This set of Building Construction Interview Questions and Answers for Experienced people focuses on “Roof Coverings for Pitched Roofs – 2”.
1. Number of corrugations in one big-six type A.C. sheet is _________
a) Three and a half
b) Five and a half
c) Seven and a half
d) Nine and a half
Explanation: Number of corrugations in one big-six type A.C. sheet is seven and a half. The overall depth of big six-type A.C. sheets is 55 mm. While the standard corrugated sheets have ten and a half corrugations per sheet.
2. Asbestos cement sheets are stronger than G.I. sheets.
Explanation: Galvanised iron corrugated sheets or G.I. sheets are much stronger than the asbestos cement sheets. However, nowadays they are being replaced by asbestos cement sheets because of their large costs. G.I. sheets are fixed in nearly the same fashion as that of A.C. sheets.
3. _______ is used for the galvanisation of iron sheets.
Explanation: Zinc is used for the galvanisation of iron sheets. It is done in order to prevent the rusting of iron by cutting the contact of iron with air or moisture.
4. Which of the following is the correct formula for finding gauge in slate roofing?
a) Gauge = (length of slate – lap)/2
b) Gauge = (lap – length of slate)/2
c) Gauge = (length of slate – lap)/4
d) Gauge = (lap – length of slate)/4
Explanation: In slate roofing, the slates are fixed to the battens. The spacing of these battens is known as gauge. Gauge is calculated by using the formula – Gauge = (length of slate – lap)/2.
5. Which of the following is used for both pitched as well as flat roofs?
b) Aluminium sheets
d) Asbestos cement sheets
Explanation: Decking and sheeting are the two types of lightweight roofing materials. Decking is used for both pitched as well as flat roofs. Sheeting is used for only pitched roofs.
6. Aluminium roof sheeting consists of aluminium alloyed with ________
Explanation: Aluminium roof sheeting is the lightest of all the roofing materials. It consists of aluminium alloyed with manganese. Manganese is present in a very small amount to impart strength.
7. Which type of tiles is shown in the figure below?
a) Pan tiles
b) Plain tiles
c) Spanish tiles
d) Inter-locking tiles
Explanation: The figure given above represents pan tiles. In this figure, A represents bed and B represents the nib. Pan tiles are curved while plain tiles are flat.
8. In asbestos cement sheets, the laying always begins from __________
Explanation: Asbestos cement sheets can be either laid from right to left or from left to right. In asbestos cement sheets, the laying always begins from eaves. Hence, the eaves course is laid first.
9. Aluminium alloy and steel decking is suitable up to a load of __________
a) 0.75 kN/m2
b) 1.5 kN/m2
c) 1.75 kN/m2
d) 2.5 kN/m2
Explanation: Aluminium alloy and steel decking is suitable up to a load of 0.75 kN/m2. In this, the width of corrugation varies from 450-900 mm, the depth varies from 25-85 mm and the length is up to 10 m.
10. The figure given below represents __________
a) Under tile
b) Over tile
c) A.C sheet
d) G.I. sheet
Explanation: The figure given above represents over tile. In this figure, A represents the head and B represents the tail. An over tile tapers down from the tail to head while an under-tile tapers down from the head to tail.
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