Plaster. Cement/lime plaster for internal surfaces shall be applied in two coats, as follows: Undercoat 3/8" thick composed of 1 part cement, 4 parts lime putty, 12 parts clean washed sane, measured by volume, the whole laid evenly, straightened with a rule and scratched to form key. Finishing coat 3/8" thick composed of 1 part cement, 3 parts lime putty, 6 parts clean washed sand, measured by volume, trowelled with a steel trowel to a smooth or textured finish in accordance with samples approved by the Architect/Consultant. A minimum period of 7 days must elapse between the application of undercoat and finishing coat. The total thickness of the plaster must not exceed 3/4". Rough rendering shall be composed of cement and sand (1:4) floated to the thickness required to fill in voids behind facings, dubbing out to uneven surfaces, etc. Dubboing out must not under any circumstance exceed 1" in thickness at any point. Screeds and backings shall be composed of cement and granite fine or sane (1:3) and shall be properly laid to rules and floated to a surface suitable to receive the finishings specified. Mixing of lime/cement plaster, cement rendering and screeds shall be carried out with machine driven roller-pan mixers of a type and size approved by the Architect/Consultant. For smaller quantities, or in exceptional circumstances, the Architect/Consultant may require or approve mixing by hand on a clean dry floor or platform. Measurement of all constituents is to be made by means of gauge boxes. Gypsum plaster shall be of approved manufacture, delivered to the site in the manufacturer's sealed bags or drums, bearing the name of the manufacturer and the brand of plaster are to be in accordance with B.S.1191 for the following types - Undercoat plasters are to be borrowing or "slow setting ▇▇▇▇▇▇▇▇" of class "B", type a - retarded semi-hydrates. Finishing plaster used on undercoats is to be of Class `B' type b - retarded semi-hydrates or class "B" type c - dual-purpose plaster. Finishing plaster used or plasterboard is to be of "Board finish" type, Class "B", type b - retarded semi-hydrates. Keepe's Cement is to be dual-purpose type in accordance with class "B", type c. Plaster of Paris to be in accordance with class "B". Joints of brickwork, etc. are to be thoroughly raked out and loose particles of mortar, etc. brushed out to form key for plaster. Concrete work generally is to have a coat of "spatterdash" applied to form key for plaster, etc. The concrete shall be dampened immediately after removal of formwork and "spatterdash" consisting of 1 part of cement and 2 1/2 parts coarse sand (by volume) mixed to the consistency of a thick slurry, thrown on with a hand trowel to thickness not exceeding 1/4". The "spatterdash" shall be waited one hour after application and left to ▇▇▇▇▇▇. All pavings, wall linings, etc. are to be adequately covered up and protected until the completion of the works. The whole of the finished work to be cleaned off and left in a sound and perfect condition to the satisfaction of the Architect/Consultant & owner. Where particularly, required, pavings will not be laid until completion of all other work. Gypsum plaster to surface of concrete or brickwork is to be two-coat as follows: Undercoat composed of one part "▇▇▇▇▇▇▇" or slow setting ▇▇▇▇▇▇▇▇ plaster as described above with two parts of sand, the whole laid on evenly, straightened with a rule and scratched to form a key. Finishing coat to be as described above, applied neat of with an admixture of not more than volume by lime putty, trowelled with a steel trowel to smooth even surfaces. The total thickness of two-coat work must no exceed 1/2". Gypsum plasterboard shall be of approved manufacture and in accordance with B.S. 1230. Consisting of a core of set gypsum plaster in accordance with B.S. 1191 sandwiched between two sheets of heavy paper to a nominal thickness of 3/8". Plasterboard is to be nailed to timber bearers with 1 1/4" * ▇▇ ▇.▇.