CPWD Specification, Roofing

Table of Contents

CORRUGATED GALVANISED STEEL SHEET ROOFING

Measurements

  1. The length and breadth shall be measured correct to a cm. Area shall be worked out in sqm correct to two places of decimal.
  2. The superficial area of roof covering shall be measured on the flat without allowance for laps and corrugations. Portion of roof covering overlapping the ridge or hip etc. shall be included in the measurements of the roof.
  3. Roof with curved sheets shall be measured and paid for separately. Measurements shall be taken on the flat and not girthed.
  4. No deduction in measurement shall be made for opening upto 0.4 sqm and nothing extra shall be allowed for forming such openings.
  5. For any opening exceeding 0.4 sqm in area, deduction in measurements for the full opening shall be made and in such cases the labour involved in making these openings shall be paid for separately.
  6. Cutting across corrugation shall be measured on the flat and not girthed. No additions shall be made for laps cut through.

RIDGES AND HIPS OF PLAIN GALVANISED STEEL SHEETS

Measurement

  1. The measurements shall be taken for the finished work in length along the centre line of ridge or hip, as the case may be, correct to a cm.
  2. The laps in ridges and hips and between ridges and hips shall not be measured.

VALLEY AND FLASHING OF PLAIN GALVANISED STEEL SHEETS

Measurements

  1. The length of the valleys and flashing shall be measured for the finished work correct to a cm.
  2. The laps along the length of the valley or flashing pieces, including the portion embedded in masonary, shall not be measured.

GUTTERS MADE OF PLAIN GALVANISED STEEL SHEETS

Measurements

  1. Measurements shall be taken for the finished work along the centre line of the top width of the gutter connection to a cm.
  2. The hooked lap portion in the junctions and gutter lengths shall not be measured.
  3. The number of brackets which are fixed to purlins with stiffener flats should be measured.

NON-ASBESTOS REINFORCED BY ORGANIC FIBRES AND/OR INORGANIC SYNTHETIC FIBRES CEMENT CORRUGATED SHEET ROOFING

Measurements

  1. Length and breadth shall be measured correct to a cm and its area shall be calculated in square metres correct to two places of decimal.
  2. The superficial area of roof coverings shall be measured on the flat without allowance for laps and corrugations. Portions of roof covering overlapping the ridge or hips etc. shall be included in the measurements of the roof.
  3. Roof with curved sheets shall be measured and paid for separately. Measurements shall be taken on the flat and not girthed. The breadth of the roof shall be measured along the rest of the curved sheets.
  4. No deductions in measurements shall be made for opening upto 0.4 sqm and nothing extra shall be allowed for forming such opening.
  5. For any opening exceeding 0.4 sqm in area, deduction in measurements for the full opening shall be made and in such cases the labour involved in making these openings shall be paid for separately.
  6. Cutting across corrugation shall be measured on the flat and not girthed.

NON-ASBESTOS REINFORCED BY ORGANIC FIBRES AND/OR INORGANIC SYNTHETIC FIBRES CEMENT SEMI-CORRU-GATED SHEET ROOFING

Measurements

  1. Length and breadth shall be measured correct to a cm and its area shall be calculated in square metres correct to two places of decimal.
  2. The superficial area of roof coverings shall be measured on the flat without allowance for laps and corrugations. Portions of roof covering overlapping the ridge or hips etc. shall be included in the measurements of the roof.
  3. Roof with curved sheets shall be measured and paid for separately. Measurements shall be taken on the flat and not girthed. The breadth of the roof shall be measured along the rest of the curved sheets.
  4. the end lap of the sheets under asbestos cement expansion joints where provided shall also be included in measurements. Gap between the sheets under expansion joint shall not be measured. The expansion joint sheets shall be measured for the finished work correct to one cm.
  5. No deductions in measurements shall be made for opening upto 0.4 sqm and nothing extra shall be allowed for forming such opening.
  6. For any opening exceeding 0.4 sqm in area, deduction in measurements for the full opening shall be made and in such cases the labour involved in making these openings shall be paid for separately.
  7. Cutting across corrugation shall be measured on the flat and not girthed.

