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<p>Greetings,</p>
<p>I assumed so, given the code you are using. The point of 90° and
70%RH was that is likely the greatest amount of moisture that
could have been included, if building in the peak of summer. If
you have gotten more leakage than that out, it can NOT be latent
moisture under any circumstances.</p>
<p>Thank you kindly,</p>
<p>Topher Belknap<br>
</p>
<pre class="moz-signature" cols="72">--
Topher Belknap
Green Fret Consulting
<a class="moz-txt-link-freetext" href="http://www.greenfret.com/">http://www.greenfret.com/</a>
(207) 882-7652</pre>
<div class="moz-cite-prefix">On 1/8/2024 8:42 PM, Lynelle Hamilton
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:f1171ef6-d0ee-4dfc-a79e-92129043b3fa@lahamilton.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Thanks, Topher. I should have added that I am in Bracebridge
Ontario, definitely a colder climate zone (45th parallel)<br>
</p>
<div class="moz-cite-prefix">On 2024-01-08 8:31 p.m., Topher
Belknap wrote:<br>
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<blockquote type="cite"
cite="mid:e791307a-a9c3-4693-9425-14e1ea3bfe13@greenfret.com">
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:
</th>
<td>Re: [Greenbuilding] ***SPAM*** Steel Roof Question</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date:
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<td>Mon, 8 Jan 2024 20:30:54 -0500</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From:
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<td>Topher Belknap <a class="moz-txt-link-rfc2396E"
href="mailto:topher@greenfret.com"
moz-do-not-send="true"><topher@greenfret.com></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To:
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<td>Lynelle Hamilton <a class="moz-txt-link-rfc2396E"
href="mailto:lynelle@lahamilton.com"
moz-do-not-send="true"><lynelle@lahamilton.com></a></td>
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<br>
<br>
Greetings,<br>
<br>
If the latent moisture is hermetically sealed into the space,
it would not be able to leak out. If not, more moisture could
of course enter.<br>
<br>
Let's consider a sealed volume (which this is apparently not),
16' x 47' x 1' = 750 ft^3. At 90°F and 70% relative humidity,
equals 52 pounds of dry air, and 6200 grains of water, about
0.8 pounds (0.8 pints).<br>
<br>
Thank you kindly,<br>
<br>
Topher Belknap<br>
<br>
<pre class="moz-signature">--
Topher Belknap
Green Fret Consulting
<a class="moz-txt-link-freetext" href="http://www.greenfret.com/"
moz-do-not-send="true">http://www.greenfret.com/</a>
(207) 882-7652
On 1/8/2024 9:50 AM, Lynelle Hamilton wrote:
</pre>
<blockquote type="cite">Hope y'all are still out here!<br>
<br>
I have contracted with someone for an addition to my home.
The addition has a second story with a cathedral roof. The
contractor insisted that I did not need decking and
ice/water dam on the rafters, so installed the purloines
directly on them, then installed the steel roof. I have
installed 3 steel roofs, but never one this way, so
questioned it. He insists it's the correct method.<br>
<br>
To meet the Ontario Building code, he said we had to lay 2
layers of R14 insulation, then install foil-covered foam
board (foil both sides)on the inner side, seal and tape. I
used Rockwook, plus RKO 3/4" board as per his specs. We have
not yet installed drywall.<br>
<br>
There are at least 10 areas of trapped moisture in a 16x47
foot area. One is dripping onto the first floor<br>
<br>
We pulled the insulation from one area and found significant
condensation on the cold steel roof, seeping through the
Rockwool and running down the cold side of the foil covered
foam board. The contractor says this is due to latent
moisture in the insulation and that we've got propane heat
in the basement. He says it will resolve in time. I don't
buy this.<br>
<br>
Any advice is appreciated.<br>
<br>
Lynelle Hamilton<br>
<br>
<br>
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