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Brick Foundation in Cement Mortar 1:8
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System Components
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Initial Cost Structure
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DESIGN EXAMPLE : Foundation for a TWO storey Building
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Maximum width required = 2 x width of the wall +0. 3m
(Assuming 23cm thick brick wall) = 2 x 0.23 + 0.3 m.
= 0.76m.
Minimum Depth Required =
Assuming P
Safe permissible pressure on base) = 175 KN/sqm
W (weight of soil) = 18 KN/sqm
Angle of repose of the soil = 30 = 175/18x0.111 = 1 m.
Assuming bearing capacity of soil = 200 Km/sqm
Width required = 175/200 = 0.85m
Thus provide a foundation width = 85cm and depth 100 cm
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Critical Factors
1. Curing
2. Width and stepping of foundation
3. Breaking of vertical joints
4. Quality of sand for mortar
5. Availability and cost of bricks
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Tools Used
1. Trowels
2. Plumb bob
3. Thread
4. Pans
5. Shovel
6. Pick axes
7. Baskets
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DO’S
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DON’T’S
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· Curing of masonry should be done on seven days
· Vertical masonry joints should be properly broken
· Masonry should be stepped after one day’s construction
· Mortar should be used within 30 minutes of adding water to the mix.
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· Fine sand should not be used in mortar
· Height of masonry construction should not be more than 1m per day
· Masonry should not be allowed to dry out quickly
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References : IS : 1080 – 1980 Simple Strip Foundation; IS : 1904 – 1973 Shallow Foundations; IS : 1077 : 1986 Bricks; IS : 2212 : 1962 Brick Work; National Building Code of India : 1983 Part VI : Sector 2; IS 2250 : 1981 Mortars .
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