The Functional Requirement Of Cladding System – Essay

Strength and Stability

A wall structure should have adequate strength to support its own weight between points of support or fixing to the structural frame, and sufficient stability against lateral wind pressures. To allow for differential movements, there has to be adequate support to carry the weight of the wall structure, and also restraint fixings that will maintain the wall in position and at the same time allow differential movements without damage to either the fixings or the wall material. Thin sheet wall materials such as GRP, metal and glass suffer rapid changes in temperature and consequent expansion and contraction which may cause distortion and damage to fixings or the thin panel material or both.

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In the design of wall structure faced with thin panel or sheet material, the ideal arrangement is to provide only one rigid support fining to each panel or sheet with one other flexible support fixing and two flexible restraint fixings. The need to provide support and restraint fixings with adequate flexibility to allow for thermal movement and at the same time adequately restrain the facing in place and maintain a weather tight joint has been the principal difficulty in the use of thin panel and sheet facings.

Resistance to weather/exclusion of wind and rain

The least thickness of solid wall material necessary to prevent penetration of rainwater to the inner face depends on the degree of exposure to driving rain. Common practice is to construct a cavity wall adequate thermal resistance to the passage of heat, and an attractive finish. Common practice is to construct solid cladding systems with an outer leaf of light weight block for insulation.

Material used to seal joints is required to be resilient enough to accommodate movement and resist weather deterioration. The ‘rain screen’ principle is designed to provide a separate outer skin, to screen wall panels from scouring by wind and rain and deterioration by sunlight, and to improve the life and efficient of the joint seals.

Durability and freedom from maintenance

The durability of a wall structure is a measure of the frequency and extent of the work necessary to maintain minimum functional requirements and acceptable appearance. For example, masonry required a little maintenance because the dirt stained due to slow run-off of water from open horizontal joints. Panels of glass will maintain their finish over the expected life of buildings but will require frequent cleaning of the surface if they are to maintain their initial appearance, and periodic attention to and renewal of the seals. Another material that can be used is metal. bronze and stainless steel, both materials, will weather by the formation of a thin film of oxide that is impermeable and prevents further oxidation.

Fire safety/fire Resistance

Primary precautions are the internal spread of fire across the surface materials of the wall and ceilings, external fire spread over the fabric and fire spread such as cavities. The Building Regulations prohibit the use of materials that encourage spread of flame across their surface when subject to intense radiant heat and those which give off heat when burning. Limits of using thermoplastic materials in roof lights and lighting diffusers set in Building Regulation.

To limit the spread of fire between buildings, limits to the size of ‘unprotected areas’ of walls. The term ‘unprotected area’ is used to include those parts of external walls that may contribute to the spread of the fire between buildings such as windows. The Regulations also limit the use of materials of roof coverings near a boundary that will not provide adequate protection against the spread of fire over their surfaces.

Resistance to the passage of heat/thermal property

Addition insulation need to be provided by lining of the cladding material. The interiors of building clad with large areas of glass may gain through large part or the whole of their internal heat from a combination of solar heat gain through glass cladding and from internal artificial lighting. Solar heat gain can be controlled through the use of simple shading devices fixed externally or internally to the building fabric.

Control of internal temperatures

As we know, solar is gain through glass panel. The thermal control can be achieved by deep recessed window used in conjunction with external vertical fins, non-transparent external louvers and used of special solar control glass. Another way is minimized the air leakage in the building. We need to maintain the temperature in the building like the concept of green house effect that can traps the heat in the building in the cool day.

Resistance to the passage of sound/sound insulation

There are several ways to overcome this problem. Firstly, used the resilient pad to prevent sound originating within the structure to be transferred vertically through cladding members. Airbone soung can be prevented by utilizing double glazing panel to window area.

B) A client requires a road that requires little maintenance with reasonable non-skid properties. With the aid of diagramme, suggest a type of road and the construction methodology for the proposed used.

A client requires a road that requires little maintenance with reasonable non-skid properties. With the aid of diagramme, suggest a type of road and the construction methodology for the proposed used.

Type of Road: Flexible Road

Sub-grade: original soil or backfilling soil