8/18/2019 Rebuke - Debate 1
2/5
in use phase: timber buildings can be most cost effective in
constructing energy efficient
buildings.
CO2 Emissions from different house constructions
" #$$% &wedish study showed the difference to be
e'uivalent to #( years heating, or driving a)olvo s*$
%3$,$$$km+
CO2 emissions from different wall constructions
nd of life: if the timber cannot be recycled it can be used as a
substitute for fossil fuels,
providing renewable energy. # can be saved using timber
over the whole life cycle.
&ubstituting %m3 of timber for other construction materials
can result in savings of up to % tonne
of # This combined with the carbon storage, means that %m3
of timber stores and substitutes
# tonnes of #
/et # life cycle emissions of construction materials
8/18/2019 Rebuke - Debate 1
4/5
carrying out the practice has improved. Plus there is no need
&or expensive
carbon capturing material2. 'ndividual tree &arms are
becoming common practice around the world!
particularly developing countries. Carmers are turning their
bac% on the
traditional crops and moving to tree &arming. 'n )enya! the
number o&
small #5* &arms planting trees has risen dramatically. The
one acre tree&und designed by the government a9rms &armers
to grow trees. 't also
reduces the Hooding and erosion problems and limits illegal
logging
occurring.*. True! however! the importation o& the
Eucalyptus tree which grows to
maturity ta%es >51+ years;. Timber has higher
structural e9ciency as carried load per unit weight
compared to rein&orced concrete and steel structures. B
common stud
used in house construction has similar compressive strength to
general
purpose concrete. any timbers are either naturally durable or
can be
easily treated to ma%e very durable. Timber used internally
provides a
healthier environment &or occupants as it helps maintain a
better relativehumidity
-. B &alse perception! timber is good in /re! maintain its
structure &ar better
than steel! due the charring e0ect. This charring e0ect can also
be
designed into the timber to enhance its ability under extreme
heat. 0or
e1ample, in a fire, a thick plank of wood will char on the
outside, sealing the
interior and protecting it from damage. 2ood burns slowly at
appro1imately $.$#
inchesminute and the char created on the wood surface as it
burns helps protect
and insulate the unburnt wood below and maintain the structure.
This is because
the build-up of carbon on the surface will limit the o1ygen
supply to the wood
below and act as insulator. Therefore, the wood below the
charred level will be
cool and retain *4 to 5$ per cent of its structural integrity.
6etal, on the other
hand, begins to melt when it reaches a critical temperature
7around %3$$ degrees
8 so will fail catastrophically. 9.. ;eah,
from "!" described steel being owever, concrete is a
comple1 material and its properties can dramatically
change when e1posed to high temperatures. 0or e1ample, while the
compressive
strength of concrete is 'uickly lost beyond e1treme temperatures
7anything above
?$$ degrees 8, much like steel, and the structural effectiveness
isn@t affected
until the bulk of the material reaches the same
temperature.odern /re retardant treatments are also available that
reduce the ris%
&urther still i.e. they help control the rapid spread o&
/re in timberstructures.
http:AAwww.timber=ueensland.com.auADocsAIene/ts,#+o&,#+TimberAicroso&t5
Word5CBT58
8/18/2019 Rebuke - Debate 1
5/5
http:AAwww.nytimes.comA#+1#A1#A+*AscienceAhow5many5pounds5o&5carbon5
dioxide5does5our5&orest5absorb.html
https:AAsourceable.netAtimber5vs5steel5vs5concrete5structuresAJ
http:AAwww.businessdailya&rica.comACarmers5show5money5can5grow5on5
treesA5A1#*>#>A#*1-*A5A12*ci+$A5Aindex.html
http:AAwww.&ao.orgAdocrepAu>;eAu>;e+2.htm
https:AAwww.oneacre&und.orgAblogsAtagAtreesA#;1
http:AAwww.internationaltimber.comAnewsAtimberAhow5does5timber5handle5/re5
compared5to5steel5and5concrete5
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