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<p class=MsoNormal><span lang=EN-US>Hello,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>we were asked to check the requirements for
LEED NC EA P2 “Minimal Energy performance” for a building in Berlin, Germany. The
requirement 5.5.4.2.1 “Vertical Fenestration Area” of the ASHRAE 90.1 code says
that the total vertical fenestration area shall be less than 50% of the gross
wall area, section 5.2.1 even says that 50% vertical fenestration area shall
not be exceeded for each space conditioning category.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Although we are aware that smaller windows
are better for the buildings energy balance, this “simple” requirement was much
discussed between us, as it would easily disqualify many modern buildings to
comply with LEED requirements and even with the ASHRAE Standard. ASHRAE alone
would allow using the trade-off path, however LEED requirements (Version NC 2.2)
demand compliance with section 5.5 of the ASHRAE Standard alone and does not
allow the trade-off option to be used.- Do I read the code correctly, or is
there a way to achieve LEED certification for buildings with a fenestration
area larger than 50%? <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Best Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Dirk Schwede <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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