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ESTIMATION, COSTING & SPECIFICATIONS 
SUBMITTED BY 
11613,11627, 11644, 10610,11634, 11640 
REPORT ON 
ROOF SPECIFICATIONS
SPECIFICATIONS FOR THE RCC SLABS (1:2:4) 
Proportions- 
The proportions of cement concrete shall be of one part of cement, two parts of sand and four parts of aggregates by volume. 
Cement- 
The cement to be used in this work should comply with the standard requirements. 
Fine Aggregate- 
Sand to be used in this work shall be clean and coarse and shall be free from the any organic or vegetable matter. 
The sand shall be washed, if there is any trace of earth. 
Water- 
The water to be used in concrete work shall be clean ad fresh.
RCC FLOOR REINFORCEMENT 
The steel reinforcement used in RCC construction are of two types: 
Mild steel & (2) Tor steel i.e. High Yield Strength Deformed (HYSD) steel. 
In conventional RCC works, the mild steel has been replaced by the Tor steel bars except 6 mm. diameter bars. The proportions of cement concrete for the slab is (1:2:4) i.e. M15. 
All bars shall be placed as per the design by the structural engineer and utmost care shall be taken to keep them in the same position while packing concrete around them.
Centering 
The centering for the concrete work shall be sufficiently strong and rigid and in good condition so as to turn out a good smooth surface. 
The formwork shall include all forms of temporary and permanent nature required to be used during casting of concrete. 
The material for formwork shall be of timber or steel plates or plywood planks or any other suitable material as approved by the engineer. 
The props to be used for centering shall be of timber having spacing less than 1.2m.
Mixing of Concrete- 
The mixing of concrete shall be done in a mechanical mixer or by hand operations depending upon the quantity of the concrete which shall be decided by the engineer. 
For mechanical mixer, the mixing drum shall be turned at least for 1.50 minutes after all the ingredients are added and the drum shall be completely emptied every time. 
For hand mixing the, the dry concrete shall be mixed at least three times and then required quantity of water shall be added to it and this work should be done on the water tight platform.
Laying of Concrete- 
Before starting laying of concrete in position , the concrete shall be well-watered. 
The concrete shall be laid in forms and tapped in such a way that no honeycomb surface appears on the removal of forms. 
All edges and corners of the concrete surface shall remain unbroken, sharp and straight in line. The cement concrete work shall be kept well-watered for at least 20 days.
Finishing of Exposed surface- 
All exposed surfaces of the concrete work shall be finished with 12 mm. thick cement plaster of sagol finish and three coats of white or colour wash shall be applied on these exposed surfaces of concrete. 
The items of plaster and white or colour wash shall be carried out as per specifications of the corresponding items contained in this document.
THANK YOU

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Roof Specifications

  • 1. ESTIMATION, COSTING & SPECIFICATIONS SUBMITTED BY 11613,11627, 11644, 10610,11634, 11640 REPORT ON ROOF SPECIFICATIONS
  • 2.
  • 3.
  • 4. SPECIFICATIONS FOR THE RCC SLABS (1:2:4) Proportions- The proportions of cement concrete shall be of one part of cement, two parts of sand and four parts of aggregates by volume. Cement- The cement to be used in this work should comply with the standard requirements. Fine Aggregate- Sand to be used in this work shall be clean and coarse and shall be free from the any organic or vegetable matter. The sand shall be washed, if there is any trace of earth. Water- The water to be used in concrete work shall be clean ad fresh.
  • 5. RCC FLOOR REINFORCEMENT The steel reinforcement used in RCC construction are of two types: Mild steel & (2) Tor steel i.e. High Yield Strength Deformed (HYSD) steel. In conventional RCC works, the mild steel has been replaced by the Tor steel bars except 6 mm. diameter bars. The proportions of cement concrete for the slab is (1:2:4) i.e. M15. All bars shall be placed as per the design by the structural engineer and utmost care shall be taken to keep them in the same position while packing concrete around them.
  • 6. Centering The centering for the concrete work shall be sufficiently strong and rigid and in good condition so as to turn out a good smooth surface. The formwork shall include all forms of temporary and permanent nature required to be used during casting of concrete. The material for formwork shall be of timber or steel plates or plywood planks or any other suitable material as approved by the engineer. The props to be used for centering shall be of timber having spacing less than 1.2m.
  • 7. Mixing of Concrete- The mixing of concrete shall be done in a mechanical mixer or by hand operations depending upon the quantity of the concrete which shall be decided by the engineer. For mechanical mixer, the mixing drum shall be turned at least for 1.50 minutes after all the ingredients are added and the drum shall be completely emptied every time. For hand mixing the, the dry concrete shall be mixed at least three times and then required quantity of water shall be added to it and this work should be done on the water tight platform.
  • 8. Laying of Concrete- Before starting laying of concrete in position , the concrete shall be well-watered. The concrete shall be laid in forms and tapped in such a way that no honeycomb surface appears on the removal of forms. All edges and corners of the concrete surface shall remain unbroken, sharp and straight in line. The cement concrete work shall be kept well-watered for at least 20 days.
  • 9. Finishing of Exposed surface- All exposed surfaces of the concrete work shall be finished with 12 mm. thick cement plaster of sagol finish and three coats of white or colour wash shall be applied on these exposed surfaces of concrete. The items of plaster and white or colour wash shall be carried out as per specifications of the corresponding items contained in this document.