1920 or prior Villa

Villa

Durable materials used

Mainly use native timber which is naturally durable regardless of moisture presence.

More simplified envelope

Mainly use native timber which is naturaly durable.

Starting to use exotic timber which is less durable than native

More roof to wall junctions showing which are volnarable to water ingress.

Further simplified envelope almost without any high weathertightness features.

Use combination of native and exotic timber as structure materials.

Universal shape to meet high volume and low price post WW2 housing demand

Relatively more variaties of different envelopes availabe comparing with state houses.

Pine started to use as main structure timber. Mainly CCA treated and wet delivered.

Simple house shape with very few weathertightness high risk features.

Even more simplified envelope with no high risk weathertightness features.

Aluminium joinery started to emerge.

Hardie plank combined with aluminium joinery were dominating

Variety of different cladding materials

More complicated houses started to build

First leaky house with treated timber started

Computerised Automated Design (CAD) + Monolithic cladding + Untreated timber + Low skilled labour + Height relation to boundary = Leaky house