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Understanding BCA requirements for window design is crucial for building compliance. This guide covers essential aspects such as lighting, which mandates 10% glass area for habitable rooms, and ventilation requirements necessitating 5% of the floor area for natural or mechanical ventilation. It also details materials used in windows, including aluminum finishes and types of glass like toughened, laminated, and wired glass, along with their safety criteria. Adhering to these guidelines ensures safety and functionality in modern building designs.
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BCA Requirements • Lighting – Habitable Rooms 10% of room floor area. Must be clear lighting i.e. glass area • Not be closer than 900mm to provide unrestricted lighting
BCA Requirements • Ventilation • All habitable rooms require ventilation • Bathrooms, Laundries also require ventilation • Any other room that be occupied by a person will require ventilation. • Ventilation must be 5% of floor area • If natural ventilation is not possible , mecanical ventilation can be used • Ventilation may be drawn from an adjoining room so long as it not a toilet or airlock
BCA Requirements • Note – Toilet cannot open directly onto a food preparation area without an airlock
Materials • Aluminium
Finishes Naturally when Aluminium oxidises a protective coat is formed to prevent further corrosion. This differs to Iron where the coating formed by oxidisation flakes of and exposes new metal to the elements
Finishes • Anodising • Is the process where this oxidisation process is accelerated and enhanced to build up the thickness off the oxidised layer • Electrolysis in an acid bath is used and dyes are added to provide colouring
Finishes • Powder Coating • Paint is applied dry by use of electrical charges ie paint is a negative charge and the window is positively charged. • The item is then cured by baking to form a hardened skin
Materials • Timber • May be rebated solid sections or hollow box sections • Durable timbers must be used
Float Glass • Floating molten glass is laid out on molten tin • The molten glass then achieves its desired thickness as it settles under its own weight • A uniform thickness is then achieved
Drawn Sheet Glass • Molten Glass is drawn thru annealing rollers to achieve its size • Some variance will result, giving the appearance of distortion.
Safety Glasses • Float and Drawn glass when broken will leave sharp and jaggered edges which are very dangerous • The BCA limits where can float or drawn glasss
Doors • 3mm & 4mm Float & Drawn glass maximum area 0.1m2 • Maximum width 125mm • Float & Drawn glass not allowed in wet areas
Door Side Panels • 3mm Float & Drawn glass above 1.2 above floor • Below 1.2 above floor no matter thickness max area allowable 0.5m2
Safety Glass Types • Toughened Glass • Laminated Glass • Wired Glass
Toughened Glass • Float Glass is cut to required size • Placed in furnace to just above melting point but not flowing (Gel like) • It is then rapidly cooled causing stressing on the surface particularly on edges • Becomes stronger (4 to 6 times) • Hard impact will cause the glass to shatter into sizes of about the size of 5 cent pieces
Laminated Glass • Two layers of glass held together by a transparent membrane between the glass • When broken the membranes holds the glass sheets together. • Membrane will hold together and hard impact will cause holes
