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<p>Hi Ben, <br>
</p>
<p>Two things. </p>
<p>I have 4 heat pumps that provide zoned forced air heat. I love
them. Propane in Ontario is very expensive and the rates somewhat
volatile. Electricity somewhat less so. Heat loss for the house is
calculated at 44K BTU, and the 4 heat pumps total 36KBTU. No
problems and the systems aren't running past peak efficiency. I
do have a wood stove that I use on really cold days to offset the
load, but that's on -30C and relatively rare. <br>
</p>
<p>I have a steel roof with no decking (soon to be installed vapour
barrier between insulation and steel--builder's error and fixed at
his cost). when I looked at it, CCF was an option for a steel
roof, but the risk of rust is still present. I'd do Rockwool.</p>
<p>Glad this list is still going!</p>
<p>Lynelle<br>
</p>
<div class="moz-cite-prefix">On 2024-02-18 1:33 p.m., Mike O'Brien
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5B2BEE1D-FA0F-4E7A-B085-E19985520CD8@hevanet.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hi, Ben—
<div><br>
</div>
<div>Our house plans specified closed-cell foam in our roof, but
without asking, our general contractor installed open cell foam.
Now, 16 years later, there is rot in the roof sheathing and a
very expensive repair job ahead. So I would caution against ever
specifying either foam, as a mistake can be catastrophic years
later.</div>
<div><br id="lineBreakAtBeginningOfSignature">
<div dir="ltr">Best, Mike O’Brien
<div>Sent from my iPhone</div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb 18, 2024, at 8:13 AM, Benjamin
Pratt <a class="moz-txt-link-rfc2396E" href="mailto:benjamin.g.pratt@gmail.com"><benjamin.g.pratt@gmail.com></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div>Hi. I've been on this forum for many years, but I am
not an architect or qualified expert. I came across
this article today and had some concerns about this
project. <br>
</div>
1. By air source heat pump, I assume they mean
mini-split(s). I did some calculations rencenty and found
that electricity is about 9 times more expensive per therm
than gas. Combining with the very cold temperatures we
typically get, I imagine The bill will be higher than if
they had a gas boiler. Also, they now have to deal with
uneven temperatures throughout the house and leaving doors
open to all the rooms they want heated. What do you
think?<br>
<div>2. I have read about dangers of using spray foam in
an old house--especially the potential for rot. What do
you think?</div>
<div> <br>
This article reads as an advertisement for doing this
sort of remodel without mentioning any of the potential
downsides. I'd love to hear your thoughts.<br>
</div>
<div><a
href="https://www.mprnews.org/story/2024/02/18/renovating-old-1909-st-paul-house-into-all-electric-green-home"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.mprnews.org/story/2024/02/18/renovating-old-1909-st-paul-house-into-all-electric-green-home</a><br>
<br>
</div>
<div>Ben Pratt<br>
</div>
<div>
<div><br>
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