RIDGES AND HIPS OF NON-ASBESTOS REINFORCED BY ORGANIC FIBRES AND/OR INORGANIC SYNTHETIC FIBRES CEMENT

Measurements

  1. The measurements for ridges and hips shall be taken for the finished work along the centre line of the ridge and hip lines in length, correct to a cm.
  2. The laps in adjacent ridges or hip pieces shall not be measured.
  3. The underlay of ridges under expansion joint pieces where the latter are provided shall however be measured.

OTHER ROOFING ACCESSORIES OF NON-ASBESTOS REINFORCED BY ORGANIC FIBRES AND/OR INORGANIC SYNTHETIC FIBRES CEMENT

Measurements

  1. The accessories group (a) finishing pieces, eaves filler pieces, northlight and ventilator curves, barge boards and expansion joint sheets shall be measured for finished work in length correct to a cm. Laps between adjacent pieces shall not be measured.
  2. The accessories group (b) ridge finials, cowl type ventilators, curved boards for northlight, curves, roof light expansion joints for ridge and expansion joints for northlight curves shall be measured and paid for in number. This applies in the case of finial too where the unit shall consist of a pair of inter locking pieces.
  3. The ‘S’ type louvers shall be measured for the finished work in length of each row of louvers correct to a cm. The laps, between adjacent pieces of louvers will not be taken into account in the measurements.

EAVES AND VALLEY GUTTERS OF NON-ASBESTOS REINFORCED BY ORGANIC FIBRES AND/OR INORGANIC SYNTHETIC FIBRES CEMENT

Measurements

  1. The measurement of gutters shall be taken for the finished work in length correct to a cm along the centre line of the gutters.
  2. The measured length of the finished gutters will include the length over accessories such as drop ends, stop ends, nozzles and angles, though the rate for the same shall not include the cost of the accessories unless specially described in the item.
  3. Laps between the adjacent pieces of gutter and gutter section or between gutter section and accessories shall not be measured.
  4. Accessories such as drop ends, stop ends, nozzles and angles shall be measured and paid for separately.
  5. Union clips (loose sockets) shall not be measured separately as they are included in the rate for gutters.

PAINTING OF ROOF SLAB WITH HOT BITUMEN

Measurements

  1. The superficial area of the surface painted shall be measured in square metres.
  2. No deduction in measurements shall be made for unpainted areas of roof slab occupied by chimney stacks, roof lights etc. of areas, each upto 40 sq. decimetre.
  3. The measurements of length and breadth shall be taken correct to a cm.

MUD PHUSKA TERRACING WITH BRICK TILE PAVING

Measurements

  1. Length and breadth shall be measured correct to a cm.
  2. The measurements shall be taken for the finished work, (mud phuska terracing of stipulated thickness with mud plaster, gobri leaping and tile paving and grouting) over the tiled surface, in superficial area.
  3. No deductions in measurements shall be made for either openings or recesses for chimney stacks, roof lights or khurras, of area upto 0.40 sqm. No extra shall be paid either for any extra materials or labour involved in forming such openings, recesses etc.
  4. For areas exceeding 0.40 sqm deductions will be made in the measurements for the full opening but extra shall be paid for any extra labour, materials etc. in forming such openings.
  5. For plus or minus deviation from the average thickness stipulated for the mud phuska in the item, payments will be adjusted in the rate admissible to the contractor for the relevant schedule item provided that such deviations were authorized by the Engineer-in-Charge in writing.

PAVING OVER MUMTY ROOFS WITH BRICKS TILE

Measurements

  1. Length and breadth shall be measured correct to a cm.
  2. Measurements shall be taken for the finished work in superficial area covered.
  3. No deduction in measurement shall be made for either openings or recesses for chimney stacks, roof lights, or for khurras, for areas upto 0.40 sqm nor extra shall be paid for forming such openings.
  4. For similar areas exceeding 0.40 sqm deduction shall be made in measurements for all openings but nothing extra shall be paid for forming such openings.

CEMENT CONCRETE GOLA

Measurements

  1. The length of the finished gola shall be measured at its junction with the wall face correct to a cm.
  2. No deduction shall be made in measurements for gaps for water outlets.

