building construction Paper 2 WASSCE (SC), 2021

Question 1

 

(a)        State three ways by which excavated spoils are disposed off on a building site:
(b)        (i) Use figure 1 to explain how the right-angled corner at B can be established using 3:4:5 method.
            (ii)        Sketch the isometric view of a corner profile.

(c)       State the specific use of the respirator on a construction site

Observation

 

(a)        Ways by which excavated spoils are disposed off on a building site are:
- used for trench backfilling;
- stored in spoil heaps at pre-defined areas on site for future use;
- removed from site to other destination for later use;
- spread out for landscaping/gardening.

(b)        (i)         How the right-angled corner at Bean be established:

  • Establish peg A and measure the given distance to establish B using 3 units
  • Measure line BC in 4 units to the required distance
  • Measure line CA in 5 units
  • Check lines AB and BC using builder’s square to obtain 90 degrees corner.