Windows

Definitions

Definitions

Definitions

Definitions

Window Types

Window Types

Widow Types

Window Types

Window Types

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 protectivecoat is formed to prevent further corrosion.

This differs to Iron where the coating formed byoxidisation flakes of and exposes new metal tothe 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

Solid Frames

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

View Glazing Handout

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

Wired Glass