- 2076 Asoj · 2 marks
Multiplying factors for painting doors
Short answer
For painting, measure the door or window opening area including frame and multiply by a factor per side: panelled door 1.30, flush door 1.20, louvered door 1.80, glazed window or door 0.80. These account for extra panel, slat and frame surfaces.
Explain the multiplying factors adopted in painting of panelled door, flush door, louver door and glazed window.
Painting of doors and windows is measured as the area of the opening (length x breadth, including the frame), taken on one face. Because the actual surface is larger than this plain area (panels, mouldings, louvers, edges, frame, etc.), the area is multiplied by a factor that accounts for the extra surface. Typical factors as per IS 1200 (Part 15), for each side painted:
| Type of door/window | Multiplying factor |
|---|---|
| Panelled, framed and braced door | 1.30 |
| Flush door | 1.20 |
| Louvered (venetian) door | 1.80 |
| Glazed (fully glazed/sash) window or door | 0.80 |
Reasons: a panelled door has recessed panels and mouldings, so its surface area exceeds the plane area by about 30%. A flush door has a flat face, and only the edges and the frame add to it, so the factor is slightly above 1. A louvered door has angled slats exposed on both sides, so the factor is large. In a glazed one, part of the opening is covered by glass, so less surface needs painting, though the frame, bars and edges still do.
Example: panelled door 1.0 x 2.1 m = 2.1 m²; painting area per side = 2.1 x 1.30 = 2.73 m². The factors should be checked against the current edition of the IS code or the Nepal norms used.
✓ Answer checked by Claude Opus 5.5 (high effort)
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