Measurement of plaster work and cornice

i) Plaster work

• Unit: m² (measurement and payment).
• Method: the length and height of the wall surface are measured on each plastered face (floor to ceiling or the top of the plastered area). Each face is measured separately, as internal and external plaster have different mortar mixes and thicknesses.
• Deductions (IS 1200 Part 12): openings up to 0.5 m² - no deduction; 0.5 to 3 m² - deduct one face only; above 3 m² - deduct both faces. Reveals are not added for openings up to 3 m², and are measured and added for larger openings.
• Plaster of skirting, dado, ceiling, band, and curved surfaces is measured separately where the rate differs. The thickness (12 or 15 mm), the mortar (1:4, 1:6) and the type of surface (brick, concrete) are stated in the item.
• Example: wall 5 m x 3 m with a door 1 m x 2.1 m on both plastered faces: area = 2 x (5 x 3) - 2.1 (once, as the opening is 0.5 to 3 m²) = 27.9 m².

ii) Cornice work

• Unit: running metre (m) for a cornice of given profile and girth. Where the cornice is large, it may be measured in m³ for masonry/concrete and m² for plaster.
• Method: the length is measured along the centre line of the cornice, over the wall faces on which it runs, without deduction for corners; the size (girth, projection, depth) and the mortar are stated in the description.
• Plastering of the cornice surface is measured along its girth, m x girth in m², unless included in the running metre item.