T270(E)(N14)T
NOVEMBER 2012
NATIONAL CERTIFICATE
CARPENTRY AND ROOFING THEORY N2
(11022192)
14 November (X-Paper)
09:00 – 12:00
This question paper consists of 5 pages, 2 diagram sheets and a 1-page annexure.
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T270(E)(N14)T
DEPARTMENT OF HIGHER EDUCATION AND TRAINING
REPUBLIC OF SOUTH AFRICA
NATIONAL CERTIFICATE
CARPENTRY AND ROOFING THEORY N2
TIME: 3 HOURS
MARKS: 100
________________________________________________________________________
NOTE:
If you answer more than the required number of questions, only the
required number of questions will be marked. All work you do not want to
be marked, must be clearly crossed out.
INSTRUCTIONS AND INFORMATION
1.
This question paper must be answered as follows:
1.1
ALL the candidates must answer QUESTION 1 to 6.
1.2
CARPENTRY CANDIDATES must answer QUESTION 7 only.
1.3
ROOFING CANDIDATES must answer QUESTION 8 only.
2.
Read ALL the questions carefully.
3.
Number the answers correctly according to the numbering system used in this
question paper.
4.
Keep subsections of questions together.
5.
Sketches must be neat and clear and done in PENCIL.
6.
ALL drawings must be labelled.
7.
RULE OFF across the page on completion of each subsection.
8.
Start each question on a NEW page.
9.
Write neatly and legibly.
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T270(E)(N14)T
QUESTION 1
1.1
Complete the following paragraph by filling in the words provided in the list
below. Write only the word(s) next to the question number (1.1.1 – 1.1.6) in
the ANSWER BOOK.
foundation; 1 metre; vertical pegs; walls; temporary structures; descriptive
notes; horizontal members
Builder’s profiles are 1.1.1 … erected around a structure to be erected. They
consist of 1.1.2 … driven into the ground with 1.1.3 … fixed to a certain
distance from the ground. On the horizontal members, positions are marked
out of the different sections for example, the width of the 1.1.4 … and the
1.1.5 … . These structures are usually 1.1.6 … away from the excavations
so that they do not interfere with the building operations.
1.2
Briefly explain the term benchmark.
(6)
(4)
[10]
QUESTION 2
2.1
Illustrate, by means of geometrical construction, how to determine the edge
bevel and the side bevel of a purlin.
(10)
2.2
Explain TWO methods of securing purlins to rafters.
(2)
2.3
Briefly explain how trusses are permanently fixed to the wall structure.
(3)
2.4
ANNEXURE 1 (attached) is an extract from the National Building Regulations.
Study ANNEXURE 1, TABLE 1 and then answer the following questions:
A pitched roof with a pitch of 22,5º is needed. The maximum span of the roof
is 10,00 m and the roof is covered with metal sheets.
Determine each of the following:
2.4.1
The size and grade of the timber for the rafter
(2)
2.4.2
The size and grade of the timber for the tie beam
(2)
2.4.3
The maximum spaces for the roof trusses
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T270(E)(N14)T
QUESTION 3
3.1
3.2
The National Building Regulations specifies THREE classes/categories of roof
coverings.
3.1.1
State the THREE classes.
(3)
3.1.2
Give ONE example of each class.
(3)
Make a neat, detailed drawing to show the ridge of a roof covered with
corrugated fibre cement sheets.
(9)
[15]
QUESTION 4
COLUMN B below outlines the procedure to install a gypsum board ceiling. The
sequence/steps are not in order. Rearrange the sequence into its correct sequence.
Write only the letter (A – H) next to the question number (4.1 – 4.8) in the ANSWER
BOOK.
PROCEDURE
4.1
COLUMN B
A fit a double row of battens
4.2
B fit and fix the cornice
4.3
C fit and fix the ceiling boards
4.4
D fix the cover strips
4.5
E create a datum mark
4.6
F mark the batten spacing on the wall
4.7
G fixing the brandering
4.8
H level the brandering
[8]
QUESTION 5
Distinguish, with the aid of pictorial/isometric drawings, between the following dormers
with:
5.1
A pitched roof
(5)
5.2
A flat roof
(5)
5.3
A segmental roof
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T270(E)(N14)T
QUESTION 6
Make a neat and detailed, longitudinal drawing of a typical roof light built into a pitched
roof which is finished off with fibre cement roof tiles. Clearly indicate the roof light has
to hinge at the top.
[12]
QUESTION 7
NOTE: THIS QUESTION IS FOR CARPENTRY CANDIDATES ONLY
7.1
7.2
7.3
Draw neat, horizontal sectional drawings to distinguish between the following:
7.1.1
The internal corner of a room panelled with block board
(3)
7.1.2
The external corner of a room panelled with block board
(3)
DIAGRAM SHEET 1 (attached), FIGURE 1, shows a raking shore. Label the
parts as numbered by writing the answers next to the question number
(7.2.1 – 7.2.12) in the ANSWER BOOK.
(12)
Explain the term formwork.
(2)
[20]
QUESTION 8
NOTE: THIS QUESTION IS FOR ROOFING CANDIDATES ONLY
8.1
8.2
Illustrate, with the aid of a neat drawing, what is meant by stepped flashing.
Draw TWO steps only.
(4)
Draw neat, cross-sectional views of the following gutters to show the profiles
clearly. Indicate clearly on the drawing the fixing methods of the gutters:
8.2.1
Half-round PVC gutter
(3)
8.2.2
Square box gutter of fibre cement
(3)
8.2.3
Traditional galvanized steel gutter
(3)
8.3
State THREE advantages of a self-adhesive waterproofing membrane.
8.4
DIAGRAM SHEET 2 (attached), FIGURE 2, shows FOUR tools used by a
roofer. Name these tools by writing the answers next to the question number
(8.4.1 – 8.4.4) in the ANSWER BOOK.
TOTAL:
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(3)
(4)
[20]
100
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ANNEXURE 1
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DIAGRAM SHEET 1
QUESTION 7.2
FIGURE 1
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DIAGRAM SHEET 2
QUESTION 8.4
FIGURE 2
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