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 Ibeju Lekki, 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.


*Courtesy Castle Magazine*

*Hope you got some value from this?* �

What kind raft do u mean. Is it the one that spreads all over the building area or the one that spreads where the building columns are to be installed?

I don’t know much about foundations this is copied article from the magazine. But I know the beam and slab foundation is commonly used in IBEJU lekki

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