Key Facts to remember
a. Centering and shuttering/ form work:
- It is the process of attaching frame made of wooden or steel in columns, beams etc to support and to give a definite shape and size.
- For column : removal of frame at less than 48 hours.
- For side beam: removal of frame at 24 hours.
- For beam if its length is 45 cm: removal of frame after 13 days.
- For beam if its length is more than 6m. : removal of frame after 7 days.
- For cantilever: removal of frame after 7 days.
- Some more days may be added in winter season.
b. Curing
- It is the process of addition of water or ponding of water in slab which is done for 7-10 days in order to keep the concrete wet to continue the chemical reaction between cement and water.
c. Dampness
- Usually 2.5 cm thick with rich cement concrete (1: 1 ½: 3) i.e cement: sand (5mm size: aggregate (20mm size) mixed with standard water proofing matters.
- The water proofing matters are found in cem-seal/ impermo and 1 kg cemseal/ impermo (DPC) in 1 bag cement.
d. DPC (Damp proof coarse)
- Prevents superstructures from upward capillary moisture from the foundation.
- DPC is provided at the plinth level to full width of plinth wall and quantities are competed in m2 (lxb).
- DPC is not provided for doors and verandas.
e. Plastering:
- 12 mm thick.
- Unit : m2
- Smoothing shapes and size of building.
- Acts as thermal insulation.
- Long shelf life of building.
- Helps building by weathering.
- For wall, plastering is done from both sides and deduction in windows and doors is done.
f. Skirting
- 6mm thick mosaic layer over 20mm thick cement plater of 1:3 proportion of cement and coarse sand.
- It is done for easy access to cleaning.