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Stainless steel has the virtue of being about 1/4 as thermally
conductive as steel. Using Stainless 3/16" diam 4.76 m dia wire
ties @ 600 mm centers results in rather small losses in R-value even
for R20 or so continuous insulation. If the wire ties are used to
connect brick to a wood framework, (eg a 2x6 wood frame wall with 6"
of Rockwool outboard and filled with batt) the effect of such ties
drops to the range of a 2 or 3%, about the same as #10 screws
through strapping over insulation. <br>
Big slabs of steel ties back to steel studs can be a disaster of
course, but I have never seen the 40% claimed loss in any case I
looked at.<br>
<br>
Carbon-fiber ties are disliked by authorities because they tend to
fail early in a fire, allowing brick veneers to fall onto
firefighters. Seems we could solve this, but I have not seen the
real need with careful SS ties design.<br>
<br>
Dr John Straube, P.Eng.<br>
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a><br>
<br>
<br>
On 12-01-29 1:02 PM, RT wrote:<br>
<span style="white-space: pre;">> On Sun, 29 Jan 2012 12:25:58
-0500, John Daglish<br>
> <a class="moz-txt-link-rfc2396E" href="mailto:johndaglish@free.fr"><johndaglish@free.fr></a> wrote:<br>
> <br>
>>
<a class="moz-txt-link-freetext" href="http://ukpassivhausconference.org.uk/sites/default/files/Bill%20Butcher%20and%20Alan%20Clarke%20Presentation.ppt%20%5BCompatibility%20Mode%5D.pdf">http://ukpassivhausconference.org.uk/sites/default/files/Bill%20Butcher%20and%20Alan%20Clarke%20Presentation.ppt%20%5BCompatibility%20Mode%5D.pdf</a><br>
>><br>
><br>
><br>
><br>
>> </span><br>
Merci pour ça, John.<br>
<span style="white-space: pre;">> <br>
> I haven't yet taken the time to read the above file but I did
have a<br>
> quick look at some of the pictures.<br>
> <br>
> One of the things that caught my eye was the seeming
preference for<br>
> masonry construction.<br>
> <br>
> Obviously, the metal ties (pages 15 & 23) between the
masonry wythes<br>
> represent thermal bridges and perhaps not so obviously, are
highly<br>
> susceptible to corrosion and eventual failure.<br>
> <br>
> Have alternatives for ties using non-conductive materials (ie
Fibre<br>
> Reinforced Polymer Composites (FRPC) been utilised in other<br>
> PassivHaus buildings ?<br>
> <br>
> </span><br>
<br>
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