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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi Janne,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>For energy modeling purposes, as long as your exterior/underground walls and slabs are built up from constructions and layers and exceed the minimum performance of the assembly U-value (read as lower assembly U-value), you should be in good shape. From a building inspection standpoint, I don’t know whether the 2.5” of R-5 extruded polystyrene is in compliance or not.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>John T. Forester, P.E., LEED AP, Mechanical Design Engineer </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I BVH Integrated Services I</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>617.658.9008 tel </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>617.244.3753 fax</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'> </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>One Gateway Center Suite 506, Newton MA 02458 </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0000A0'>I <a href="http://www.bvhis.com">www.bvhis.com</a> I Hartford ● New Haven ● Boston</span></b><span style='font-size:10.0pt;color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Janne Kairento<br><b>Sent:</b> Wednesday, December 15, 2010 3:15 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Massachusetts Energy Code<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For Climate Zone 5, IECC requires a minimum insulation value of R-13 + R-7.5 c.i. for a steel framed building. If the studs are 16” on center, the thermal bridging degrades the batt R-value of 13 down to an effective R-6 c.i. which bring the total insulation value to R-13.5 c.i. Currently, I am reviewing a building with 2.5” of R-5 extruded polystyrene total an insulation value of R-12.5 c.i. However, the building wall assembly exceeds the ‘Assembly Minimum’ of U-value 0.064. Since IECC 2009 is the effective energy code of Massachusetts since June 30, 2010, is the insulation assembly in agreement with the Minimum Envelope Requirements if the ‘Assembly Maximum’ is exceeded? Any input will be much appreciated!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Janne Kairento</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>