Jackson St Re Roof

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<bR> <div> </div> </td> </tr><tr> <td valign="top" height=420 colspan=2 BGCOLOR="#CCCCCC" TEXT="#080000"> <div> <B>ReRoofing of Office Building  </B><FONT SIZE="2" COLOR="#FF0000" FACE="Arial" ><B>Posted 09.03.04</B></FONT><B>               </B><FONT SIZE="1" COLOR="#000000" FACE="Arial" ><B> </B></FONT><FONT SIZE="1" COLOR="#FF0000" FACE="Arial" >hover your mouse curser over the photo for the text</FONT></div> <bR> <div> This early 1960's Office Building  originally had a Mastic Asphalt roof  25mm thick laid over a lightweight pumice based screed on concrete.</div> <div> During refurbishment in the mid 1970's a second layer of mastic asphalt 12mm thick was overlaid to extend the life of the roof..</div> <div> During the ensuing 30 years very little maintenance was carried out until 1998 and due to thermal expansion and contraction the 2nd layer gradually failed and water became trapped between the 2 layers, causing major blistering.</div> <div> A 3rd overlay was not possible or recommended as the trapped moisture could not be removed.</div> <div> The only solution was to remove the 2nd layer and repair the original roof, before applying a new torchon membrane.</div> <div> The building was fully occupied during the re roofing and the work carried out during the wettest local summer in  recorded weather history.</div> <div> <IMG SRC="264222da0.jpg" border=0 width="290" height="218" ALT="The 2nd layer of mastic asphalt , west wing" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264322da0.jpg" border=0 width="290" height="218" ALT="The 2nd layer of mastic asphalt , centre" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264522da0.jpg" border=0 width="290" height="218" ALT="The 2nd layer of mastic asphalt , east wing" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264422da0.jpg" border=0 width="290" height="218" ALT="An example of the thermal expansion and contraction of the 2nd layer of mastic asphalt" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264722da0.jpg" border=0 width="290" height="218" ALT="An example of the trapped moisture causing blistering between the 1st and 2nd layers" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264622da0.jpg" border=0 width="290" height="218" ALT="An example of thermal movement and trapped moisture combined" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264922da0.jpg" border=0 width="290" height="218" ALT="The second layer is removed" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264822da0.jpg" border=0 width="290" height="218" ALT="Removing the 2nd layer, some parts were fully bonded, at the bay laps" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264b22da0.jpg" border=0 width="290" height="218" ALT="Craning the materials to the rooftop" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264a22da0.jpg" border=0 width="290" height="218" ALT="The disposal chute for the debris at the rear of the building" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264d22da0.jpg" border=0 width="290" height="218" ALT="Warming up and removing the fully bonded strip areas" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264c22da0.jpg" border=0 width="290" height="218" ALT="Warming up and removing the fully bonded strip areas" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="264f22da0.jpg" border=0 width="290" height="218" ALT="The first area prepared, primed with bitumen pimer and ready for torchon membrane" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="264e22da0.jpg" border=0 width="290" height="218" ALT="some badly wrinkled areas had to be flushed off with a cold mastic plaster compound to level out the area" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="265122da0.jpg" border=0 width="290" height="218" ALT="Just one of the many wet and windy days during the work" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="265022da0.jpg" border=0 width="290" height="218" ALT="Applying the 4mm thick SBS Torchon membrane, in this area over a perforated vent sheet to allow the escape of any residual moisture from the mastic plaster skim over" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="265322da0.jpg" border=0 width="290" height="218" ALT="A view of the centre roof area with the new Torchon membrane" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="265222da0.jpg" border=0 width="290" height="218" ALT="A view of the west wing roof area with the new Torchon membrane" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="265522da0.jpg" border=0 width="290" height="218" ALT="One of the pipe penetrations through the roof, this one with a cricket flange to divert surface water around the pipe" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="265422da0.jpg" border=0 width="290" height="218" ALT="A large round chimney vent from the office kitchen below (Vent Hat removed)" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="265722da0.jpg" border=0 width="290" height="218" ALT="The centre roof area and west wing after application of the Bituminous Aluminium Paint coating" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="265622da0.jpg" border=0 width="290" height="218" ALT="The west wing roof area after application of the Bituminous Aluminium Paint coating" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="265922da0.jpg" border=0 width="290" height="218" ALT="This corner hasd some residual moisture trapped in the pumice screed below the original mastic asphalt, so a brether vent has been installed" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"> <IMG SRC="265822da0.jpg" border=0 width="290" height="218" ALT="Another view of the completed roof, here comes the rain again!!!!!!" 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