Question
Download Solution PDFHow much deduction should be made in the hollows of blocks during a hollow concrete block wall construction?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Rules for Deduction for Openings as per IS 1200 for Brickwork
No deductions are made for the following:
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Bearing of Floor and Roof Slabs: The areas occupied by the bearing of floor and roof slabs are not deducted from the masonry in the superstructure.
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Small Openings: No deduction is made for openings up to 0.1 m².
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Ends of Structural Elements: No deduction is made for the ends of beams, posts, rafters, purlins, etc., or for chajjas where the thickness does not exceed 10 cm.
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Plates and Bearing of Chajjas: No deduction is made for bed plates, wall plates, and the bearing of chajjas where the thickness does not exceed 10 cm.
Rules for Deduction in Plastering:
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Ends of Beams and Structural Elements: No deduction is made for the ends of beams, posts, rafters, purlins, etc.
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Small Openings: No deduction is made for openings up to 0.5 m², and no additions are made for the jambs, soffits, and sills of these openings.
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Medium Openings (0.5 m² to 3 m²): Deduction is made for one face only. No additions are made for the jambs, soffits, and sills of these openings.
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Large Openings (Above 3 m²): Deductions are made for both faces of the openings. Additions are made for the jambs, soffits, and sills.
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Hollow Concrete Block Walls: In estimating the materials and volume for a hollow concrete block wall, no deduction is made for the hollows.
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