<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi, again-<div class=""><br class=""></div><div class="">Here’s a list of products with tested reflectance and emissivity:</div><div class=""><br class=""></div><div class=""><a href="http://coolroofs.org/products/results" class="">http://coolroofs.org/products/results</a></div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">Mike</div><div class=""><br class=""><div><div class="">On Nov 26, 2016, at 10:00 AM, Reuben Deumling <<a href="mailto:9watts@gmail.com" class="">9watts@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Helvetica-Light; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div class="gmail_extra"><br class="Apple-interchange-newline"><br class=""><div class="gmail_quote">On Sat, Nov 26, 2016 at 9:42 AM, Michael O'Brien<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:obrien@hevanet.com" target="_blank" class="">obrien@hevanet.com</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div dir="auto" class=""><div class="">Hi, Reuben--</div><div id="gmail-m_7113498976693558370AppleMailSignature" class=""><br class=""></div><div id="gmail-m_7113498976693558370AppleMailSignature" class="">I think some metal roofing has high reflectance and emissivity, would reduce the heat in the attic. I wonder if a foil sheet stapled to the bottom of the rafters would add more reflectance,<span class="Apple-converted-space"> </span></div></div></blockquote><div class="">When you say 'bottom of rafters' can you explain? Are you saying staple the foil sheet to the inside faces of the purlins - which would then touch the back side of the drywall?<span class="Apple-converted-space"> </span><br class=""></div><div class=""> </div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div dir="auto" class=""><div id="gmail-m_7113498976693558370AppleMailSignature" class="">not sure of your configuration.<br class=""></div></div></blockquote><div class="">standing seam painted metal roof -> tar paper -> 5/8 plywood -> 2x6 rafters +insulation batt -> 2x4 purlins (horizontal)+insulation batt -> sheet rock -> prime+ paint<span class="Apple-converted-space"> </span><br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div dir="auto" class=""><div id="gmail-m_7113498976693558370AppleMailSignature" class=""><br class="">Best, Mike<div class="">Sent from my iPhone</div></div><div class=""><div class="gmail-h5"><div class=""><br class="">On Nov 26, 2016, at 7:20 AM, Reuben Deumling <<a href="mailto:9watts@gmail.com" target="_blank" class="">9watts@gmail.com</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class=""><div dir="ltr" class="">Thanks for your reply, Topher, and good to hear from you. This list is not quite what it once was... Have folks drifted elsewhere, and if so I wonder where those places might be?<br class=""><br class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sat, Nov 26, 2016 at 7:03 AM, Topher Belknap<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:topher@greenfret.com" target="_blank" class="">topher@greenfret.com</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><br class="">Greetings,<br class=""><br class="">Thermal losses should be considered on the basis of surface area, not<br class="">volume. <span class="Apple-converted-space"> </span></blockquote><div class="">Agreed.<br class=""> <br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">Heat stratification (for good or ill) is pretty insignificant in a modern, well insulated and sealed house. <span class="Apple-converted-space"> </span></blockquote><div class="">I've noticed this myself and tried to discuss this with the heating man who came to advise/make a bid for the additional duct work to the new upstairs rooms), but I don't think I was able to persuade him.<span class="Apple-converted-space"> </span><br class=""> <br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">Venting ought to be the same for either option (if I am envisioning correctly). Since it should<br class="">run up the outer surface, not the interior. <span class="Apple-converted-space"> </span></blockquote><div class="">I am aware that standard practice has me installing vent channels between the insulation-in-the-rafter-bays and the sheathing, that connect vents at the bottom to ridge vents--we've discussed this here over the years--but I also think I remember folks arguing that in certain situations one could skip those channels. Am I misremembering this or just experiencing wishful thinking? I confess that getting the venting right seems to me the biggest challenge at the moment.<span class="Apple-converted-space"> </span><br class=""></div><div class=""> </div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">My concern would be ensuring that the vapor barrier (if your climate wants one) is put in<br class="">the right place. <span class="Apple-converted-space"> </span></blockquote><div class="">Ah, vapor barriers. I'd love advice on this. There is currently a layer of roofing felt on the outside of the sheathing. The batts of insulation I'm planning on using for the walls and sloped roof sections of the envelope are paper-faced fiberglass. I was going to rip the paper off the batts that run vertical and keep it on the inner layer that runs horizontal. Is that a viable approach?<br class=""></div><div class=""> </div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">If you decide on the flat ceiling, fill that space with insulation.<br class=""></blockquote><div class="">I was certainly planning on insulating above the horizontal sheet rock, but are you suggesting filling the entire triangle? <span class="Apple-converted-space"> </span><br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><br class="">Thank you kindly.<br class=""><br class="">Topher<br class=""><br class="">--<br class="">Topher Belknap<br class="">Green Fret Consulting<br class="">Kermit didn't know the half of it...<br class=""><a href="http://www.greenfret.com/" rel="noreferrer" target="_blank" class="">http://www.GreenFret.com/</a><br class=""><br class="">______________________________<wbr class="">_________________<br class="">Greenbuilding mailing list<br class="">to Send a Message to the list, use the email address<br class=""><a href="mailto:Greenbuilding@bioenergylists.org" target="_blank" class="">Greenbuilding@bioenergylists.o<wbr class="">rg</a><br class=""><br class="">to UNSUBSCRIBE or Change your List Settings use the web page<br class=""><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org" rel="noreferrer" target="_blank" class="">http://lists.bioenergylists.or<wbr class="">g/mailman/listinfo/greenbuildi<wbr class="">ng_lists.bioenergylists.org</a><br class=""></blockquote></div><br class=""></div></div></div></blockquote><blockquote type="cite" class=""><div class=""><span class="">______________________________<wbr class="">_________________</span><br class=""><span class="">Greenbuilding mailing list</span><br class=""><span class="">to Send a Message to the list, use the email address</span><br class=""><span class=""><a href="mailto:Greenbuilding@bioenergylists.org" target="_blank" class="">Greenbuilding@bioenergylists.<wbr class="">org</a></span><br class=""><span class=""></span><br class=""><span class="">to UNSUBSCRIBE or Change your List Settings use the web page</span><br class=""><span class=""><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org" target="_blank" class="">http://lists.bioenergylists.<wbr class="">org/mailman/listinfo/<wbr class="">greenbuilding_lists.<wbr class="">bioenergylists.org</a></span></div></blockquote></div></div></div><br class="">______________________________<wbr class="">_________________<br class="">Greenbuilding mailing list<br class="">to Send a Message to the list, use the email address<br class=""><a href="mailto:Greenbuilding@bioenergylists.org" class="">Greenbuilding@bioenergylists.<wbr class="">org</a><br class=""><br class="">to UNSUBSCRIBE or Change your List Settings use the web page<br class=""><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org" rel="noreferrer" target="_blank" class="">http://lists.bioenergylists.<wbr class="">org/mailman/listinfo/<wbr class="">greenbuilding_lists.<wbr class="">bioenergylists.org</a><br class=""></blockquote></div><br class=""></div></div><span style="font-family: Helvetica-Light; 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