building construction Paper 2 WASSCE (SC), 2019

Question 4

(a)    State three functional requirements of a roof.
(b)    Use a sketch to illustrate the method of fastening a roof rafter to the ring beam.
(c)    List three materials used for the manufacture of drain pipes.

Observation

Most candidates were able to:

-    State three functional requirements of a roof.
-    List three materials used for the manufacture of drain pipes.

However, some of them failed touse a sketch to illustrate the method of fastening a roof  rafter to the ring beam.

The expected response to question 4 is as given below:

4. (a)    Functional Requirements of A Roof

-   Strength
-   Durability
-   Exclusion of wind and rain
-   Resistance to spread of fire
-   Resistance to heat
-   Stability
-   Resistance to sound penetration
-   Resistance to leakage of air
-   Security
-   Aesthetics
         
(b)  A Sketch illustrating the Method of Fastening a Roof Rafter to the wall


(c)   Materials used for Making Drain Pipes

  1. Pitch-fibre
  2. Vitrified clay
  3. Polyvinyl Chloride (P.V.C)
  4. Cast-iron
  5. Asbestos cement
  6. Concrete