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| Cement, Sand calculation in plaster |
Length of wall = 6 m
Breadth of wall = 3 m
Theckness of plaster = 0.012 m (12mm)
Volume of Plaster-
Volume of Plaster= L x B x H
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Requirment of Cement-
Density of Cement = 1440 Kg/m3
=1440 x 0.041 = 59.04 kg
(1 Bag cement = 50 kg)
then = 50/59.04 = 1.18 Bag
Requirment of Sand -
● 6 mm thick cement plaster for ceiling and concrete plaster
●12 mm thick cement plaster is used for plastering internal walls and leveling brick walls.
● 15mm or 20mm teak cement plaster for plastering external walls and rough surface of brick walls.
2) Mixing Ratio of Cement Plaster: There are several mixing ratios for brick masonry plaster, the ratio of cement and sand for plaster depends on the type of work and the type of plaster, whether it is rough or flat.
Ratio-For flat and rough plastering of brick
walls, concrete walls and ceilings, a ratio of cement to sand mixture of 1:3,
1:4, 1:5 and 1:6 is recommended.
● 1:3 cement/sand mixing ratio for external plastering and repairs in harsh climates
● 1:4 cement to sand ratio for exterior wall plastering and ceiling plastering
● If fine sand is not available, cement and sand ratio of 1:5 should be used for plastering the internal walls.
● If there is fine sand, the ratio of cement and sand should be
1:6 in the case of internal wall plastering.
1) Calculations for
plastering external brick walls (in square feet): - For calculation example I
will assume 20mm thick plaster and mix ratio of 1:4 for external brick
plastering
● Step 1. We know that
10,763 square feet = 1 square meter
So 100 square meters =
9.29 square meters
● Step 2: Volume of
exterior plaster = Area X Thickness = 9.29 X 0.020 = 0.1858 cubic meters
Because the wet volume
is always less than the dry volume. To convert the wet volume of the mortar to
the dry volume, we multiply the wet volume by 1.33. Required dry volume of
mortar for external rendering = 1.33 X dry volume of plaster = 1.33 X 0.1858 =
0.2471 cu.m.
● Step 3: The mortar
mixing ratio is 1:4, so the total ratio = 1 4 = 5 One part cement and four
parts sand
Cement required = 1/5
X 0.2471 = 0.0494 cubic meters (cubic meters)
Required sand = 4/5 X
0.2471 = 0.198 cu.m
● Step 4: Get the
weight of the required material multiplied by its density
Required cement =
0.0494 cu.m x 1440 kg/cu.m = 71 kg
Bag of cement = 71/50
= 1.42
Since sand is usually
measured in units of cft = 0.198 X 35.4147 = 7 cft
1.42 (71 kg) bags of
cement and 7 cubic feet of sand are required for exterior plastering of 100
square feet of brick.
internal brick wall plaster calculations ( in square feet)
2) Internal
brick wall plaster calculation is expressed in square feet: - For
example calculation I will take 12mm thick plaster and mix ratio 1:5 for internal brick wall plaster.
● Step 1. We know that 10,763 square
feet = 1 square meter
So 100 square meters = 9.29 square meters
● Step 2: Internal wall plaster volume = area X thickness = 9.29 X 0.012 = 0.112 cubic
meters
Because the wet volume is always less than the dry
volume. To convert the wet volume of the mortar to the dry volume, we multiply
the wet volume by 1.33. Dry volume of mortar required for interior brick plaster = 1.33 X dry volume of plaster = 1.33 X 0.112 = 0.149 cu.m.
● Step 3: Mortar mixing ratio is 1:5 so total ratio = 1 5 = 6 of which 1 part cement and 5 parts sand
Cement required = 1/6 X 0.149 = 0.0248 cubic meters
(cubic meters)
Sand required = 5/6 X 0.149 = 0.124 cum
● Step 4: Get the weight of the required material
multiplied by its density
Required cement = 0.0248 cu.m x 1440 kg/cu.m = 36 kg
Bag of cement = 36/50 = 0.72
Since sand usually measures cft = 0.124 x 35.4147 = 4.37 cft
0.72 (36 kg) bags of cement and 4.37 cubic
feet of sand are required for 100 square
feet of indoor brick plastering.
Plaster calculations for ceilingsin (square feet)
3) Plaster
calculations for ceilings and concrete in square feet: - For the calculation of the
example, I will assume a 6 mm thick plaster and a mixture ratio of 1:4 for ceiling and
concrete plastering
● Step 1. We know that 10,763 square
feet = 1 square meter
So 100 square meters = 9.29 square meters
● Step 2: Volume of ceiling and concrete plaster = Area X Thickness = 9.29 X
0.006 = 0.0558 cubic meters
Because the wet volume is always less than the dry volume. To convert the wet volume of the mortar to the dry volume, we multiply the wet volume by 1.33. Dry volume of mortar required for ceiling and concrete plastering = 1.33 X dry volume of plaster = 1.33 X 0.0558 = 0.0742 cubic meters.
● Step
3: The mortar mix ratio is 1:4 so total ratio = 1 4 = 5 where 1 part is cement
and 4 parts is sand
Cement
required = 1/5 X 0.0742 = 0.01484 cubic meters (cubic meters)
Required
sand = 4/5 X 0.0742 = 0.060 cu.m
● Step
4: Get the weight of the required material multiplied by its density
Required
cement = 0.01484 cu.m x 1440 kg/cu.m = 22 kg
Bag of
cement = 22/50 = 0.44
Since
sand is usually measured in units of cft = 0.060 X 35.4147 = 2.12 cft
100 square feet of ceiling and concrete plaster requires 0.44 (22 kg) bags of cement and 2.12 cubic feet of sand.
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