There are many methods used for calculating quantities of materials. Which one goes with your plan depends on the design and shape of the building. Each method is characteristically different from other. Calculation of quantities of material needs a proper technical understanding of materials and construction.
The five major methods are described here for you and they come up with the right measurement of materials you need.1. Centre Line Method: Centre line method is applicable to the square building with symmetrical offsets. To calculate the quantities of materials, you need to multiply the total centre line length with breadth and depth of the construction.
The centre line length will be reduced by half of breadth of every junction where the main wall is joined with the cross walls, partitions or verandah. The junctions must be taken into consideration while calculating the centre line length of a wall. The quantity estimation brought out by this method is accurate and fast.2.
Crossing method: Crossing method is designed for calculating materials needed for masonry walls. In this method, the lengths and breadths of walls at plinth level (the base on which a column is raised) are included. The internal dimension of the room and the thickness of the walls are also important to calculate the quantities.
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How to calculate cement sand and aggregate quantity in concrete | material quantity calculation |
Symmetrical offsets should be counted as they play a major role in the calculation of quantity of materials.3. Out to out and in to in method: This method follows P.W.D system for computing materials and this seems to be the most accurate method among all.4.
Bay method: This bay method is applicable in garages, factory, and railway platform where identical structures are visible. Bay in a construction term means a compartment of a building. The cost of one room is calculated first and it is multiplied by the number of bays.5. Service unit method: The term service unit method is designed for building with identical rooms.
This method is applicable in the construction of college, hospital, cinemas, prison, and more. When it is a construction of a hospital, the service unit will be a bed. Likewise, for cinema/stadium, it is seats. Calculating quantities of materials follow the above-mentioned methods.
What is quantity estimation of building materials?
Quantity estimation of building materials is essentially required in any construction works and quantity of materials depend on the mix proportions of the concrete. In our previous article, we have already discussed how to calculate bricks in a wall.
How to estimate the quantity of materials required for concrete works?
(a) Quantity Estimation Guide for Concrete Works – The materials that are required for the production of normal weight concrete are cement, sand, coarse aggregates, and water. For normal strength concrete, the quantity of cement varies with the concrete grade, while the quantity of sand and coarse aggregate remains approximately constant.
- To estimate the quantity of materials required for concrete works, the first step is to calculate the volume of concrete required for the job.
- For slabs ; the volume of concrete required (m 3 ) = Area of the floor slab (m 2 ) × thickness of slab (m) For beams; the volume of concrete required (m3) = Depth of beam (m) × width of beam (m) × length of the beam (m) For columns ; the volume of concrete required (m 3 ) = length of column (m) × width of column (m) × height of column (m) For instance, for a (230 x 230)mm column in a duplex, the volume of concrete required is 0.16 m 3 (i.e 0.23 m × 0.23 m × 3m = 0.16 m 3 ) assuming that the storey height is 3 m.
This volume can be multiplied by the number of columns in the building to obtain the total volume of concrete required for casting all the columns in the building. After obtaining the volume of concrete required, the quantity of materials required for the production of one cubic metre of concrete can be estimated as follows; (i) 7 bags (350 kg) of cement is required to produce one cubic metre (1m 3 ) of grade 25 concrete (ii) 1200 kg (1.2 tonnes) of sand is required to produce one cubic metre (1m 3 ) of grade 25 concrete (iii) 1400 kg (1.4 tonnes) of granite is required to produce one cubic metre (1m 3 ) of grade 25 concrete (iv) 175 – 210 litres of water is required to produce one cubic metre (1m 3 ) of grade 25 concrete The quantities listed above require no additional allowance for waste.
What is material quantity (MQ) in construction?
Easy Way To Calculate Of Quantity Of Materials From BOQ | | Quantity-of-materials Easy Way To Calculate Of Quantity Of Materials From BOQ It takes a lot of materials for construction work, but I will teach you how to easily you calculate the general materials for building a building. What is Material Quantity (MQ) ? Material Quantity or MQ is the list of individual quality of the material of each item of work mention in It is very essential and needed later before ordering the construction materials (i.e.- cement, sand, aggregate, brick, reinforcement steel, etc.). A sample template of Item wise Material Quantity A sample template of Summary of Material Use of Calculation of quantity of Materials In, you can separately calculate the Quantity of all construction materials (i.e. Cement, Sand, Aggregate, reinforcement, bricks, etc) from each Item Works (i.e. PCC, RCC, Single Brick Flat Soling, Plaster, Brickwork- Morter, etc.)
How to estimate the quantity of block work in a building?
(c) Quantity Estimation Guide for Blockwork – The following quantity estimation guide can be used for the estimation of the block work in a building;
10 blocks are required to lay one square metre (1m 2 ) of block wall1 bag of cement is required to lay 50 blocks (9 inches block)320 kg of sharp sand is required to lay 50 blocks (9 inches block)
