2. CLADDING
Cladding is a layer of a building frame
structure and it mounted on the outer
surface of a structure
In the context of a framed building the
primary objectives of the cladding system
itself are:
i) Provide an enclosure to the structure
which will give the necessary protection
against the elements
ii) Exploit dry construction methods where
possible, including the use of off-site
prefabrication
iii) Impose the minimal additional dead load
onto the frame
iv) Enhance the architectural
concept/appearance of the building
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3. Strength and stability
• Strength to support its own self weight
between points of supports or fixings to the
structural frame.
• Stability against lateral wind pressures.
• Allowance for differential movements
between itself, the structural frame and
other adjacent building elements.
• To fulfil these objectives the cladding
system must meet the following
functional requirements;
• Strength and stability
• Compatibility with Integration with
vertical and horizontal frame
members/elements
• Weather resistance
• Durability
• Thermal insulation
• Fire requirements
• Sound insulation
• Aesthetic
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4. Strength and stability
• Strength to support its own self weight
between points of supports or fixings to the
structural frame.
• Stability against lateral wind pressures.
• Allowance for differential movements
between itself, the structural frame and
other adjacent building elements.
•Compatibility with Integration
with vertical and horizontal frame
memberselements, including
• Structure wind bracing arrangements.
• Ability to cater for frame movements
Weather resistance
Resistance to wind, rain and other forms of
precipitation (cladding and joints).
Durability
Durability, freedom from maintenance, and
ability to weather well.
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5. Thermal insulation
• Avoidance of problems arising from ‘cold
bridging’ and from surface and interstitial
condensation.
• Minimisation of air leakage
Fire requirements
Restriction of flame spread to internal and
external surfaces and within voids
Sound insulation
Prevention of sound originating in one part
of the building being transmitted to other
areas via cladding members/elements.
Aesthetic
• The need to respond to the context
within which the building is situated.
• The need to satisfy the aesthetic
aspirations of the client. (Weathering
characteristics/durability of materials).
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9. Key points
The primary roles
1. Control the infiltration of weather
elements.
2. Observe the egress of water vapour.
3. Durable, aesthetical , pleasing
appearances.
The secondary roles
1. Sound and thermal insulation.
2. Fire resistance.
3. Capacity of cleaning in dusty, polluted or
vandal prone environment.
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