Transcript copper and aluminium - BALLARAT BUILDING DESIGN

VPAU592 Construction
Materials For Building Projects
Copper and Aluminium
COPPER
Architecture / Industry
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Copper has been used as a waterproof
roofing material since ancient times,
giving many old buildings their
greenish roofs and domes. Initially
copper oxide forms, replaced by
cuprous and cupric sulfide, and finally
by copper carbonate. The final
carbonate patina (termed verdigris) is
highly resistant to corrosion.
COPPER
Architecture / Industry
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The statue of Liberty contains 81.3
tonnes of copper.
Copper alloyed with nickel
(Cupronickel and Monel) is used as
corrosive resistant materials in
shipbuilding.
Copper compounds in liquid form are
used as a wood preservative,
particularly in treating original portion
of structures during restoration of
damaged due to dry rot.
COPPER
Architecture / Industry
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Copper nails were used in
making oast cowls
Copper wires may be
placed over non-conductive
roofing materials to
discourage the growth of
moss (Zinc may also be
used for this purpose).
COPPER
Household Products
Copper is still commonly used for
household products. These include:
• Copper plumbing fittings and
compression tubes.
• Door knobs and other fixtures in
houses.
• Roofing, guttering and rainspouts on
buildings.
• Copper water heating cylinders.
COPPER
Durability
Sheet materials like stainless steel,
copper, zinc, aluminium and lead
are inherently durable. The
oxidisation of the base material
forms a protective patina.
Usually used for flashing or very small
sections like covered entry ways,
copper is expensive.
COPPER
Recyclable
Copper is used for
regenerative principles
of sustainable design.
If a building were to
ever by dismantled,
the copper would be
reused because of its
high value and variety
of possible uses
COPPER
The Future
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While copper is much sought after
for heritage projects and feature
roofs on expensive homes, it is
slowly making it'd way into the
average residential sector.
Many companies are now selling
interlocking shingle type copper
products.
Roofing companies that do
standing seam roof in other
metals also offer copper as an
option,
COPPER
Advantages
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Copper is durable. A well designed and fixed copper roof will
easily last the lifetime of it's owners or their children.
It fire resistant.
At the correct roof slope it will shed snow very easily.
It is lightweight and so does not impose dead loads on the
roof framing.
There is no limit the angle of pitch of a copper roof.
COPPER
Disadvantages
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Installing copper roofing is not a job for an amateur. It has to
be done correctly. You cannot cut costs by doing it yourself.
Copper is more expensive than most other roofing materials.
A skilled professional copper roofer will know how to install
your roof taking into consideration galvanic corrosion, but as
for all metal roofs the owner should make sure that other
people working on the roof at a later date, know the correct
methods.
ALUMINIUM
Brief
Aluminium is a soft, durable,
lightweight, malleable metal with
appearance ranging from a silvery
to dull grey, depending on the
surface roughness.
Aluminium is non-magnetic and nonsparking. It is also insoluble in
alcohol, though it can be soluble in
water in certain forms.
ALUMINIUM
Brief Continued…
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It is mostly used as a non-ferrous metal.
Global production of aluminium in 2005 was 31.9 million
tonnes. It exceeded that of any other metal except iron
(837.5 million tonnes).
ALUMINIUM
Pure Aluminium
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Relatively pure aluminium is
encountered only when corrosion
resistance and/or workability is
more important than strength or
hardness.
A thin layer of aluminium can be
deposited onto a flat surface to
form optical coatings and mirrors.
ALUMINIUM
Pure Aluminium Cont…
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Pure aluminium has a low tensile strength, but when
combined with thermo-mechanical processing, aluminium
alloys display a marked improvement in mechanical
properties, especially when tempered.
a fresh, pure aluminium film serves as a good reflector
(approx. 92%) of visible light and an excellent reflector (as
much as 98%) of medium and far infrared.
ALUMINIUM
Alloys
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Aluminium readily forms alloys with
many elements such as copper, zinc,
magnesium and silicon.
Almost all bulk metal materials that
are referred to as aluminium are
actually alloys.
For example, the common aluminium
foils are alloys of 92% to 99%
aluminium.
ALUMINIUM
Uses
Transportation:
• Automobiles, aircraft and bicycles.
Construction:
• Windows, doors, siding, building
wire, etc.
Aluminium is widely used in watch
production as it provides durability
and resists tarnishing and corrosion.
Packaging:
• Cans, foils, etc.
ALUMINIUM
Thermal Resistance
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The thermal resistance for aluminium
frames is poor.
Modern aluminium window frames
typically consist of two surfaces
separated by a thermal break made of
an insulating spacer material.
While this can double thermal
resistance, it is still less than half that
of other frames.
ALUMINIUM
Stability / Durability
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Compared to wood, vinyl or
PVC, aluminium is superior
alongside fibreglass.
Metal window frames
durability depends on the
geographic location, eg, in
coastal areas the effect of
Potassium nitrate form the
salt will quickly damage
aluminium.
ALUMINIUM
Advantages
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Is durable
Requires minimal maintenance
Is fire-resistant
Is recyclable
Can be very cost-effective
It resists rot
It resists bugs
Doesn’t rust
Strong in compression and tension
ALUMINIUM
Disadvantages
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Poor insulation qualities
Is a non-renewable resource
More expensive than PVCu
More difficult to source