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<DIV>The challenge of the eave detail can certainly defeat the feasibility of
what I suggested. However, a vapor permeable foam over the roof structure
would create an exceptionally air tight house if the continuity with the wall
can be achieved. Even though inside air is not vented, vapor can pass
though EPS foam and is carried away by air that never was inside the thermal
envelope. </DIV>
<DIV> </DIV>
<DIV>Eli </DIV>
<DIV><A
href="http://www.lightfootdesignbuild.wordpress.com">www.lightfootdesignbuild.wordpress.com</A></DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=sacie.lambertson@gmail.com
href="mailto:sacie.lambertson@gmail.com">Sacie Lambertson</A> </DIV>
<DIV><B>Sent:</B> Saturday, September 10, 2016 2:13 PM</DIV>
<DIV><B>To:</B> <A title=greenbuilding@lists.bioenergylists.org
href="mailto:greenbuilding@lists.bioenergylists.org">Green Building</A> </DIV>
<DIV><B>Subject:</B> Re: [Greenbuilding] innovative solution
sought</DIV></DIV></DIV>
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<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">In response to my
query looking for innovative inexpensive ways to extend old 2x4 rafters to allow
for about 8" of dense pack cellulose, I've received a number of responses.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">Included is the
suggestion we rebuild the roof by placing more insulation on top and make it
vented. Am afraid this is a non starter because we don't want to have to
rebuild the existing soffits AND vented roofs are not a good idea in an
otherwise tightly built house. Also rec. the suggestion we sister/scab
wider wood onto the 2x4s, which is exactly what I want to avoid.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">OTOH scabbing cheap
plywood onto the rafters is a good idea. We wouldn't have to do this for
every rafter nor for the full length. Maybe we could install cables across
the scabbing to hold the netting in place after it the dense pack cellulose has
been blown in.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">Welcome further
comments/ideas.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">Sacie</DIV></DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV class=gmail_quote>On Fri, Sep 9, 2016 at 11:32 AM, Nick Pyner <SPAN
dir=ltr><<A href="mailto:npyner@ihug.com.au"
target=_blank>npyner@ihug.com.au</A>></SPAN> wrote:<BR>
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style="PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex">
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<P>Cheap plywood shot to the side of the rafters? <BR></P>
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<DIV class=h5>
<DIV> </DIV>
<DIV>On 10/09/2016 12:59 AM, Sacie Lambertson wrote:<BR></DIV></DIV></DIV>
<BLOCKQUOTE type="cite">
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<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">All, We have an
old house in which we want a well insulated unvented attic. We are
replacing the existing roof (with metal) and installing a minimal layer of
XPS on top of the sheathing. We plan to use closed cell spray underneath
followed by dense pack cellulose between the rafters. The problem is
the rafters, which are only 2x4s in this old house. I am looking for a
creative least expensive way to provide more rafter depth for the
insulation. </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">(We do not want to
build up the insulation on the top of the roof sheathing because doing
so requires the added cost of completely rebuilding the existing soffits,
which are in good condition). </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">Will appreciate
all your useful suggestions.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">Sacie</DIV></DIV><BR>
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