Weathering Course 15 Sep 2021

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Chapter 4.6
WEATHERING COURSE
4.6.1 WEATHERING COURSE
Weathering course is a course normally laid at top surface

of the terrace so as to protect the roof slab from the weathering
effects.
Materials required
The materials commonly used for weathering course are
1) brick jelly 2) Lime 3) CA 4) FA 5) Tiles
4.6.2 BRICK JELLY CONCRETE 9- koduk k a

Preparation, laying and beating methods ka
Bricks of 15 cm x 2 cm are laid on edge in lime mortar
1:1% diagonally across the roof. The bricks are immersed
in water 24 hours before and the thickness
use of jointis
10mm.
After the bricks are completely set, a 10 cm thick layer of
Drick concrete 2%: 1 is laid over on brick course and beaten
OWn to 7.6 cm thickness by wooden hand beaters. The beating

Continued till the beater makes no impression on the concrete
and readily rebounl hy the surfare when struek upon t.
Thehe whole course
se is then eured for about a week by sprinkling
lime water.
4.57
After the conerete has set three course of Madras flat
tiles, 15 cm x 10 cm x 12 mm are laid in lime mortar 1: 1
The thickness of joints should not exceed Gmm and the vertical
joints should be broken. The joints of the top layer are left open
to afford key to the plaster.
The top surface is then plastered with three coats of lime
mortar and finally rubbed to a polished surface. The roof is
usually laid to a slope of 1 in 36.
4.6.3 DAMP PROOFING
In hot and humid regions lime concrete terracing with

flat tiles is recommended. Damp proofing is done in the following
way.
1) A covering with lime concrete with two courses of

brick tiles is laid in cement mortar.
2) D.P.C.of hot bitumen @ 1.70 kg/m2 is laid on top of

this a layer of coarse sand @ 0.6 m3 of sand per
100 m2 of roof surface isspread.
3) The lime concrete is laid at a proper slope in average
thickness of 10 cm.
4) Finally two coursns of flat tiles (each course of 13 to

20 mm thickness) is laid in cement mortar.
5) The joints of the top course of the tile are pointed

with cement mortar having mix proportion 1:3
and 5% of crude oil, based on the weight of
cement.
4.558
REVIEW QUESTIONS
PART A
(One mark)
What is the standard size
of internal doors in a building?
What is the standard size for Bathroom
doors and W.c
doors in a residential building?
9 What should preferably be the height of sill of a window

from floor level ?
4, Name some materials used for Doors and Windows.
5. Define ventilators.
6. Where is a glazed window used?
7. What is a panel in a door or window ?
8. What should be the total area of window openings with
respect to floor areas?
9 What are the two types of flush doors?
10. Where are louvered Doors and windows preferred?
11. What is the percentage of voids in hollow blocks?
12. What is a core block?
13. Where are light - weight aggregates used.
14. Define a stair.

16. What is a staircase?
17. What is a flight ?
18. What are the different types of lifts ?
19. What do you mean by Rise and 'Tread in a stair ?
20. What is a floor?

21. Define flooring.
22. What are the two types of floors?
46. What material is used as C.A. in granolithic flooring'
24. What
is PVC?
25 What is a composite floor ?
4.59
26. What is the
normal thickness of R.C.C.
27. What is a
floors ?
piteh ?
28. What is a roof?
29. Define truss.
30. What are the two types of flat roofs?
31. List out two types of roof
coverings.
32. What is D.P.C. 2
33. What are the materials used for D.P.C. ?
34. What the
are
advantages of Lifts over stairs?
35. What are the uses of lifts?
36 iet, the
advantages of North light roof.
PART B
e door and a window.
a
(Twelve marks)
2. State the
important factors to be considered while
designing a door or window.
3. Write short notes on the usage of
a) Collapsible doors b) Rolling steel shutter
Where are Dormer windows locate, illustrate?
5. What are the standard sizes of ventilators?
6. What is the purpose
of providing ventilators?
7. Explain briefly: a)
Pivot-hung Ventilator b) top-hung
Ventilator.
8. Ilustrate and explain the component parts of a door and
a window.
9. List out the different types of doors and explain any
3 type.
10. List out the different
types of windows and explain u
3 type.
11. Illustrate and explain how mosquito proofing is prov
vided
in Doors, Windows and Ventilators.
4.60
How are blocks used as load - bearing elements.
12
What are open cavity blocks? Write briefly.
13.
rite briefly about the nominal diamensions of blocks.
14.
15. 1/rite briefly about the advantages of autoclave

Write bri
cellular blocks.
What are the advantages of hollow blocks?

16.
are the
different grades of hollow blocks?
17 What
about the manufacturing ofconcrete blocks.
18 Write in detail
the physical requirements of
19. Write in detail about
concrete blocks.
autoclaved cellular blocks and

20 Write in detail about
their manufacturing.
21. Where should be the stair located in residential buildings

andpublic buildings?
different types of materials used
for stairs?
22. What a r e the
is it used ?
23. What is a n escalator and where
llustrate and explain the component parts of a stair.
24
elevator.
25. Sketch and explain an
26. Sketch and explain

c) Bifurcated stairs
a) Dog legged stairs
d) Spiral stairs.
b) Open well stairs
27. List out the types of timber floors.

28 List out the types of composite floors.
29 Write briefly about rubber flooring.
L i s t out any five materials used for tlooring
mosaic flooring.
1,Describe briefly about floors.
various types of timber
x p l a i n with sketches the
Composi
sketches the various types of
X p l a i n with
floors.
4.61
34. Describe the factors 1nvolved while selecti
ing a flonri
type.
35. Write in detail about any ur types of flooring.
35.
36. Describe briefly any five technical terms used
37. Give a neat sketch of north light truss.

38. List out the advantages of shell roofs.
39. List out the technical terms used in roofs in detail.

40. Deseribe the various types of roof coverings.
41. Write in detail about shell roofs and describe #.
various types with sketches.
42 Describe briefly damp proofing with tiles.

43. Define weathering course.
44. Discuss brick jelly concrete preparation, laying and

beating methods.
45. Explain with neat sketch the combination of windows
and ventilators.
46 Explain about the North Light Truss.

*****
4.62

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4.6.1 WEATHERING COURSE

Weathering course is a course normally laid at top surface

The materials commonly used for weathering course are

1) brick jelly 2) Lime 3) CA 4) FA 5) Tiles

4.6.2 BRICK JELLY CONCRETE 9- koduk k a

OWn to 7.6 cm thickness by wooden hand beaters. The beating

4.6.3 DAMP PROOFING

In hot and humid regions lime concrete terracing with

1) A covering with lime concrete with two courses of

2) D.P.C.of hot bitumen @ 1.70 kg/m2 is laid on top of

4) Finally two coursns of flat tiles (each course of 13 to

5) The joints of the top course of the tile are pointed

9 What should preferably be the height of sill of a window

14. Define a stair.

20. What is a floor?

15. 1/rite briefly about the advantages of autoclave

What are the advantages of hollow blocks?

autoclaved cellular blocks and

21. Where should be the stair located in residential buildings

26. Sketch and explain

27. List out the types of timber floors.

37. Give a neat sketch of north light truss.

39. List out the technical terms used in roofs in detail.

42 Describe briefly damp proofing with tiles.

44. Discuss brick jelly concrete preparation, laying and

46 Explain about the North Light Truss.

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