Plastering and Pointing details
Plastering and Pointing * Plastering is to give a smooth and decorative surface to walls and ceiling. It gives protection to walls from rodents, insects and atmospheric action. * Types of mortars used are mud plaster and lime plaster. 1. Mud plaster It is for low cost houses in which brickwork is also in mud. Ten per cent of clay content should pass through 2.36 mm sieve and not less than 75 per cent should pass through 850 micron sieve. For making mortar, soil is mixed with water and left for 1–2 weeks. Then dried and reduced to powder and mixed with 33 kg of chopped straw is mixed and plenty of water. 2. Lime plaster Hydraulic lime should be ground dry with sand in the ratio 1 : 2 and left for 2–3 weeks before regrounding and using. In case of fat lime the mix proportion used is 1 : 3 or 1 : 4 which are wet mixed. To improve binding property a kind of gum known as gugal is added to lime. The gugal added is about 16 N/m3 . About 10 N of fibres of jute also added to per cubic metre of ...