TERRAZZO / PLAIN TILE FLOORING, SKIRTING, TREADS & RISERS
1.0 SCOPE :
1.1 The work covered under this specification consists of providing and laying at all levels and floors terrazzo tiles in flooring and skirting in accordance with these specifications and relevant drawings.
2.0 APPLICABLE CODES & SPECIFICATIONS :
2.1 The relevant I.S. specifications, standards and codes given below are made a part of this specification. All standards, specifications, code of practices referred to herein shall be the latest edition including all applicable amendment, revisions and additional publications.
2.2 List of Indian Standards :
No. I.S. No. I.S. Particulars
1. I.S. 1130 Specification for marble (Block, slab & tiles) 2. I.S. 1200
(Part-XI) Method of measurement building and civil engineering work (paving, floor finish, dado and skirting).
3. I.S. 2114 Code of practice for laying in-situ terrazzo floor finish.
4. I.S. 1237 Specifications for cement concrete flooring tiles 5. I.S. 1443 Code of practice for laying and finishing of cement
concrete flooring tiles 3.0 TERRAZZO TILE FLOORING :
3.1 Terrazzo tiles shall be of size specified in the item hydraulically pressed and shall be best quality obtained from approved manufacturers. The tiles shall be uniform in size, true and square, free from twist, cracks, depressions or any other defects. The wearing surface of the coloured terrazzo tiles shall consist of coloured terrazzo finish of not less than 7 mm thickness using marble chips of best available variety. The tiles shall be perfectly smooth finished and machine polished on the wearing surface and roughened or keyed on the bedding face.
3.2 The design and shade of the tile shall be as approved by the Engineer-In-charge. Samples of different varieties of tiles shall be first submitted to the Engineer-In- charge and got approved by him prior to placing the order for bulk supply. All tiles which go into the work shall strictly conform to the sample approved by the Engineer-In-charge, failing which the entire material is likely to be rejected.
3.3 Before laying the cement mortar bedding, the concrete floor surface shall be thoroughly hacked, cleaned of all mortar scales and concrete lumps etc. and washed to remove mud, dirt etc. from the surface and shall be thoroughly wetted. Unless and until the surface is approved by the Engineer-In-charge the flooring work shall not be started. A bedding of cement mortar (1:4) and of specified thickness shall then be laid evenly and to the required slope as directed. The terrazzo tiles shall then be laid on the bedding with cement floating. All tiles shall be truly and evenly set in a thick slurry of neat cement applied to the sides and bottom and over the prepared base. The tiles shall then be tamped down with a wooden mallet until they are exactly in true plane and line with the adjacent tiles. All tiles shall be extended up to the masonry wall and underside of plaster. The tiles shall be close jointed and the cement slurry oozing out through the thin joints shall be immediately wiped clean. The joints shall then be pointed with matching cement and finished neatly. 3.4 The flooring shall be kept wet and protected for at least 15 days before starting of
polishing. When the flooring is ready for polishing the joints shall be rubbed with carborundum stones so that slight projections or edges rising above the surface are leveled properly. The entire flooring shall be machined polished in 3 stages with different grades of polishing stones in the machine. The finished flooring shall be perfectly smooth, uniform and with luster on the surface. The polishing treatment shall also include a coat of grouting of tiles with matching cement after the first stage of polish. After the final polish oxalic acid crystals ground into powder shall be dusted over the surface at the rate of 32.5 gm/m2 sprinkled with water and rubbed hard with a pad of woolen rags by means of polishing machine. The finished floor shall give a uniform shade of tiles and any defective tiles or scratches in tiles etc. are observed the same shall be made good at contractor’s own cost.
4.0 TERRAZZO TILE SKIRTING :
4.1 Terrazzo tiles in skirting shall be of specified sizes in the item hydraulically pressed and shall be obtained from the same source as for the terrazzo tiles for flooring. The design and shade of the skirting tiles shall be exactly similar to that of the flooring tiles. The specifications for materials and workmanship shall be same as for flooring except that the skirting tiles shall be laid against 20 mm thick bedding of cement mortar (1:3) to the full height of skirting. The skirting tiles shall be in true plane, level and plumb. The skirting shall be laid projected beyond the finished plastered surfaces. The continuous horizontal grooves at the top of the skirting shall be provided if required as per drawing or as directed by the Engineer-In-charge. No extra will be paid for such grooves.
4.2 The skirting shall be cured for 7 days.
4.3 The skirting shall be polished with hand to attain the same finish as for the flooring.
4.4 The specifications for dados will be the same as for skirting. The tile size however, will be 250 mm x 500 mm x 20 mm or as specified.
