Correct Answer - Option 3 : 14%
Concept:
As par IS 1200 ( Part 13 ) : 1994
Corrugated surfaces shall be measured flat as fixed and not girthed Quantities so measured shall be increased by the following percentage and the results shall be included in general areas.
- Corrugated steel sheets 14%
- Corrugated asbestos cement sheets 20%
- Semi–corrugated asbestos cement sheets 10%
- Nainital pattern roofs ( plain sheeting with rolls ) 10%
- Nainital pattern roofs with corrugated sheets 25%
1. Cornices and other wall features, when not picked out in a different finish/colour, shall be girthed and included in the general area.
2. The painting for building surfaces shall be kept separate and the surfaces to be painted shall be described. It shall be stated whether measurements are flat or girthed. Alternatively. different surfaces may be grouped into one general item, areas of uneven surfaces are converted into equivalent plain areas by increasing the areas as under:
- External walls of plain brickwork faced with recessed, raised or weather stuck pointing-20 percent
- Sand face plaster with up to 4 mm Size 50 percent
- Roughcast plaster with stone aggregate up to 10 mm-IOO percent
- Pebbledash finish beyond 10 mm-275 percent
- Sponge finished plaster-25 percent