▇. galvanized screws with 3/8" dis. heads, spaced about 6 inches apart and not less than 3/4" from the edges and ends. Nailing is to commence at the centre of the board. Boards are to be spaced 1/8" to 1/4" apart at the joints and end joints are to be staggered to break bond. The boards are to be fixed and cleaned at least 24 hrs. before the application of plaster and in no circumstances should it be wetted before plastering. Gypsum plasterboard is to be prepared for plastering by filling the joints with `board finish' gypsum plaster as described above and pressing into the plaster, dry reinforcing jute scrime cloth 3 1/2" wide trowelled as flat as possible. When the plaster to the scrimed joints has set, thin coat of neat gypsum plaster is to be applied over the whole surface to level up followed immediately by a finish coat to a total thickness of 3/16". The finish coat when almost set is to be trowelled to a smooth surface using as little water as possible applied with a brush. The admixture of lime with gypsum plaster will not be permitted. Internal wall tiling is to be of a quality and equal to samples approved by the Designer as suitable for the standard of work required. Tiles are to be of `A' Grade. Indian manufacture size 4 1/4" * 4 1/4 * 6mm thick cushion edge coloured egg shell galzed tiles fixed complete with rounded nosing tiles to external angles or as specified. The tiles are to be soaked in clean water and brushed on the underside with cement slurry before bedding on a cement and sand (1:3) and painted in neat white or coloured cement. Paving composed of cement and sand (1:3) are to be trowelled smooth with steel trowel or floated with a wooden hand float as required. Dividing strips of brass, stainless steel or plastic as specified and on approval, shall be provided and bedded to, finished flush with finished floor levels between different types of pavings or where abutting wood floors. Stone flooring and cladding should be of dimensions, quality and colour as specified and shall conform to the relevant I.S. specification samples of stone materials should be got approved by the Designer/Client prior to installation allowed without extra charge, unless such variations are made after conduits, cables, etc. are fixed. All cables shall be of 1st quality manufacturer and the Main Contractor will be required to submit a samples of wiring materials to the Designer & owner, for their approval before commencing the installation.
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Sources: Construction Contract
Plaster. Cement/lime plaster for internal surfaces shall be applied in two coats, as follows: Undercoat 3/8" thick composed of 1 part cement, 4 parts lime putty, 12 parts clean washed sane, measured by volume, the whole laid evenly, straightened with a rule and scratched to form key. Finishing coat 3/8" thick composed of 1 part cement, 3 parts lime putty, 6 parts clean washed sand, measured by volume, trowelled with a steel trowel to a smooth or textured finish in accordance with samples approved by the Architect/Consultant. A minimum period of 7 days must elapse between the application of undercoat and finishing coat. The total thickness of the plaster must not exceed 3/4". Rough rendering shall be composed of cement and sand (1:4) floated to the thickness required to fill in voids behind facings, dubbing out to uneven surfaces, etc. Dubboing out must not under any circumstance exceed 1" in thickness at any point. Screeds and backings shall be composed of cement and granite fine or sane (1:3) and shall be properly laid to rules and floated to a surface suitable to receive the finishings specified. Mixing of lime/cement plaster, cement rendering and screeds shall be carried out with machine driven roller-pan mixers of a type and size approved by the Architect/Consultant. For smaller quantities, or in exceptional circumstances, the Architect/Consultant may require or approve mixing by hand on a clean dry floor or platform. Measurement of all constituents is to be made by means of gauge boxes. Gypsum plaster shall be of approved manufacture, delivered to the site in the manufacturer's sealed bags or drums, bearing the name of the manufacturer and the brand of plaster are to be in accordance with B.S.1191 for the following types - Undercoat plasters are to be borrowing or "slow setting ▇▇▇▇▇▇▇▇" of class "B", type a - retarded semi-hydrates. Finishing plaster used on undercoats is to be of Class `B' type b - retarded semi-hydrates or class "B" type c - dual-purpose plaster. Finishing plaster used or plasterboard is to be of "Board finish" type, Class "B", type b - retarded semi-hydrates. Keepe's Cement is to be dual-purpose type in accordance with class "B", type c. Plaster of Paris to be in accordance with class "B". Joints of brickwork, etc. are to be thoroughly raked out and loose particles of mortar, etc. brushed out to form key for plaster. Concrete work generally is to have a coat of "spatterdash" applied to form key for plaster, etc. The concrete shall be dampened immediately after removal of formwork and "spatterdash" consisting of 1 part of cement and 2 1/2 parts coarse sand (by volume) mixed to the consistency of a thick slurry, thrown on with a hand trowel to thickness not exceeding 1/4". The "spatterdash" shall be waited one hour after application and left to ▇▇▇▇▇▇. All pavings, wall linings, etc. are to be adequately covered up and protected until the completion of the works. The whole of the finished work to be cleaned off and left in a sound and perfect condition to the satisfaction of the Architect/Consultant & owner. Where particularly, required, pavings will not be laid until completion of all other work. Gypsum plaster to surface of concrete or brickwork is to be two-coat as follows: Undercoat composed of one part "▇▇▇▇▇▇▇" or slow setting ▇▇▇▇▇▇▇▇ plaster as described above with two parts of sand, the whole laid on evenly, straightened with a rule and scratched to form a key. Finishing coat to be as described above, applied neat of with an admixture of not more than 25% volume by lime putty, trowelled with a steel trowel to smooth even surfaces. The total thickness of two-coat work must no exceed 1/2". Gypsum plasterboard shall be of approved manufacture and in accordance with B.S. 1230. Consisting of a core of set gypsum plaster in accordance with B.S. 1191 sandwiched between two sheets of heavy paper to a nominal thickness of 3/8". Plasterboard is to be nailed to timber bearers with 1 1/4" * ▇▇ ▇.▇.▇. galvanized screws with 3/8" dis. heads, spaced about 6 inches apart and not less than 3/4" from the edges and ends. Nailing is to commence at the centre of the board. Boards are to be spaced 1/8" to 1/4" apart at the joints and end joints are to be staggered to break bond. The boards are to be fixed and cleaned at least 24 hrs. before the application of plaster and in no circumstances should it be wetted before plastering. Gypsum plasterboard is to be prepared for plastering by filling the joints with `board finish' gypsum plaster as described above and pressing into the plaster, dry reinforcing jute scrime cloth 3 1/2" wide trowelled as flat as possible. When the plaster to the scrimed joints has set, thin coat of neat gypsum plaster is to be applied over the whole surface to level up followed immediately by a finish coat to a total thickness of 3/16". The finish coat when almost set is to be trowelled to a smooth surface using as little water as possible applied with a brush. The admixture of lime with gypsum plaster will not be permitted. Internal wall tiling is to be of a quality and equal to samples approved by the Designer as suitable for the standard of work required. Tiles are to be of `A' Grade. Indian manufacture size 4 1/4" * 4 1/4 * 6mm thick cushion edge coloured egg shell galzed tiles fixed complete with rounded nosing tiles to external angles or as specified. The tiles are to be soaked in clean water and brushed on the underside with cement slurry before bedding on a cement and sand (1:3) and painted in neat white or coloured cement. Paving composed of cement and sand (1:3) are to be trowelled smooth with steel trowel or floated with a wooden hand float as required. Dividing strips of brass, stainless steel or plastic as specified and on approval, shall be provided and bedded to, finished flush with finished floor levels between different types of pavings or where abutting wood floors. Stone flooring and cladding should be of dimensions, quality and colour as specified and shall conform to the relevant I.S. specification samples of stone materials should be got approved by the Designer/Client prior to installation allowed without extra charge, unless such variations are made after conduits, cables, etc. are fixed. All cables shall be of 1st quality manufacturer and the Main Contractor will be required to submit a samples of wiring materials to the Designer & owner, for their approval before commencing the installation.
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Sources: Construction Contract