GREEN ROOFS
- Total Waterproofing Company
Company Profile
• Total waterproofing Company is as the name suggests involved
mainly in the business of waterproofing
• Roofs, walls (South west), expansion joints, bathrooms, water
tanks.
• Basements and under ground tunnel.
• Some of our esteemed clients are as follows.
• Kamat builders Pnajim.
• Universal Beverages.
• Usha Ispat Ltd.
• MPT, Marmagoa
• ITC Ltd. Calcutta.
REASONS FOR CHANGE
• We in Goa and along the West coast of India live in a hot, humid tropical
climate where the rainfall is heavy. The houses should be built to keep the
interior of the building as cool as possible, reduce humidity and remain dry
in the monsoon.
• Heavy rain during the monsoons raises the humidity which encourages the
growth of moss on the roof which making it look black and ugly.
REASONS FOR PROBLEMS
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HEATING
During the day the heat from the sun heats the top most floor of the
building. The floors below get hot to a lesser extent.
Lower floors receive most of the heat from the walls. The heat coming from
the walls depends on the height of the walls and the number of floors in
the building. Greater the height of the walls and larger number of floors
more heat accumulates inside the building.
Humidity can accumulate if the ventilation is poor, especially if hot air is
unable to escape from inside the building.
LEAKAGE
Leakages occur in RCC roofs due to cyclical expansion and contraction in
the slab from cracks, construction & expansion joints.
Honey combing within the slab and also due to poor leveling of the top
finished surfaces contributes to leakages.
If inclination of the RCC sloping slabs is less than 25 degrees the possibility
of leakage is more. Less inclination restricts the height of the roof from the
inside reducing the air space above, contributes to heating also It is liable
to leak unless waterproof tiles are fitted on the top. Also since the slopes
are less on the western side rain is likely to blow in the joints between the
tiles in heavy wind and rain making the slab wet.
EXISTING SYSTEMS OF ROOFING
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RCC
• Titled Roofs
• Sheet Metal
RCC Roofs
PROS
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Very safe (thieves )& secure from most elements of the weather.
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Lasting.
• CONS
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RCC roofs are costly
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RCC roofs absorb heat during the day and can retain them for long
periods of time making the house really hot and uncomfortable to live in.
Retains humidity unless extremely good ventilation is provided.
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Leakage from rain water is very difficult to handle and can recur even if
waterproofed.
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Construction takes a long time and in case the existing structure requires
extension, it becomes very messy and the joint is liable to leak.
Titled Roofs
PROS
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Tiled roofs if made high and steep are cool.
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Cheaper to make. Quicker to lay and complete.
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Cool and comfortable to live in if the roof is steep and very high.
CONS
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Tiled roofs allow water to wet the rafters which reduce their life span and
need constant maintenance.
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Tiled roofs also tend to leak very badly if tiles are broken or get shifted.
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Unless tiles are moss proofed they become black and look ugly.
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Not secure from thief's.
Sheet Metal
PROS
• Quick to assemble.
• Can handle rain water very well if made steep.
• Secure from thief's
CONS
• Sheet metal roofs have a limited life span (rusting particularly with
bird droppings). Nor suitable close to the Sea.
• Aesthetics are poor particularly after five years.
• can leak from joints if the slope is less.
• Very noisy and disturbing in the monsoon.
• Expensive to build.
• Could be blown off in a storm.
• Very hot and humid.
Solution
GREEN ROOFS
• How do we address these problems?
• We at TOTAL WATERPROOFING have conceptualized GREEN
ROOFS which largely eliminates most of the above mentioned
defects.
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Also it has other advantages over most types of roofs.
PROCESS
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These roofs are made of composite treated small steel trusses, board and
Mangalore tiles.
Steel is painted with primer and painted over with oil paint to protect it
from rusting.
The boards are screwed down with galvanized screws.
On the outside treated Mangalore waterproof tiles are fitted to12 mm
boards. The joints of the board are sealed with flexible sealant. These
provide the first two waterproof barriers.
Tiles are treated in three stages making it waterproof, moss-proof and
retain their natural color or painted.
Inside of the truss a 6 mm board is nut bolted, its joints sealed and
drainage to exterior is provided. This ensures a third waterproof barrier.
Very good ventilation is provided. Hot air starts flowing from the base
and is let off from openings at the top most point.
The roof is made steep to increase the air space inside, and allow for
faster drainage of rain water reducing the possibility of leakages.
SS netting fitted at the openings to prevents rodents and birds from
entering the hollow space inside the roof.
Roof ends cover the wall to give protection to the wall from rain and sun.
BENEFITS OF GREEN ROOFS
• COOL
Sloping roofs made 30degrees or more, this provides more space
to trap hot and moist air, more volume of air increases insulation.
Also the large space at the top above the bracing increases the
flow of air through the entire structure. Hot air can enter at the
base, rise and exit from the apex continuously keeping the
structure cool this also reduces humidity. The draught of air
increases with the height of the roof. The Insulation of the roof is
very high due to double walled with 5” air gap also the air draft
extracts heat from the inside.. These roofs end well over the walls
reducing the amount of direct sun and rain striking the walls.
• GOOD ESTHETICS
Steep sloping roofs are more visible. These roofs can be made
very steep.
Covered with terracotta (or colored) moss proof tiles enhances
the esthetics of the building.
• COST EFFECTIVE
The total cost is less than RCC sloping slabs if the cost of
waterproofing from outside, internal plastering of the ceiling and
covering with tiles or painting is included. Environment friendly as
Less cement & steel is consumed.
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LESS CONSTRUCTION TIME & COMPELETELY WATERPROOF
Making these types of roofs is much faster than normal RCC roofs.
The inside has a finished surface and can be painted directly
High degree of waterproofing is achieved as three separate
waterproof layers with separate drainage ensure no water enters
even if tiles break or misplaced. Joints between the boards are
sealed with flexible sealant.
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EASY AMMETIES
Concealed lighting and sound system can be easily fitted and
supply pipes accommodated in the air gap.
CONTACT DETAILS
Total Waterproofing Company.
434, Fatorda Goa 403 603.
Ph: 0832 2741187. Mo. 9881095008.
F.T. da Costa.
E-mail: totalwaterproofingcoltd@gmail.com
Web site: www.totalwaterproofing.com