Construction of residential building required following paper work before the start of actual construction. These steps are;
Preparation of drawings as per requirements of consumers, Estimation of material cost, labor cost & contingencies, Approval of drawings & estimates from Client.
Approval of drawings from City Development Authority. It is most important because residential building drawings should meet the authority defined rules. Marking of plot boundaries, Cleaning of plot, Preparation of site layout as per drawing.
EARTH WORK
Floor levels of residential buildings are higher than the natural ground level. Fill the area with soil up to floor levels and compact the soil. Now earth work of residential building is finished.
CONCRETE WORK IN FOUNDATION
It is very necessary to check the levels of foundation before concrete work. There are patches where excavated depth slightly exceeds and vice versa. Now pour the concrete as per drawing specs. Generally concrete of ratio 1:4:8 is used for foundation. Sometimes it is even 1:5:10 or 1:6:20.
Here 1:4:8 means;
1 part cement per cubic, 4 parts of sand per cubic, 8 parts of coarse aggregates
Depth of foundation varies from 9” to 18” and normally for most of the cases it is considered as 12’’ depth. Keep foundation width equals to its depth.
To protect walls from moisture, a layer of damp proof coarse material is laid down at floor level. Thickness of this concrete layer is 0f 1 inch. Material of damp proof coarse layer consists of concrete ratio 1:1.5:3 with a mixture of water proof material 1kg/bag.
MASONRY WORK
Masonry work is carried out with cement mortar. Cement mortar is a mixture of cement & sand. Ratio of cement mortar varies from 1:4 to 1:6. Here (1:6) mean, 1 part cement and 6 parts of sand. Dampen about 25 bricks with a hose pipe and clean away all loose dirt from the top of footing and moisten about a meter of surface at one end of the foundation with the hose pipe.
LINTEL
Masonry work of buildings is carried out in one go till roof. Openings for windows & doors are left during masonry works. Reinforced cement concrete beams are laid down on the top of openings.
ROOFING
Roof slab of building is poured after completion of masonry works. Now a days, roofing is of reinforced cement concrete slab. Slab thickness & reinforcement details should be according to approved drawings.
PLASTERING & POINTING
Form work is removed after 14 days of slab pouring. Now plaster work begins. Mortar for plaster work is generally of 1:3 or 1:4 is used. Thickness of plaster layer should not be more than 0.75inch. Cure the surface about 7 days. So that, plaster gain proper strength.
DOORS & WINDOWS
The wooden doors & windows, frames are fixed in walls during masonry work. Panels are then fixed with hinges after plaster work. Steel and aluminum doors are fixed after completion of paint work.
SERVICES
Services are very important for every single house. Different types of services are provided during construction. These are Electricity supply, gas supply, water supply, sanitary etc. Conduits for electric supply are fixed in walls before plastering.