface shall be blown off with an air-blower.

d. Surface preparation for galvanized iron.

i. Oil and grease shall be wiped off with solvent. ii. White rust shall be sanded off with sandpaper.
8.11.3 Materials

paints shall be factory manufactured and delivered to the job in unbroken container's which shall show the designated name. formula, color, Manufacturer's directions and name of manufacturer, all of which shall be planinty legible at the time of the use, the following paints, which conform to B.S specifications or their equivalent shall be used,

a. Oil paint ( on o/ood and metal surfaces) oil paint shall stand for long oil base alkyd paint for undercoat and finish coat conforming to B,S 2524 or equivalent standards,

b. Gloss emulsion paint ( on interior walls) Gloss emulsion paint shall stand for comparatively gloss rich vinyl emulsion paint.

c. Oil stain clear lacquer ( on wood )

Oil stain cleat lacquer shall stand for acrylic resin type clear lacquer finish combined with colour.

d. Polyurethane clear lacquer ( on wood )

Polyurethane clear lacquer shall stand for Polyurethane easine type clear lacquer finish combined with colour toner.

9.11.4 General rules

a.  Inflammable paints shall be in an independent, idolated and well ventilated place and sheltered avoiding direct sunlight.

b. panting places shall be ensured of good ventilation to avoid poisoning by solvents as well as prevent to afire.

c. Special attention shall paid to the preventing of fire.

Hazards fire shall be kept off from the painting places and paint stores to prevent occurrences of explosion, fire, ect, clothsand / or rugs used for wiping or soaked with  paint  may  have  a  danger  of  spontancous  combustion,  therefore,  such materials shall be immedlately disposed of.

d. Painting work shall be suspended under the following circumstances:
i. At Mospheric temperature is below 5C and relative humididty is more than



80%.



ii. During snow, rain, strong wind or days expected of such weather conditions. iii. Untidy conditions of work where good work cannot be expected.

V. Painted surfaces can be damaged or hindered by other works.



Vi. Ventilation  is  not  sufficient  enough  that  proper  drying  og  paint  can  be ensured.



e. The proper application method shall be employed to meet nature of the paint, and paint applications shall be done evenly so as not to leave blemishes, saggings runnings, wrinkles, bubbles, ect.



f. paint for finish coating shall be, as arule, prepared for special color and luster effects which shall be subject to approval of the Engineer.



Color sample, color plates, ect, shall be submitted to him.

g. Paint shall be delivered to the site sealed.

h. Paint shall be in general, used as it is, however depending on the roughness / fineness of the surface, degree of absorption, atmospheric temperature, ect, it may be adjusted by use of thinner or solvent to ensure proper painting.



i. Painted surfaces shall be well protected from  n contamination and damage until they are thoroughly dry  and floors and other surfaces adgacent to areas to be painted shall be properly or protected otherwise from stains before painting work

.commences



j. After blast or power tool cleaning of steel surfaces, primer shall be applied as soon as possible in order to avoid growth of rust.



k.  Manufacturer's instructions shall be strictly observed to ensure proper and good painting work.

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