Question 3
- a) State three advantages of a pitched roof over a flat roof.
b) List five major operations involved in hanging a wooden door to an existing frame in a
sandcrete blockwall.
c) Define the following in relation to wall construction:
Observation
Most candidates were able to:
However, few candidates were unable to:
- list the five major operations involved in hanging a wooden door to an existing frame in a sandcrete blockwall correctly.
- advantages of pitched roof over a flat roof:
- better thermal insulation;
- adequate ceiling space for accommodation of services facilities;
- provides better eaves overhangs to protect the external walls from weather elements;
- adequate roof drainage;
- more aesthetics;
- better sound insulation.
- Five major operations involved in hanging a wooden door to existing frame:
- trim the door to fit the opening;
- provides clearance with a wedge;
- mark and cut the position of lock/handle/knob;
- mark and cut the position of hinges;
- fix the hinges to the door and frame
- fix the lock.
- check the door for free movement.
- Definition of the terms:
- Racking back - provision for future extension in which each course of the wall is set back.
- Toothing - the recesses formed in alternate courses of a wall to facilitate future extension.
The expected response to question 3 is as given below;