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<p>Hi Lars,</p>
<p>We've used two different approaches, and both have worked well. <br>
</p>
<p>If we're trying to stay in the realm of all natural materials, we
have used hempcrete to insulate and seal the gap between window
and whatever other material it's set in. We use a mix with a finer
grind of hemp than for insulating walls/roofs, and we up the
binder content a bit too. Ideally, we actually use the hempcrete
to also form a trim detail on the interior and exterior of the
wall too, and this provides a really good seal, looks good, and
takes care of several steps with one process.</p>
<p>We also use the tapes from ProClima or Siga. Both make excellent
products that are meant for sealing windows to any other material,
and come with split back peels to make it really easy to do a good
job. If we're using tape, we will typically tape one side, stuff
with wool insulation, then tape the other side. Both companies
make tapes that are meant for plastering onto, so if the plaster
is finishing right to the window these tapes work really well as
we don't have to add mesh.</p>
<p>We've been able to hit Passive House air tightness targets with
both these methods.</p>
<p>Happy sealing!</p>
<p>Chris<br>
</p>
<br>
<div class="moz-cite-prefix">On 2018-06-28 12:30 AM, Lars Keller
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKaOCAc-EaRdtbePqSV_1_+Sf1ichoniyRTy+1Kz0+0A9HO2dg@mail.gmail.com">
<div>
<div dir="auto">
<div dir="auto">
<div dir="auto">Hi Derek,</div>
</div>
<div dir="auto">Yes, it is based on the heated floor area.
Tested at 50 pascal over- and underpressure, and then an
average hereof.</div>
<div dir="auto">The test conditions are defined by <span
style="color:rgb(103,103,103);font-family:opensans;font-size:13.008000373840332px;text-align:justify;background-color:rgb(255,255,255)">EN
13829 Thermal performance of building - Determination of
air permeability of buildings - Fan pressurization method
(ISO 9972:1996, modified) - This standard is intended for
the measurement of the air permeability of buildings or
parts of buildings in the field. It specifies the use of
mechanical pressurization or depressurization of a
building or part of a building. It describes the
measurement of the resulting air flow rates over a range
of indoor-outdoor static pressure differences. This
standard is intended for the measurement of the air
leakage of building envelopes of single-zone buildings.</span></div>
<div dir="auto">
<div class="gmail_quote" style="width:1080px">
<div dir="ltr"><br>
</div>
<div dir="ltr">Yes, it is exactly the areas you mention
that most often cause the leaks here in Denmark as well.</div>
<div dir="ltr">What I mentioned was the traditional method
to seal the joint between a wooden frame window and a
brick wall in Denmark before modern big scale building
systems arose from around maybe the 1950ies.</div>
<div dir="ltr">As far as I understand, the big building
segments proved to have expansion rates which the
traditional mortar method could not deal with, and thus
“plastic” sealants where developed.</div>
<div dir="ltr">And what is happening today is what we know
so well: due to speed, lack of knowledge, advertising
etc the “modern” sealing method has taken over.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">What I am wondering is, if anyone know of
modern sustainable products for sealing the joint
between the window and the wall, be that wood or brick
or straw...</div>
<div dir="ltr">Best, Lars</div>
</div>
</div>
</div>
</div>
-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">-- <br>
Small Planet<br>
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Kontakt-info<br>
skype<br>
jomorandin<br>
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<a href="mailto:larskeller@gmail.com" moz-do-not-send="true">larskeller@gmail.com</a><br>
<br>
Home +45 8668 0505<br>
Jo +45 2390 0924 (mobile/handy)<br>
Lars +45 2024 0505 (mobile/handy)<br>
<br>
Jo Morandin, Jamilla, Asger & Lars Keller<br>
Friland 12 B<br>
8410 Rønde<br>
Danmark<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Chris Magwood
Director, Endeavour Centre
<a class="moz-txt-link-abbreviated" href="http://www.endeavourcentre.org">www.endeavourcentre.org</a></pre>
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