If you are building on a water logged plot,
your foundation is likely to be a ‘raft’ foundation which shoots out of the
ground instead of the strip foundation where the contractor digs into the
earth.
In addition, to ensure that the site is
well drained, the raft should be well above the road level and this means that
the compound has to be filled with sand.
There are two types of materials used to
fill the site: laterite earth filling (a reddish ‘sand’) which is usually
transported from the Shagamu axis and sharp sand filling (a finer white sand)
which is pumped from the lagoon bed.
The laterite earth filling costs an average
of N15,000 per 10 ton tipper while the sharp sand filling costs an average of
N45,000 per 20 ton tipper. The amount of sand required for sand-filling varies
from site to site and is dependent on factors like size of the plot, height of
the raft etc.
For the Island and spanning through
IbejuLekki, it is most advisable to go for sharp sand for ease of work during
construction and for a lasting structure but if cost is of concern using
laterite will require adequate compaction preferably using of machine
compactor.
Typically for a private detached house on
plot of about 600sqm, an average of 5 nos 20 tons tipper loads is about the
quantity required.
As usual, our Layman Builder readers are
advised to consult a quantity surveyor for the right measurements.
Courtesy Castle Magazine.Additional
footnote from Engr. Isaac Adeyemi.
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