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Subhead 7.0 covers the specifications and requirements for stone work. Below is a detailed explanation of each section along with examples.
1. Types of Stones:
Example: Using marble for the flooring in a grand entrance hall for its elegant appearance.
7.1.1 Material: Stones should be hard, durable, and free from defects.
7.1.2 Size of Stone: Stones should not exceed 30 cm in height and 3/4th the thickness of the wall in breadth.
7.1.3 Dressing: Stones should be hammer dressed to roughly rectangular shapes.
7.1.4 Mortar: Mortar for jointing should be as specified.
7.1.5 Laying: Stones should be laid on their natural beds, solidly bedded in mortar with close joints.
7.1.6 Bond Stones: Provided to ensure stability, should be spaced at specified intervals.
7.1.7 Joints: Should be fully packed with mortar and not more than 20 mm thick.
7.1.8 Scaffolding: Single scaffolding with one set of vertical supports allowed.
7.1.9 Curing: Masonry should be kept moist for a minimum of 7 days for cement mortar.
7.1.10 Measurements: Measured in cubic meters correct to two places of decimal.
Example: Building a garden wall using random rubble stone masonry to give a rustic appearance.
7.2.1 Stone: Similar specifications as random rubble stone masonry.
7.2.2 Size of Stone: Stones should be squared on all joints and beds.
7.2.3 Dressing: Face stones should be hammer dressed on all beds and joints.
7.2.4 Mortar: Mortar should be as specified.
7.2.5 Laying: Stones should be laid in courses with uniform height.
Example: Constructing the external wall of a building with coursed rubble masonry for a traditional look.
7.3.1 Stone: Same as coursed rubble masonry first sort.
7.3.2 Size of Stone: Stones should be squared on all joints and beds.
7.3.3 Dressing: Roughly dressed stones, not exceeding 40 mm from a straight edge.
7.3.4 Mortar: As specified.
7.3.5 Laying: Laid in courses with uniform height.
Example: Using second sort coursed rubble masonry for the construction of a retaining wall.
7.4.1 Stone: Should be hard, sound, and durable.
7.4.2 Size of Stone: Stones should not exceed three times their height in length.
7.4.3 Dressing: Stones should be finely dressed to a uniform finish.
7.4.4 Mortar: As specified.
7.4.5 Laying: Stones should be laid in regular courses.
7.4.6 Bond Stones: Provided as specified.
7.4.7 Joints: Should be full of mortar, not more than 6 mm thick.
7.4.8 Pointing: All exposed joints should be pointed with mortar.
7.4.9 Curing: Kept moist for a minimum of 7 days.
7.4.10 Protections: Green work should be protected from rain.
7.4.11 Scaffolding: Double scaffolding should be provided where necessary.
7.4.12 Measurements: Measured in cubic meters.
Example: Constructing a facade with plain ashlar masonry for a smooth and refined appearance.
7.5.1 Stone: As specified in 7.4.1.
7.5.2 Size of Stone: As specified in 7.4.2.
7.5.3 Dressing: Faces exposed to view should have a fine dressed chisel draft.
7.5.4 Other Details: Same as specified in 7.4.
Example: Using punched ashlar masonry for the external walls of a heritage building to match historical aesthetics.
7.6.1 Stone: As specified in 7.4.1.
7.6.2 Dressing: Every stone should be cut to the required size and shape, finely dressed.
7.6.3 Sample: A sample of dressed stone should be prepared for approval.
7.6.4 Other Details: As specified in 7.4.
7.6.5 Centering and Shuttering: Required for arch, dome, or circular moulded work.
7.6.6 Measurements: Dimensions of dressed stone used in work measured correctly.
Example: Constructing a carved stone archway with detailed mouldings for an architectural feature.
Shifted to Sub Head 8: Cladding Work.
7.8.1 Stone Slabs: Should be hard, sound, and durable.
7.8.2 Sloping Chajja: Stone should be sloped as specified.
Example: Using stone chajja for overhanging eaves in a traditional style building to protect windows from rain.
Measurements: Length, breadth, and height measured correctly.
Rate: Includes cost of all materials and labor.
Example: Installing stone coping on a parapet wall for a clean finish and protection from water ingress.
7.10.1 Stone: As specified in 7.4.1.
7.10.2 Dressing and Fixing: Stone should be cut into slabs for jali and fixed as per drawings.
7.10.3 Measurements: Measured in square meters.
7.10.4 Rate: Includes cost of materials and labor.
Example: Installing stone jali in a window opening for decorative purposes while allowing ventilation.
7.10A.1 Water Removal: Adequate measures for bailing and pumping out water during work.
7.10A.2 Pumping Capacity: Decided in consultation with Engineer-in-Charge.
7.10A.3 Classification:
Example: Constructing a foundation wall below the water table with appropriate dewatering measures.
Thu Aug 8, 2024
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