This is for all graduated civil Engineers who wants know about this content of roof coverings briefly Thanking you.............

1. By
K NAGA RAJU
PMC ENGINEER

2. 1. They should not absorb moisture more than
20 per cent by weight.
2. They should give pleasing look.
3. They should be capable of taking load of a
man safely, after they are supported on
reapers.
4. They should be durable.
5. They should be uniform in shape and size.

3. • Type of building
• Type of framework
• Initial cost
• Maintenance requirements
• Fabrication facilities
• Appearance and special features of locality
• Availability of material
• Climate of locality

4. • SLATE ROOFING TILES
• ALLHABAD TILES
• BURNT CLAY TILES
• CONCRETE TILES

5. SLATES
ROOFING

6. • Extremely low water absorption index,
less than 0.4%, which makes its resistant
to frost damage.
• Consists of bituminous slates called
eternit (generic term for fiber cement).
• Available in three colours-grey,black and
red.
• SIZE- 12’’x6’’, 6mm thickness
• COST- 25-30/Sq.ft

7. Each slab is divided into thin laminate
or slate by using splitters
Reduced to slabs after dividing into
sections using diamond or circular saw.
Slates are obtained from quarries as
blocks

8.  Slates roofs tiles are usually
fixed either with nails or
with hooks.
 Fixing is typically with
double nails onto timber
battens or nailed direclty
onto timbersarking boards.
nails are made up of alloy
and stainless steel.
6/16/2015

9. ALLAHABAD
TILES

10. • Allahabad tiles are generally laid side by side and the joints are
covered with half round tiles.
• It consists of flat broad bottom under tile that alternate with
convex curved over tile.
• Unfertile is flat,tapered,with flanges at the side.
• The over tile is half round and tapered in plan with diameter
tapering from 16 cm at tail to 12 cm at the head.
• The taper in the over tile allow the tile in next course to fit in.
• Vertical battens of size 2.2cmx7.5cm are fixed between sides
of adjacent under tiles and to these half round over tiles.
• Over tiles are fixed to vertical battens with 75 mm nails.
• Cost- 55-145 Sq. t

11. BURNT CLAY TILES

12.  Clay roofing tile is a good choice for homes with a
southwestern, Italian, or Spanish Mission design, or
even for homes with a modern, clean look.
 Tile lasts a long time
 Burnt clay tile roofs are only used for sloping roofs
between about 20° and 50° inclination of rafter.
 Clay tiles are heavy, requiring a strong substructure
and closely spaced battens.
 SIZES- 2’’x6’’
3’’x 8’’(Max)
 COST-45-65/ sq.ft

13. ADVANTAGE
 Tile won't rot or burn, and it
can't be harmed by insects.
 The color of a clay tile is not
affected by exposure to the
elements, it can easily last for
100of years.
DISADVANTAGE
 A major problem of clay tiles is the
immense loss due to cracking and
breakage.
 Clay tile production is a traditional
village craft in many regions, but
uniform shapes and qualities are
difficult to achieve.

14.  Special properties- Durable, waterproof
cladding for sloped roofs
 Economical aspects -Low to medium costs
 Resistance to earthquake- Low
 Resistance to rain- Very good
 Resistance to insects -Very good
 Climatic suitability- All climates, but most
common in humid areas

15. CONCRETE
TILES

16.  Plain tiles, pan tiles, Roman
tiles, interlocking tiles, and
ridge, hip and valley tiles are
made of this material.
 The mixture is composed of
normal Portland cement and
clean well-graded sand.
 The body treated with mineral
granules which have been
coated with color.
pantiles
ridge
Roman tiles

17.  Durability estimates range from 30 to 50
years.
 Weigh between 9 1/2 and 12 pounds(1
pound =.45 gram) per square foot.
 Size is 265mm by 165 mm and 12mm thick.
 Require low maintenance
 Offer good fire protection and are
resistant to rot and insects.
COST- INR 150 to INR 300/ Sq.ft

19. The usual lap for plain tiling is 65mm, for pitched roof at 37
degree.
For pitches up to 60 degree the tiles should be twice nailed
in every third course to once nailed in each course.
For pitches exceeding 60 degree all tiles should be nailed
twice.
The nails are usually 38 mm long and may be either
galvanized wrought iron, zinc, copper or composition.

20.  THANK U