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<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13pt"><SPAN
style="FONT-FAMILY: ; LINE-HEIGHT: 18pt"><FONT face="Times New Roman"><FONT
style="FONT-SIZE: 16pt">I am interested in bonding a veneer grade plywood to a 4
to 6 inch thick panel of EPS foam that could be set to the interior of building
framing to achieve a continuous thermal barrier.<SPAN
style="mso-spacerun: yes"> </SPAN>I am wanting the beauty of the wood to
replace the need for conventional sheetrock so this can be the finished
surface.<SPAN style="mso-spacerun: yes"> </SPAN>I think that the thickness
of the foam bonded to the plywood makes both more rigid and able to take some
loading.<SPAN style="mso-spacerun: yes"> </SPAN>Although, unlike SIPs I
want the main structure to be separate from the insulation (thermal barrier).
<SPAN style="mso-spacerun: yes"> </SPAN>I am wondering if using low
investment methods such as spreading foam appropriate panel adhesive over eps
foam laid flat would achieve adequate bonding.<SPAN
style="mso-spacerun: yes"> </SPAN>I am also wondering if humidity is a
factor in bonding and or dimensional stability.<SPAN
style="mso-spacerun: yes"> </SPAN>I would seal the seams. The seams would
be covered with a finish grade wood strip. </FONT></FONT></SPAN></P>
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style="FONT-FAMILY: ; LINE-HEIGHT: 18pt"><SPAN style="mso-spacerun: yes"><FONT
face="Times New Roman"><FONT
style="FONT-SIZE: 16pt"></FONT></FONT></SPAN></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13pt"><SPAN
style="FONT-FAMILY: ; LINE-HEIGHT: 18pt"><FONT face="Times New Roman"><FONT
style="FONT-SIZE: 16pt">If I had the structural sheathing (osb or plywood) to
the interior side of conventional wood framing, siding could be mounted directly
onto the framing to allow for drafting in the cavity which can serve as the
drain dry plain that is needed if we are not drafting heated air through the
wall. </FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13pt"><SPAN
style="FONT-FAMILY: ; LINE-HEIGHT: 18pt"><FONT face="Times New Roman"><FONT
style="FONT-SIZE: 16pt"></FONT></FONT></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13pt"><SPAN
style="FONT-FAMILY: ; LINE-HEIGHT: 18pt"><FONT face="Times New Roman"><FONT
style="FONT-SIZE: 16pt">The intention is to set these panels on the floor
framing to be primarily self supporting avoiding the need for the long fasteners
that drive up cost and likely reduce thermal performance.<SPAN
style="mso-spacerun: yes"> </SPAN>In some cases, I would use the flat
ceiling for the top of the thermal barrier.<SPAN
style="mso-spacerun: yes"> </SPAN>I was interested in installing some
exposed ceiling rafters that would be supported by a ledger mounted to the wall
foam-plywood panels.<SPAN style="mso-spacerun: yes"> </SPAN>I would set
veneer plywood above and support thick layer of foam.<SPAN
style="mso-spacerun: yes"> </SPAN>The loads would be only the rafters,
foam and the plywood.<SPAN style="mso-spacerun: yes"> </SPAN>Live load and
dead loads from the main roof are carried by conventional wood trusses.<SPAN
style="mso-spacerun: yes"> </SPAN>These ceiling rafters wedge the wall
paneling in place.<SPAN style="mso-spacerun: yes"> </SPAN>This ceiling
assembly can be set in place without bonding.<SPAN
style="mso-spacerun: yes"> </SPAN>This also avoids the long
fasteners.</FONT><SPAN style="mso-spacerun: yes"><FONT
style="FONT-SIZE: 16pt"> I would top off the ceiling foam from the attic
side with fire retarded cellulose to serve as the 15 minute fire barrier
required by code. </FONT></SPAN></FONT></SPAN></P>
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