KHURRAS

Measurements

  1. Khurras shall be counted in numbers.

RED OR WHITE SAND STONE ROOFING

Measurements

  • Length and width of finished stone slab work including bearing shall be measured correct to a cm. The area shall be calculated in sqm correct up to two places of decimal.
  • No deduction in area shall be made for openings in roof slab for chimney, stacks, roof lights etc. of area upto 0.40 sqm nor any extra shall be paid for extra labour, materials etc. involved in cutting and wastage, in forming such openings.
  • For openings exceeding 0.40 sqm in area, deduction shall be made in measurements for the full opening but extra shall be paid for extra labour, material etc. required in forming such openings.

WOODEN CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be worked out to nearest 0.01 sqm.
  2. The superficial area of the finished work ceiling shall be measured in square metres.
  3. No deduction in measurements shall be made for openings of areas upto 0.40 sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings. For openings exceeding 0.40 sqm in area, deductions in measurements for the full opening will be made and in such case any labour involved in making these openings shall be paid for separately in running metres.
  4. Wooden ceiling of boardings fixed to curve surfaces in narrow widths shall be measured and paid for separately and shall include making the joints to proper splay.
  5. Circular cutting and waste shall be measured and paid for separately in running metres.

CEILING WITH FIBRE INSULATING BUILDING BOARDS

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be worked out to nearest 0.01 sqm.
  2. The superficial area of the finished work ceiling shall be measured in square metres.
  3. No deduction in measurements shall be made for openings of areas upto 0.40 sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings. For openings exceeding 0.40 sqm in area, deductions in measurements for the full opening will be made and in such case any labour involved in making these openings shall be paid for separately in running metres.
  4. Wooden ceiling of boardings fixed to curve surfaces in narrow widths shall be measured and paid for separately and shall include making the joints to proper splay.
  5. Circular cutting and waste shall be measured and paid for separately in running metres.

PARTICLE BOARD /MULTIPURPOSE CEMENT BOARD CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be worked out to nearest 0.01 sqm.
  2. The superficial area of the finished work ceiling shall be measured in square metres.
  3. No deduction in measurements shall be made for openings of areas upto 0.40 sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings. For openings exceeding 0.40 sqm in area, deductions in measurements for the full opening will be made and in such case any labour involved in making these openings shall be paid for separately in running metres.
  4. Wooden ceiling of boardings fixed to curve surfaces in narrow widths shall be measured and paid for separately and shall include making the joints to proper splay.
  5. Circular cutting and waste shall be measured and paid for separately in running metres.

PLAIN/SEMI PERFORATED PARTICLE BOARD TILES CEILING

Measurements

  1. Length & breadth of the finished ceiling shall be measured correct to a centimetre. The area shall be calculated in square metre correct to two decimal places.
  2. No deduction shall be made for making openings for electrical, air conditioning, fire fighting fixtures nor shall extra payment be made either for extra materials or labour involved in making such openings.

G.I. METAL TILES CEILING

Measurements

  1. Length & breadth of the finished ceiling shall be measured correct to a centimetre. The area shall be calculated in square metre correct to two decimal places.
  2. No deduction shall be made for making openings for electrical, air conditioning, fire fighting fixtures nor shall extra payment be made either for extra materials or labour involved in making such openings.

TRANSLUSCENT WHITE ACRYLIC PLASTIC (PMMA) SHEET CEILING

Measurements

  1. Length & breadth of the finished ceiling shall be measured correct to a centimetre. The area shall be calculated in square metre correct to two decimal places.
  2. No deduction shall be made for making openings for electrical, air conditioning, fire fighting fixtures nor shall extra payment be made either for extra materials or labour involved in making such openings.