5.0 TERRAZZO TILE TREADS & RISERS:
5.1 The specifications mentioned for Terrazzo stone flooring shall be generally applicable for this item.
6.0 MODE OF MEASUREMENT :
6.1 Measurement for flooring shall be clear distance between the finished (skirting) surfaces. Deduction shall be made for columns, projections, equipment foundations, trenches, openings etc. Unit of measurement shall be square metre.
6.2 The measurement shall be the actual area of skirting, dado etc. and deduction shall be made for the areas not covered by the same. Unit of measurement shall be square metre.
7.0 PLAIN CEMENT TILE FLOORING & SKIRTING :
7.1 The specifications, mode of measurements etc. in respect of terrazzo tiles in flooring and skirting shall be applicable in general to plain cement tiles except that no marble chips & white cement shall be used in tile manufacture.
8.0 IN-SITU TERRAZZO FLOORS,SKIRTING, TREADS OF STAIRCASE, WINDOW SILLS, ETC.
8.1 FLOORING :
8.1.1 In situ terrazzo flooring, the under layer shall consists of cement concrete mix 1:2:4 (the maximum size of aggregate used shall not exceed 10 mm.) the thickness of which shall be as specified in item of schedule of quantities.
8.1.2 The terrazzo topping shall consist of white cement or grey cement wherever specified in the schedule of quantity with or without pigment and marble chips of best approved quality, shade and grade all mixed in proper proportion as provided in I.S. 2114 and/ or approved by the Engineer-in-charge. The total combined thickness of the under layer and topping shall as provided in the I.S. Specification and as specified and approved by the Engineer-in-Charge.
8.1.3 The floor surface shall be thoroughly cleaned of all dirt, dust, laitance and loose material, thoroughly wet with water and then smeared with cement slurry. Cement concrete under layer immediately be laid in regular bays not exceeding 1.5 sq.m. in area or as directed and allowed to harden. The surface of screed shall be well scratched whilst it is not sufficiently hard to form key for terrazzo topping. 25 x 1.5 mm. aluminium dividing strips or 3mm. thick glass dividing strips or whichever specified in the item of schedule of quantities shall be placed to form bays as directed. When the screed has sufficiently hardened but not later than 24 hours, it shall be thoroughly cleaned down, washed with water and brushed over with neat cement slurry of about the consistency of thick cream. Terrazzo top layer shall then be laid in alternative bays in plastic condition, well troweled into position. Surplus moisture and cement slurry from surface shall be removed and allowed to set sufficiently hard to stand machine or hand grinding, thoroughly cleaned to reveal surface voids, and grouted with neat cement of the same tint as used in terrazzo. When dry and hard, machine grinding with grit blocks as per specifications for terrazzo tiles shall be done with 3 to 5 days between successive grinding during which the terrazzo shall be cured and grouted with neat cement of same tint, if required. The entire surface shall then be kept wet for at least seven days. The edges of treads and window sills shall have straight edges and corners properly rounded up. In case of window sills, only top layers is covered under the relevant item and concrete base layer under RCC item. The window sills and treads of staircase shall be hand polished instead of machine polished.
8.1.4 Cleaning and applying oxalic acid shall be same as specified for terrazzo tile flooring.
8.2 IN-SITU SKIRTING & DADO ETC. :
8.2.1 In situ skirting and dado shall be as specified in the schedule of finishes.
8.2.2 The surface shall be prepared as per plastering work where required by the architects, the dado or skirting shall be sectionalised as for in situ floor. If shown and required, the junction of the floor and dado shall be rounded to a proper, neat and uniform round to the satisfaction of the Engineer-in-charge. After the work is complete, the surface shall be kept continuously wet for 7 days. Unless otherwise specified, skirting and dado shall match the floor.
8.2.3 Terrazzo skirting and dado shall consist of under coat of 1:4 cement- sand plaster of the thickness specified. This shall be laid simultaneously with the borders of the flooring and same joints as in the floor shall continue. The topping shall be terrazzo as per specifications for in-situ terrazzo flooring except that in-situ polishing shall be done by hand to the satisfaction of Engineer-in-charge. 1.5 mm. thick aluminium strip joint ( wherever mentioned 3mm. glass strips or as specified shall be fixed) shall be provided in situ terrazzo in both direction or as directed. Care shall be taken to see that the terrazzo in skirting and dado matches the floors. The dado work in columns shall be done in one operation for the full height of the column. The shape of the finished surface shall be uniform for all such columns treated and checked for its accuracy during the progress of work.
8.3 MODE OF MEASUREMENT :
8.3.1 Mode of measurement for cast-in-situ terrazzo flooring and dado shall be same as per terrazzo tile flooring and skirting.
8.3.2 The rate shall include all materials, curing, rounding of junctions, labour, scaffoldings etc.
SPECIFICATIONS FOR