waecE-LEARNING
Building Construction Paper 2,Nov/Dec. 2010  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength




Question 2

  1. The figure below shows the substructural works of a domestic building in a waterlogged soil. The strip foundation is to be laid at a depth of 1,000 mm from the ground level


    (a)With the aid of annotated sketch(es), illustrate how moisture from the subsoil is prevented from rising to the ground floor slab.
    (b)State two factors that influence the choice of the width of a foundation for a load bearing well.
    (c)Show with a labelled sketch, each of the following types of foundation:
    (i)wide strip;
    (ii)raft.

                             
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OBSERVATION

 Most candidates were able to:
illustrate how moisture from the subsoil is prevented from rising to the ground floor slab;
state the factors that influence the choice of the width of a foundation for a load bearing wall;
draw the given types of foundation.
However, few of them were unable to:
illustrate how moisture from the subsoil is prevented from rising to the ground floor slab.
The expected response to question 2 is as given below:
(a)Method of preventing subsoil moisture from rising to the ground floor slab

Factors that influence the choice of the width of a foundation for a load bearing wall are:
(i)Bearing capacity of the subsoil.
(ii)Load to be borne by the foundation.
(iii)Thickness of the wall to which it provides support.
(c) (i)_Sketch of wide strip foundation



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