PLASTER OF PARIS (GYPSUM ANHYDROUS) CEILING OVER WOODEN STRIPS

Measurements

  1. Length and breadth of superficial area of the finished work shall be measured correct to a cm. Area shall be calculated in square metre correct to two places of decimal.
  2. No deduction will be made to openings of areas upto 0.40 sqm nor shall extra payment be made either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.40 sqm in area, deduction in measurements shall be made but extra payment will be made for any extra material or labour involved in making such openings.
  4. Curved surfaces shall be measured and paid for separately from flat surfaces. The work shall be deemed to comprise of flat surfaces only unless specifically stated otherwise in the description of the item.
  5. Any sunk or raised mouldings in the plaster shall be measured and paid for separately, deductions being made from plastering on ceiling only if the width exceeds 15 cm. Ceiling at a height greater than 5 metres shall be so described and measured separately stating the height.

THERMAL INSULATION FOR ROOFING With Cellular Concrete

Measurements

  1. Length and breadth of the roofing insulation shall be measured correct to a cm and the surface area worked out in square metre of the finished work.
  2. No deduction shall be made for openings of areas upto 0.40 sqm. No extra payment will be made for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.40 sqm in area, deduction for the full opening will be made, but nothing extra will be paid for any extra material or labour involved in forming such openings.

THERMAL INSULATION FOR ROOFING With Resin Bonded Fibre Glass Wool (Bonded Mineral Wool)

Measurements

  1. Length and breadth of the roofing insulation shall be measured correct to a cm and the surface area worked out in square metre of the finished work.
  2. No deduction shall be made for openings of areas upto 0.40 sqm. No extra payment will be made for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.40 sqm in area, deduction for the full opening will be made, but no extra will be paid for any extra material or labour involved in forming such openings.
  4. Boarding fixed to curved surfaces in narrow widths shall be measured and paid for separately.
  5. Circular cutting and waste shall be measured and paid for separately in running metres.

THERMAL INSULATION FOR ROOFING With Expanded Polystyrene

Measurements

  1. Length and breadth of the roofing insulation shall be measured correct to a cm and the surface area worked out in square metre of the finished work.
  2. No deduction shall be made for openings of areas upto 0.40 sqm. No extra payment will be made for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.40 sqm in area deduction for the full opening will be made, but nothing extra will be paid for any extra material/labour involved in forming such openings.

THERMAL INSULATION FOR ROOFING With Exfoliated Vermiculite

Measurements

  1. Length and breadth of the roofing insulation shall be measured correct to a cm and the surface area worked out in square metre of the finished work.
  2. No deduction shall be made for openings of areas upto 0.40 sqm. No extra payment will be made for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.40 sqm in area, deduction for the full opening will be made, but nothing extra will be paid for any extra material or labour involved in forming such openings.
  4. Boarding fixed to curved surfaces in narrow widths shall be measured and paid for separately.
  5. Circular cutting and waste shall be measured and paid for separately in running metres.

HEAT RESISTANCE TERRACE TILES

Measurements

  1. Heat resistance terrace tiles shall be measured as laid in square metre correct to two places of decimal. For length and breadth dimensions correct to a cm including skirting shall be taken.
  2. No deduction shall be made nor extra paid for voids not exceeding 0.20 sqm.
  3. Deductions for ends of dissimilar materials or other articles embedded shall not be made for areas not exceeding 0.10 square metre. Nothing extra shall be paid for use of cut tiles nor for laying the floor at different levels in the same terrace.

THERMAL INSULATION OVER EXISTING WALL WITH FIBER GLASS WOOL

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening will be made.

CALCIUM SILICATE TILES FALSE CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening in multiple of area of each tile (0.36 Sqm) will be made.

CALCIUM SILICATE BOARD FALSE CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening in multiple of area of each tile (0.36 Sqm) will be made.

THERMAL INSULATION OF CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening will be made.

THERMAL INSULATION OVER EXISTING FALSE CEILING

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening will be made.

THERMAL INSULATION OVER EXISTING WALL

Measurements

  1. Length and breadth shall be measured correct to a cm. Areas shall be calculated nearest to 0.01sqm.
  2. No deduction in measurements shall be made for openings of areas upto0.36 Sqm. Nothing extra shall be payable either for any extra material or labour involved in forming such openings.
  3. For openings exceeding 0.36 sqm in area, deductions in measurements for the full opening will be made.