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<p><font size="+1"><font face="Gill Sans MT">Again, I tap the
expertise of this list. <br>
</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">I've read ++articles on
venting vs not venting a roof. This is my situation:</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">Shed roof. High side
is pretty much south facing; low side is north facing.</font></font><font
size="+1"><font face="Gill Sans MT"> Pitch is 4/12. Roof is
standing seam steel, light grey in colour, on strapping over
ply. House is Durisol, 1940sq ft.<br>
</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">18" truss depth at the
minimum.</font></font><font size="+1"><font face="Gill Sans
MT"> There is a cross member at the high side of the truss
approx 2 feet down as well (giving me a 9ft ceiling on the
south side of the upper level. <br>
</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">Climate is standard
mid-Ontario (e.g. cold climate). </font></font><font
size="+1"><font face="Gill Sans MT">We often have extreme NW
winds (off the lake) that will hit the low side of the roof. </font></font><font
size="+1"><font face="Gill Sans MT">Haven't seen Toto or Mary
Poppins fly by yet, but would not be surprised if one or both
did at some point.</font></font><font size="+1"><font
face="Gill Sans MT"> We get lake effect rain, snow and wind. </font></font><font
size="+1"><font face="Gill Sans MT">When it rains, the rain
usually pelts from the N-NW. </font></font><font size="+1"><font
face="Gill Sans MT"> </font></font><font size="+1"><font
face="Gill Sans MT"> </font></font></p>
<p><font size="+1"><font face="Gill Sans MT">I can take extreme care
to seal the living envelope to minimize air leakage to the
roof, but am uncertain as to whether or not to vent the roof.
I have thought of the following:</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">2" closed cell foam
under trusses/underside of roof decking, then balance of cavity
with cellulose, using blocking or batts to prevent settling at
the low end. This should give me an R65 at the min. depth,
more in the dropped areas in the upper bedrooms.</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">Amy advice on this is
much appreciated.</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">Lynelle<br>
</font></font></p>
<p><font size="+1"><font face="Gill Sans MT"></font></font><br>
</p>
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