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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Very difficult to take such claims seriously: “not worth it” depends entirely on the cost of the doing “it” and what “it” gets
you. Too many practical and economic variables to be able to make such a statement.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Adding insulation between the framing will be massively impacted by thermal bridging. You will have a hard time getting airtightness
to the same level as from the exterior. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">But, if you are willing to live with an equivalent R10 wall (after all the thermal bridging at studs partions and floors) and an
airtightness probably in the 2-5 ACG@50 range, then ripping apart the entire interior is the cost.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Removing the exterior siding is also a lot of disruption but the disruption is outdoors. Good design will allow you to get exceptional
airtightness, adding just 2” of insulation will get you the same R-10, and you will be able to improve water control so that the house framing lasts a very long time. Add 4” of, say, rockwool/EPS and you get R20, real R-value (nothing in the studspace) or
drill holes in exterior sheathing, blow in cellulose, add 4” of rockwool/ EPS and you are now close to real R-30.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">With the reliable and high airtightness, and the uniform high R-value you can now heat or cool this place with small and simple
HVAC, and not have to think about upgrading again for another long time…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">In my experience, the performance of the between studs retrofits is always significant less than an exterior wrap, and the difference
matters to occupant comfort and energy use in a very noticeable way.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I guess, though, I am just another design professional in my young 40’s
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US">John<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Lucida Sans",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org]
<b>On Behalf Of </b>Sacie Lambertson<br>
<b>Sent:</b> March 16, 2016 21:43<br>
<b>To:</b> Greenbuilding <Greenbuilding@lists.bioenergylists.org><br>
<b>Subject:</b> [Greenbuilding] best practice<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">A good guy and relatively young architect (in his 40s, 'young' by my standards), tells me it is not worth taking off the siding of an old 1883 house to add insulation and an air space to the
outside. He says the added expense is not worth the additional insulation. That the extra R-value above R 23 in walls is thermodynamically not money well spent as long as the house is very tightly constructed in the retro-fit.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">The siding is original and in very good shape. The interior has full dimensioned 2x4 walls. The rooms are too small for me to want to build a double wall on the interior.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">What he suggests I do is simply used closed cell foam between the wall framing.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">I would appreciate your comments please.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Sacie<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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