Week  8    Section  Detail  15  of  the  Ormond  Theology  Centre  building  

       

           

   

 

This  detail  highlights  a  section  of  wall  that  includes  concrete  flooring  on  one  side  and  a  glass  roof  on  the  other.  One  of  the  more  interesting  elements  of  this  detail  is  the  connection  between  the  glass  roof  and  the  blockwork  wall  seen  in  the  one  to  one  drawing  to  the  left.  An  aluminium  glazing  adaptor  has  been  used,  which  is  helpful  when  the  width  requirements  of  the  roof  need  the  structural  addition  of  large  spanning  members  that  are  separate  to  the  glazing  suite.  The  adaptor  and  the  roof  both  sit  on  an  aluminium  mullion,  which  also  acts  as  a  structural  member,  and  works  to  carry  the  dead  load  of  the  roof  to  the  building  structure.  Above  these  elements  there  is  folded  Colorbond  overflashing,  which  runs  from  underneath  the  blockwork  wall  and  over  the  regular  folded  metal  flashing  to  give  extra  protection  from  the  effects  of  rainfall,  with  the  flashing  then  returning  up  at  the  end  to  form  a  drip  edge  as  seen  in  the  diagram  below  left.    Also  present  on  the  backside  of  the  blockwork  wall  is  sarking.  This  is  a  layer  of  reflective  foil  laminate  that  is  both  an  additional  barrier  to  moisture,  whilst  also  acting  as  a  radiative  and  convective  insulation  (Timber  Building  in  Australia  2013).  The  other  main  structural  element  of  this  detail  is  obviously  the  concrete  floor  slab,  which  helps  to  hold  the  blockwork  wall  in  place  via  wall  ties.  

Stramit  Roof  &  Wall  Flashing:  Architectural  detailing,  viewed  27  September  2013,  at  <  http://www.roofingwarehouse.com.au/images/Roof%20and%20Wall%20Flashing%20Guide.pdf>  

 Reference    Hammond,  G.P.  and  C.I.  Jones,  2008,  'Embodied  energy  and  carbon  in  construction  materials',  Proc.  Viewed  27  September  2013,  Instn  Civil.  Engrs:  Energy,  in  press.  

Timber  building  in  Australia,  2013,  viewed  27  September  2013  at  <http://oak.arch.utas.edu.au/tbia/about.asp>  

In  terms  of  sustainability,  there  are  pros  and  cons  to  the  materials  that  have  been  used.  Concrete  blockwork  has  relatively  low  embodied  energy  with  only  0.67MJ  per  kg,  and  0.073kg  of  CO2  per  kg.  The  concrete  floor  slab  has  slightly  higher  levels  of  both,  with  1.11MJ  energy  per  kg  and  0.159kg  CO2  per  kg,  however  concrete  posses  large thermal mass so is able to store energy and release it later. It can also be recycled however cannot be used again for structural elements. Aluminium such as is used for the mullion and glazing adaptor has extremely high embodied energy and carbon footprint at 155MJ energy per kg and 8.24kg CO2 per kg, however is highly recyclable and so most aluminium that is used today is either part or completely made of recycled material. The flashing is made of steel, which has relatively high embodied energy at 20.1MJ energy per kg and 1.37kg CO2 per kg, but again has reasonably strong recyclability potential (Hammond & Jones 2008).